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Eastern-European Journal of Enterprise Technologies
Article . 2018 . Peer-reviewed
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A study of the effect of cycling modes on the electrochromic properties of Ni(OH)2 films

Authors: Kotok, Valerii; Kovalenko, Vadym;

A study of the effect of cycling modes on the electrochromic properties of Ni(OH)2 films

Abstract

As 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

Keywords

electrochromism; cycling; cyclic voltamperometry; galvanostatic; potentiostatic; electrodeposition; Ni(OH)2; nickel hydroxide, електрохромізм; циклування; циклічна вольтамперометрія; гальваностатичний; потенціостатичний електроосадження; Ni(OH)2; гідроксид нікелю, UDC 544.653.1, электрохромизм; циклирование; циклическая вольтамперометрия; гальваностатический; потенциостатический электроосаждение; Ni(OH)2; гидроксид никеля

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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    11
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
11
Top 10%
Average
Top 10%
gold