Vadym Kovalenko; Vadym Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesVadym Kovalenko in OpenAIRE
Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRENail polish, in particular gel nail polish, is the most used cosmetic product. The components of the gel polish, which determine both toxicity and consumer color properties, are pigments. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments for use in gel polish. The parameters of the samples of Orange Yellow S-intercalated Zn-Al (Zn:Al=4:1 and Zn:Al=2:1) hydroxides synthesized at pH=8 and pH=11 were studied. The crystal structure of the samples was studied by X-ray phase analysis and thermogravimetry, and the pigment properties – by the method of measuring and calculating color characteristics in the CIELab and XYZ systems. The color characteristics of gel nail polish samples prepared using synthesized pigments were studied in a similar way. X-ray phase analysis and thermogravimetry showed that Zn-Al-Orange Yellow S pigments synthesized at both Zn:Al ratios and pH were layered double hydroxides with the α-Zn(OH) 2 structure. The phenomenon of the decomposition of Zn-Al LDH to ZnO during the synthesis was revealed. As a result, all Zn-Al-Orange Yellow S pigment samples contained both layered double hydroxide and zinc oxide. It was shown that all samples of the Zn-Al-Orange Yellow S pigment obtained at pH 8 and 11 and the ratios Zn:Al=4:1 and Zn:Al=2:1 had high pigment characteristics and are promising for use in gel polish. The samples of gel nail polish with synthesized pigments have a red-orange color (сolor tone 595–604 nm) with high monochromaticity (color purity 63–75 %) and color saturation (48.7–58.3)
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2020.214847&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu- Vadym Kovalenko;
Vadym Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRENail polish, in particular gel nail polish, is the most used cosmetic product. The components of the gel polish, which determine both toxicity and consumer color properties, are pigments. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments for use in gel polish. The parameters of the samples of Orange Yellow S-intercalated Zn-Al (Zn:Al=4:1 and Zn:Al=2:1) hydroxides synthesized at pH=8 and pH=11 were studied. The crystal structure of the samples was studied by X-ray phase analysis and thermogravimetry, and the pigment properties – by the method of measuring and calculating color characteristics in the CIELab and XYZ systems. The color characteristics of gel nail polish samples prepared using synthesized pigments were studied in a similar way. X-ray phase analysis and thermogravimetry showed that Zn-Al-Orange Yellow S pigments synthesized at both Zn:Al ratios and pH were layered double hydroxides with the α-Zn(OH) 2 structure. The phenomenon of the decomposition of Zn-Al LDH to ZnO during the synthesis was revealed. As a result, all Zn-Al-Orange Yellow S pigment samples contained both layered double hydroxide and zinc oxide. It was shown that all samples of the Zn-Al-Orange Yellow S pigment obtained at pH 8 and 11 and the ratios Zn:Al=4:1 and Zn:Al=2:1 had high pigment characteristics and are promising for use in gel polish. The samples of gel nail polish with synthesized pigments have a red-orange color (сolor tone 595–604 nm) with high monochromaticity (color purity 63–75 %) and color saturation (48.7–58.3)
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2020.214847&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kotok, Valerii; Kovalenko, Vadym;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIREThin films of nickel hydroxide were prepared using the cathodic template method and were tested in different electrolytes. The electrolytes were 0.1 M KOH and 0.1 M KOH with the addition of 0.1, 0.3 and 1 mM K2WO4. The test revealed, that the presence of tungstate can have a significant effect on electrochemical and electrochromic characteristics of Ni(OH)2 films. The initial sample, cycled in 0.1 M KOH showed different characteristics from those cycled in tungstate-containing electrolytes: significant difference between current densities of cathodic and anodic peaks and presence of the current plateau on the cyclic voltamperometry curve. However, the initial sample demonstrated the highest coloration degree of 74 %. On the other hand, the sample showed degradation of the coloration degree past initial growth.The samples cycled in the tungstate-containing electrolyte showed better electrochemical characteristics – sharper cathodic and anodic peaks, with the lesser difference between peak values. The dynamics of the absolute coloration degree of the samples cycled in tungstate-containing electrolyte showed a constant increase. The sample tested in a solution with 1 mM tungstate had the lowest value of the absolute coloration degree – 60 %. For tungstate concentrations of 0.1 and 0.3 mM, the absolution coloration degree at the last cycle was 72 and 71 % respectively.The samples tested in a solution with tungstate additive had a significantly lower bleaching time – 40–50 s in comparison to 360 s of the sample cycled in 0.1 М KOH.A possible mechanism that explains such differences in behavior was proposed
Access Routesgold 15 citations 15 popularity Top 10% influence Average impulse Top 10% 
Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.145223&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kotok, Valerii; Kovalenko, Vadym;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIREThin films of nickel hydroxide were prepared using the cathodic template method and were tested in different electrolytes. The electrolytes were 0.1 M KOH and 0.1 M KOH with the addition of 0.1, 0.3 and 1 mM K2WO4. The test revealed, that the presence of tungstate can have a significant effect on electrochemical and electrochromic characteristics of Ni(OH)2 films. The initial sample, cycled in 0.1 M KOH showed different characteristics from those cycled in tungstate-containing electrolytes: significant difference between current densities of cathodic and anodic peaks and presence of the current plateau on the cyclic voltamperometry curve. However, the initial sample demonstrated the highest coloration degree of 74 %. On the other hand, the sample showed degradation of the coloration degree past initial growth.The samples cycled in the tungstate-containing electrolyte showed better electrochemical characteristics – sharper cathodic and anodic peaks, with the lesser difference between peak values. The dynamics of the absolute coloration degree of the samples cycled in tungstate-containing electrolyte showed a constant increase. The sample tested in a solution with 1 mM tungstate had the lowest value of the absolute coloration degree – 60 %. For tungstate concentrations of 0.1 and 0.3 mM, the absolution coloration degree at the last cycle was 72 and 71 % respectively.The samples tested in a solution with tungstate additive had a significantly lower bleaching time – 40–50 s in comparison to 360 s of the sample cycled in 0.1 М KOH.A possible mechanism that explains such differences in behavior was proposed
Access Routesgold 15 citations 15 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.145223&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Valerii Kotok;
Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIREThe study is devoted to the development and testing of the electrochromic device based on Ni(OH)2/PVA (polyvinyl alcohol) composite and mesh counter-electrode. A copper wire with a layer of electroplated silver layer is proposed as a mesh material. Glass coated with fluorine-doped tin oxide after special treatment was used as a substrate for electrochrome deposition. The treatment lies in the shallow dissolution of the surface by means of soft electrochemical etching. The distance between the mesh and electrochromic electrodes was small and equal to 1.5 mm.The proposed design of the electrochromic device can lead to lower cost. However, it limits the range of possible applications for light windows or upper parts of view windows, building partitions.Over the course of the studies, it was demonstrated that the electrochromic device is operational and can be used for further scaling. Parameters of electrochemical cycling – working voltage window and current density, were found. It was found that the use of galvanostatic regime for color switching results in linear characteristics of the device.The use of the chosen voltodynamic regime results in a decrease of specific characteristics of the device – coloration degree and reversibility during bleaching.It was found that due to the small potential difference of nickel oxide and silver electrodes, the polarity of voltage during coloration and switching changes. Additionally, it is noted that no gas evolution was observed over the course of the experiments
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2019.181396&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Valerii Kotok;
Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIREThe study is devoted to the development and testing of the electrochromic device based on Ni(OH)2/PVA (polyvinyl alcohol) composite and mesh counter-electrode. A copper wire with a layer of electroplated silver layer is proposed as a mesh material. Glass coated with fluorine-doped tin oxide after special treatment was used as a substrate for electrochrome deposition. The treatment lies in the shallow dissolution of the surface by means of soft electrochemical etching. The distance between the mesh and electrochromic electrodes was small and equal to 1.5 mm.The proposed design of the electrochromic device can lead to lower cost. However, it limits the range of possible applications for light windows or upper parts of view windows, building partitions.Over the course of the studies, it was demonstrated that the electrochromic device is operational and can be used for further scaling. Parameters of electrochemical cycling – working voltage window and current density, were found. It was found that the use of galvanostatic regime for color switching results in linear characteristics of the device.The use of the chosen voltodynamic regime results in a decrease of specific characteristics of the device – coloration degree and reversibility during bleaching.It was found that due to the small potential difference of nickel oxide and silver electrodes, the polarity of voltage during coloration and switching changes. Additionally, it is noted that no gas evolution was observed over the course of the experiments
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2019.181396&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - V. A. Kotok;
V. A. Kotok
Harvested from ORCID Public Data FileV. A. Kotok in OpenAIRE V. L. Kovalenko; V. L. Kovalenko
Harvested from ORCID Public Data FileV. L. Kovalenko in OpenAIRE16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1149/2.0561910jes&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - V. A. Kotok;
V. A. Kotok
Harvested from ORCID Public Data FileV. A. Kotok in OpenAIRE V. L. Kovalenko; V. L. Kovalenko
Harvested from ORCID Public Data FileV. L. Kovalenko in OpenAIRE16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1149/2.0561910jes&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Vadym Kovalenko;
Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRENail polish, in particular gel polish, is the most commonly used cosmetic product. A component of the gel polish, which determines the consumer color characteristics of the gel polish. Layered double hydroxides (LDH) are promising pigments. To expand the range of colors and shades of pigments, the use of LDH with colored host and guest cations is promising. The parameters of synthesis and color characteristics of samples of Zn-Co and Cu-Co hydroxide pigments were studied. To obtain LDH with Co as a guest cation in the synthesis, the conversion of cobalt to the trivalent state was carried out at a temperature of 80 °C using oxidation with atmospheric oxygen or sodium hypochlorite. The oxidation efficiency was evaluated by X-ray phase analysis by the presence or absence of cobalt-containing phases. The color characteristics of the synthesized pigment samples were studied by spectroscopic measurement and calculation in RGB, CIELab, and LCH color models. The low efficiency of cobalt oxidation at the moment of Zn-Co LDH synthesis with atmospheric oxygen at an elevated synthesis temperature of 80 °C was shown, while cobalt was released as a separate Co3O4 phase. A higher efficiency of cobalt oxidation at the moment of synthesis using sodium hypochlorite with the formation of Zn-Co LDH was revealed. It is recommended to use the hypochlorite oxidation of Co2+ to Co3+ in the LDH synthesis with Co in the form of a guest cation. The formation of a separate phase of zinc oxide was found in both types of oxidation due to the thermal decomposition of zinc hydroxide. Comparative analysis of color characteristics showed that all samples have a brown color of different saturation. It was revealed that during the formation of Co-containing LDH, the lightness of the color decreases. Color saturation increases in the case of a colored host cation, such as Cu.
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2021.247160&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Vadym Kovalenko;
Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRENail polish, in particular gel polish, is the most commonly used cosmetic product. A component of the gel polish, which determines the consumer color characteristics of the gel polish. Layered double hydroxides (LDH) are promising pigments. To expand the range of colors and shades of pigments, the use of LDH with colored host and guest cations is promising. The parameters of synthesis and color characteristics of samples of Zn-Co and Cu-Co hydroxide pigments were studied. To obtain LDH with Co as a guest cation in the synthesis, the conversion of cobalt to the trivalent state was carried out at a temperature of 80 °C using oxidation with atmospheric oxygen or sodium hypochlorite. The oxidation efficiency was evaluated by X-ray phase analysis by the presence or absence of cobalt-containing phases. The color characteristics of the synthesized pigment samples were studied by spectroscopic measurement and calculation in RGB, CIELab, and LCH color models. The low efficiency of cobalt oxidation at the moment of Zn-Co LDH synthesis with atmospheric oxygen at an elevated synthesis temperature of 80 °C was shown, while cobalt was released as a separate Co3O4 phase. A higher efficiency of cobalt oxidation at the moment of synthesis using sodium hypochlorite with the formation of Zn-Co LDH was revealed. It is recommended to use the hypochlorite oxidation of Co2+ to Co3+ in the LDH synthesis with Co in the form of a guest cation. The formation of a separate phase of zinc oxide was found in both types of oxidation due to the thermal decomposition of zinc hydroxide. Comparative analysis of color characteristics showed that all samples have a brown color of different saturation. It was revealed that during the formation of Co-containing LDH, the lightness of the color decreases. Color saturation increases in the case of a colored host cation, such as Cu.
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2021.247160&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kovalenko, Vadym; Kotok, Valerii;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIRENickel hydroxide is widely used as an active material of supercapacitors. The most active are samples of Ni(OH) 2 with (α+β) layered structure synthesized in a slit diaphragm electrolyzer. However, the processes that occur during filtering and drying , negatively impact electrochemical activity. The influence of microwave treatment of different times (from 0.5 to 5 min) on the structure, surface morphology and porous structure, and also on the electrochemical properties of nickel hydroxide samples prepared in a slit diaphragm electrolyzer , has been studied. A hypothesis was proposed on the existence of the “popcorn effect”: short-term high-power microwave irradiation of the wet sample would result in water boiling and internal explosion of the sample. Treated and untreated samples were studied by means of X-ray diffraction analysis, scanning electron microscopy and BET nitrogen adsorption-desorption. Electrochemical characteristics were studied by means of galvanostatic charge-discharge cycling in the supercapacitor regime. The existence of the “popcorn effect” has been confirmed by increased sample thickness after microwave treatment by 1.94 times, specific surface area 2.13 times, pore volume by 2.66 times, and average pore diameter by 1.46 times, It was discovered , that increasing treatment duration to 2–5 min leads to microwave drying. XRD results revealed the occurrence of ageing (crystallization) processes of nickel hydroxide during thermal drying and their absence upon realization of the “popcorn effect”. This results in the formation of X-ray amorphous samples. Comparative analysis of electrochemical characteristics of treated and untreated Ni(OH) 2 samples was performed. An increase of specific capacity at high current densities (80 and 120 mA/cm 2 ) for treated samples was observed: by 10.9 % upon microwave drying, 24–42 % upon realization of the “popcorn effect”. The maximum capacity of 231.1 F/g has been observed for the sample, in which the “popcorn effect” was realized the most. However, microwave treatment resulted in lower capacities at low cycling current density. This is related to the thermal treatment of the particle surface, caused by rapid boiling of water. A magnetron of a higher power is required for avoiding this negative effect
Access Routesgold 8 citations 8 popularity Average influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.143126&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kovalenko, Vadym; Kotok, Valerii;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIRENickel hydroxide is widely used as an active material of supercapacitors. The most active are samples of Ni(OH) 2 with (α+β) layered structure synthesized in a slit diaphragm electrolyzer. However, the processes that occur during filtering and drying , negatively impact electrochemical activity. The influence of microwave treatment of different times (from 0.5 to 5 min) on the structure, surface morphology and porous structure, and also on the electrochemical properties of nickel hydroxide samples prepared in a slit diaphragm electrolyzer , has been studied. A hypothesis was proposed on the existence of the “popcorn effect”: short-term high-power microwave irradiation of the wet sample would result in water boiling and internal explosion of the sample. Treated and untreated samples were studied by means of X-ray diffraction analysis, scanning electron microscopy and BET nitrogen adsorption-desorption. Electrochemical characteristics were studied by means of galvanostatic charge-discharge cycling in the supercapacitor regime. The existence of the “popcorn effect” has been confirmed by increased sample thickness after microwave treatment by 1.94 times, specific surface area 2.13 times, pore volume by 2.66 times, and average pore diameter by 1.46 times, It was discovered , that increasing treatment duration to 2–5 min leads to microwave drying. XRD results revealed the occurrence of ageing (crystallization) processes of nickel hydroxide during thermal drying and their absence upon realization of the “popcorn effect”. This results in the formation of X-ray amorphous samples. Comparative analysis of electrochemical characteristics of treated and untreated Ni(OH) 2 samples was performed. An increase of specific capacity at high current densities (80 and 120 mA/cm 2 ) for treated samples was observed: by 10.9 % upon microwave drying, 24–42 % upon realization of the “popcorn effect”. The maximum capacity of 231.1 F/g has been observed for the sample, in which the “popcorn effect” was realized the most. However, microwave treatment resulted in lower capacities at low cycling current density. This is related to the thermal treatment of the particle surface, caused by rapid boiling of water. A magnetron of a higher power is required for avoiding this negative effect
Access Routesgold 8 citations 8 popularity Average influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.143126&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Vadym Kovalenko;
Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Anastasiia Borysenko; Anastasiia Borysenko
Harvested from ORCID Public Data FileAnastasiia Borysenko in OpenAIRE Anton Dopira; +4 AuthorsAnton Dopira
Harvested from ORCID Public Data FileAnton Dopira in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Anastasiia Borysenko; Anastasiia Borysenko
Harvested from ORCID Public Data FileAnastasiia Borysenko in OpenAIRE Anton Dopira; Anton Dopira
Harvested from ORCID Public Data FileAnton Dopira in OpenAIRE Anhelina Rezvantseva; Anhelina Rezvantseva
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesAnhelina Rezvantseva in OpenAIRE Rovil Nafeev; Rovil Nafeev
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesRovil Nafeev in OpenAIRE Volodymyr Verbitskiy; Volodymyr Verbitskiy
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesVolodymyr Verbitskiy in OpenAIRE Dmitry Sukhomlyn; Dmitry Sukhomlyn
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesDmitry Sukhomlyn in OpenAIREPigments are the main components of cosmetics, which determine both toxicity and consumer color characteristics. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments. The best sources of dyes for intercalation are natural ones. The most promising are spices. Natural dyes from spices are often biologically active substances. The parameters of samples of Zn-Al (Zn:Al=3:1) hydroxides intercalated with natural food dyes, synthesized in the medium of aqueous tinctures of saffron and safflower, were studied. The crystal structure of the samples was studied by X-ray phase analysis; color characteristics were studied by spectroscopy and calculation of parameters in the CIE L*a*b system. The possibility of synthesizing Zn-Al colored layered double hydroxides intercalated with natural dyes in the medium of saffron and safflower tinctures was shown. X-ray phase analysis showed that both pigment samples were layered double hydroxides with the α-Zn(OH)2 structure. For the pigment intercalated with saffron dye, the phenomenon of partial decomposition of Zn-Al LDH to ZnO during synthesis was revealed. The color characteristics of the samples were studied. Zn-Al LDH pigment synthesized in a saffron tincture had a bright yellow color determined by intercalated saffron carotenoids (crocin and crocetin). It was suggested that safflower dye flavonoids were partially hydrolyzed (red ones - cartamine and cartamidine, and yellow - Safflor Yellow A), which led to the formation of a dark orange-brown color of the sample. The prospects of using Zn-Al LDH intercalated with saffron food dyes as a cosmetic pigment were shown
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2022.260170&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Vadym Kovalenko;
Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Anastasiia Borysenko; Anastasiia Borysenko
Harvested from ORCID Public Data FileAnastasiia Borysenko in OpenAIRE Anton Dopira; +4 AuthorsAnton Dopira
Harvested from ORCID Public Data FileAnton Dopira in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Anastasiia Borysenko; Anastasiia Borysenko
Harvested from ORCID Public Data FileAnastasiia Borysenko in OpenAIRE Anton Dopira; Anton Dopira
Harvested from ORCID Public Data FileAnton Dopira in OpenAIRE Anhelina Rezvantseva; Anhelina Rezvantseva
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesAnhelina Rezvantseva in OpenAIRE Rovil Nafeev; Rovil Nafeev
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesRovil Nafeev in OpenAIRE Volodymyr Verbitskiy; Volodymyr Verbitskiy
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesVolodymyr Verbitskiy in OpenAIRE Dmitry Sukhomlyn; Dmitry Sukhomlyn
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesDmitry Sukhomlyn in OpenAIREPigments are the main components of cosmetics, which determine both toxicity and consumer color characteristics. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments. The best sources of dyes for intercalation are natural ones. The most promising are spices. Natural dyes from spices are often biologically active substances. The parameters of samples of Zn-Al (Zn:Al=3:1) hydroxides intercalated with natural food dyes, synthesized in the medium of aqueous tinctures of saffron and safflower, were studied. The crystal structure of the samples was studied by X-ray phase analysis; color characteristics were studied by spectroscopy and calculation of parameters in the CIE L*a*b system. The possibility of synthesizing Zn-Al colored layered double hydroxides intercalated with natural dyes in the medium of saffron and safflower tinctures was shown. X-ray phase analysis showed that both pigment samples were layered double hydroxides with the α-Zn(OH)2 structure. For the pigment intercalated with saffron dye, the phenomenon of partial decomposition of Zn-Al LDH to ZnO during synthesis was revealed. The color characteristics of the samples were studied. Zn-Al LDH pigment synthesized in a saffron tincture had a bright yellow color determined by intercalated saffron carotenoids (crocin and crocetin). It was suggested that safflower dye flavonoids were partially hydrolyzed (red ones - cartamine and cartamidine, and yellow - Safflor Yellow A), which led to the formation of a dark orange-brown color of the sample. The prospects of using Zn-Al LDH intercalated with saffron food dyes as a cosmetic pigment were shown
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2022.260170&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Valerii Kotok;
Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Ihor Kovalenko; Ihor Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesIhor Kovalenko in OpenAIRE Viktoriia Stoliarenko; +6 AuthorsViktoriia Stoliarenko
Harvested from ORCID Public Data FileViktoriia Stoliarenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Ihor Kovalenko; Ihor Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesIhor Kovalenko in OpenAIRE Viktoriia Stoliarenko; Viktoriia Stoliarenko
Harvested from ORCID Public Data FileViktoriia Stoliarenko in OpenAIRE Sergey Vlasov; Sergey Vlasov
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesSergey Vlasov in OpenAIRE Viktor Ved; Viktor Ved
Harvested from ORCID Public Data FileViktor Ved in OpenAIRE Iryna Plaksiienko; Iryna Plaksiienko
Harvested from ORCID Public Data FileIryna Plaksiienko in OpenAIRE Paul Pisarenko; Paul Pisarenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesPaul Pisarenko in OpenAIRE Marina Samoilik; Marina Samoilik
Harvested from ORCID Public Data FileMarina Samoilik in OpenAIRE Kostiantyn Sukhyy; Kostiantyn Sukhyy
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesKostiantyn Sukhyy in OpenAIREThe present study is devoted to an attempt to improve the characteristics of nickel hydroxide electrochromic films. The study of optical and electrochemical characteristics of the films, prepared through the codeposition of nickel and aluminum and additional modification during the cycling of the prepared samples was conducted. The modification was realized through the cycling of films in the solution of potassium hydroxide with small amounts of potassium tungstate. Over the course of the study, a series of films were obtained, which demonstrated different electrochemical and optical behavior. Thus, it was found that both the deposition method and the cycling regime have a significant effect on the characteristics of electrochromic films. It is shown that for the potentiodynamic regime, the best characteristics were demonstrated by the film without modifications or additives. On the other hand, all modified films, codeposited with aluminum, demonstrated better characteristics in galvanostatic regimes over the reference film. It would appear that this is due to the physico-chemical features of the films deposited in the presence of additives. In turn, the use of high-rate cycling regime leads to a decrease of electrochromic characteristics, namely higher degree of irreversibility. Despite the difference of currents in different galvanostatic regimes by 4 times, the coloration degree did not differ much. It was also found that the presence of 0.3 mM potassium tungstate in the cycling electrolyte resulted in a significant decrease in the electrochromic properties of the samples
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2019.185822&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Valerii Kotok;
Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Ihor Kovalenko; Ihor Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesIhor Kovalenko in OpenAIRE Viktoriia Stoliarenko; +6 AuthorsViktoriia Stoliarenko
Harvested from ORCID Public Data FileViktoriia Stoliarenko in OpenAIRE Valerii Kotok; Valerii Kotok
Harvested from ORCID Public Data FileValerii Kotok in OpenAIRE Vadym Kovalenko; Vadym Kovalenko
Harvested from ORCID Public Data FileVadym Kovalenko in OpenAIRE Ihor Kovalenko; Ihor Kovalenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesIhor Kovalenko in OpenAIRE Viktoriia Stoliarenko; Viktoriia Stoliarenko
Harvested from ORCID Public Data FileViktoriia Stoliarenko in OpenAIRE Sergey Vlasov; Sergey Vlasov
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesSergey Vlasov in OpenAIRE Viktor Ved; Viktor Ved
Harvested from ORCID Public Data FileViktor Ved in OpenAIRE Iryna Plaksiienko; Iryna Plaksiienko
Harvested from ORCID Public Data FileIryna Plaksiienko in OpenAIRE Paul Pisarenko; Paul Pisarenko
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesPaul Pisarenko in OpenAIRE Marina Samoilik; Marina Samoilik
Harvested from ORCID Public Data FileMarina Samoilik in OpenAIRE Kostiantyn Sukhyy; Kostiantyn Sukhyy
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesKostiantyn Sukhyy in OpenAIREThe present study is devoted to an attempt to improve the characteristics of nickel hydroxide electrochromic films. The study of optical and electrochemical characteristics of the films, prepared through the codeposition of nickel and aluminum and additional modification during the cycling of the prepared samples was conducted. The modification was realized through the cycling of films in the solution of potassium hydroxide with small amounts of potassium tungstate. Over the course of the study, a series of films were obtained, which demonstrated different electrochemical and optical behavior. Thus, it was found that both the deposition method and the cycling regime have a significant effect on the characteristics of electrochromic films. It is shown that for the potentiodynamic regime, the best characteristics were demonstrated by the film without modifications or additives. On the other hand, all modified films, codeposited with aluminum, demonstrated better characteristics in galvanostatic regimes over the reference film. It would appear that this is due to the physico-chemical features of the films deposited in the presence of additives. In turn, the use of high-rate cycling regime leads to a decrease of electrochromic characteristics, namely higher degree of irreversibility. Despite the difference of currents in different galvanostatic regimes by 4 times, the coloration degree did not differ much. It was also found that the presence of 0.3 mM potassium tungstate in the cycling electrolyte resulted in a significant decrease in the electrochromic properties of the samples
Access RoutesGreen gold add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2019.185822&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kotok, Valerii; Kovalenko, Vadym;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIREAs a result of conducted studies, a series of electrochromic Ni(OH) 2 films were prepared using the cathodic template method under the same conditions. Prepared films have been used for comparison of regimes for coloration-bleaching cycling. Main qualitative characteristics were also evaluated – averaged absolute coloration degree, averaged irreversibility on bleaching and visual comparison in the colored state after cycling. To compare the influence of different regimes, potentiodynamic, galvanostatic and complex regimes were proposed. For potentiodynamic regimes, different upper and lower potential limits were chosen. Initial current density for galvanostatic and complex regimes was chosen based on the results of the cyclic voltamperometry curve. Chosen current density was equal to the cathodic peak value on the fifth cycle of the cyclic voltamperometry curve recorded in the following regime: potential window [201–751 mV], scan rate 1 mV/s. Coloration-bleaching cycling in different regimes revealed high effectiveness of potentiodynamic regimes which showed the highest coloration degree of the films. On the other hand, it was found that narrowing and widening of potential windows relative to optimal resulted in worse characteristics of electrochromic films. Galvanostatic regimes showed the most optimal results in terms of absolute coloration degree and time required for coloration/bleaching. Complex regimes demonstrated the worst results. Theses regimes resulted in significant irreversibility and average rate of coloration and bleaching. Galvanostatic and complex regimes revealed the presence of two plateaus on the current density curves, which indicates the presence of both α-Ni(OH) 2 and β-Ni(OH) 2 in electrochromic material
Access Routesgold 11 citations 11 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.150577&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kotok, Valerii; Kovalenko, Vadym;
Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIREAs a result of conducted studies, a series of electrochromic Ni(OH) 2 films were prepared using the cathodic template method under the same conditions. Prepared films have been used for comparison of regimes for coloration-bleaching cycling. Main qualitative characteristics were also evaluated – averaged absolute coloration degree, averaged irreversibility on bleaching and visual comparison in the colored state after cycling. To compare the influence of different regimes, potentiodynamic, galvanostatic and complex regimes were proposed. For potentiodynamic regimes, different upper and lower potential limits were chosen. Initial current density for galvanostatic and complex regimes was chosen based on the results of the cyclic voltamperometry curve. Chosen current density was equal to the cathodic peak value on the fifth cycle of the cyclic voltamperometry curve recorded in the following regime: potential window [201–751 mV], scan rate 1 mV/s. Coloration-bleaching cycling in different regimes revealed high effectiveness of potentiodynamic regimes which showed the highest coloration degree of the films. On the other hand, it was found that narrowing and widening of potential windows relative to optimal resulted in worse characteristics of electrochromic films. Galvanostatic regimes showed the most optimal results in terms of absolute coloration degree and time required for coloration/bleaching. Complex regimes demonstrated the worst results. Theses regimes resulted in significant irreversibility and average rate of coloration and bleaching. Galvanostatic and complex regimes revealed the presence of two plateaus on the current density curves, which indicates the presence of both α-Ni(OH) 2 and β-Ni(OH) 2 in electrochromic material
Access Routesgold 11 citations 11 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.150577&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kovalenko, Vadym;
Kovalenko, Vadym
Harvested from ORCID Public Data FileKovalenko, Vadym in OpenAIRE Kotok, Valerii; Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIRENickel hydroxide is widely used as an active material s of supercapacitors. The most active are Ni(OH) 2 (α+β) samples with layered structure synthesized in a slit-diaphragm electrolyzer. The study on the influence of template synthesis and ultrasound treatment on the characteristics of the samples was conducted. The synthesis of nickel hydroxide samples in the presence of polyvinyl alcohol as a template and the use of ultrasound treatment of the Ni(OH) 2 suspension directly after formation was carried out. The synthesized samples of nickel hydroxide were studied by means X-ray diffraction analysis, scanning electron microscopy, and BET nitrogen adsorption-desorption. Electrochemical characteristics were evaluated by means of galvanostatic charge-discharge cycling in the supercapacitor regime. Comparative analysis of the Ni(OH) 2 sample has revealed both negative and positive effect of the template and ultrasound. The use of PVA as a template and ultrasound treatment resulted in a significant decrease in specific surface area (to 6 m 2 /g) and an increase of the average pore diameter (to 1181 Ǻ). Application of the template and ultrasound decreases crystallinity and increases the content of α-form, which results in the increased capacity of the samples. The maximum value of 233 F/g is achieved at a current density of 40 mA/cm 2 obtained from the combined effect of the template and ultrasound. Under these conditions, the specific capacity of the sample prepared without the template and ultrasound is 76 F/g. However, with an increase of current density to 120 mA/cm 2 , the capacity of this sample increases to 303 F/g. At the same time, for samples synthesized with the template and ultrasound, a decrease of capacity is observed at higher current densities, which is related to difficulties in the breakdown of agglomerated particles. In case of the introduced template, this is explained by the binding effect of the remaining PVA and in case of ultrasound treatment – particle condensation. Based on the results of the comparative analysis, it is recommended to replace the template with a more easily removable one and also conduct an electrochemical synthesis of Ni(OH) 2 in SDE directly in the ultrasound field and increase the power of the emitter.
Access Routesgold 19 citations 19 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.133548&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu - Kovalenko, Vadym;
Kovalenko, Vadym
Harvested from ORCID Public Data FileKovalenko, Vadym in OpenAIRE Kotok, Valerii; Kotok, Valerii
Harvested from ORCID Public Data FileKotok, Valerii in OpenAIRENickel hydroxide is widely used as an active material s of supercapacitors. The most active are Ni(OH) 2 (α+β) samples with layered structure synthesized in a slit-diaphragm electrolyzer. The study on the influence of template synthesis and ultrasound treatment on the characteristics of the samples was conducted. The synthesis of nickel hydroxide samples in the presence of polyvinyl alcohol as a template and the use of ultrasound treatment of the Ni(OH) 2 suspension directly after formation was carried out. The synthesized samples of nickel hydroxide were studied by means X-ray diffraction analysis, scanning electron microscopy, and BET nitrogen adsorption-desorption. Electrochemical characteristics were evaluated by means of galvanostatic charge-discharge cycling in the supercapacitor regime. Comparative analysis of the Ni(OH) 2 sample has revealed both negative and positive effect of the template and ultrasound. The use of PVA as a template and ultrasound treatment resulted in a significant decrease in specific surface area (to 6 m 2 /g) and an increase of the average pore diameter (to 1181 Ǻ). Application of the template and ultrasound decreases crystallinity and increases the content of α-form, which results in the increased capacity of the samples. The maximum value of 233 F/g is achieved at a current density of 40 mA/cm 2 obtained from the combined effect of the template and ultrasound. Under these conditions, the specific capacity of the sample prepared without the template and ultrasound is 76 F/g. However, with an increase of current density to 120 mA/cm 2 , the capacity of this sample increases to 303 F/g. At the same time, for samples synthesized with the template and ultrasound, a decrease of capacity is observed at higher current densities, which is related to difficulties in the breakdown of agglomerated particles. In case of the introduced template, this is explained by the binding effect of the remaining PVA and in case of ultrasound treatment – particle condensation. Based on the results of the comparative analysis, it is recommended to replace the template with a more easily removable one and also conduct an electrochemical synthesis of Ni(OH) 2 in SDE directly in the ultrasound field and increase the power of the emitter.
Access Routesgold 19 citations 19 popularity Top 10% influence Average impulse Top 10% Powered by BIP!add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.<script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.15587/1729-4061.2018.133548&type=result"></script>'); --> </script>For further information contact us at helpdesk@openaire.eu
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