• Energy Research

This study presents a novel approach utilizing solvothermal techniques to synthesize zeolitic imidazolate framework (ZIF‐4) particles. Various properties of the ZIF‐4 particles are investigated to shed light on the structural and morphological characteristics. These ZIF‐4 particles act as a positive triboelectric layer in the fabrication of a triboelectric nanogenerator (TENG) designed for powering electronic devices. The solvothermal‐assisted synthesis ensures the controlled and efficient production of ZIF‐4, optimizing its characteristics for enhanced performance in the TENG. The generated TENG, based on ZIF‐4 particles, determines promising capabilities in converting mechanical energy into electrical power. The highest power of TENG is obtained to be 18 μW at a load resistance of 50 MΩ. This work contributes major insights to the search for sustainable and effective power solutions for electronic gadgets. It emphasizes the potential of ZIF‐4 as a crucial triboelectric material, demonstrating its importance in the advancement of TENGs.

Covalent organic frameworks (COFs) with triazine skeleton have been developed via reticular chemistry. In this present work, a triazine-based nitrogen-rich organic moiety has been used for the COF synthesis and then tested for the output performance of a triboelectric nanogenerator (TENG) using the same. The synthesized COF has been characterized by several physical characterization techniques. For the first time, the surface potential of the prepared COF material was tested experimentally using Kelvin probe force microscopy, which indicates a very high positive triboelectric potential of 2.03 V. The single unit of COF-based TENG delivered 70 V, 0.6 μA, and 38 nC as an electrical output. In the case of multiunit TENG, the current and voltage values are boosted as the parallel connection of four units of TENG gave the peak-to-peak current output rises by 6.3 μA. In comparison, the series connection of four units of TENG gave a high peak-to-peak voltage of 175 V. This work describes the synthesis of N-rich COF material, fabrication of the TENG, and the excellent energy harvesting performance with the realization of low-cost self-powered hand strengthening device. This result paves the way to achieve fruitful exercise monitoring units towards improving lifestyle. © 2022 Elsevier Ltd ; FALSE ; scie ; scopus

The spent catalysts discarded during chemical manufacturing can be a source of pollution and are classified as hazardous waste. Looking at the bright sides of the mission of waste management, such as recycling and reducing, reuse such types of the spent catalyst can be chemically treated to extract valuable salts and metals. Such a process not only reduces waste disposal issues but also promotes a circular economy ecosystem. This present study aims to extract MoO3 from the spent petroleum catalyst, Mo–Ni/Al2O3, and further processing of Mo‐metal organic framework (MOF) particles using extracted MoO3 and imidazole acting as an organic binder. The structural, morphology, and thermal properties of Mo‐MOF are evaluated. The surface roughness and positive surface potential of the Mo‐MOF are achieved. The Mo‐MOF/Kapton‐based triboelectric nanogenerators (TENG) generate a 148 V voltage, 470 nA current, and 17 nC charge. Further, TENG is utilized to charge the capacitors, and powering of the electronic devices is demonstrated. The repetition of the boxing punches and exercises can be monitored using TENGs and paves the way toward intelligent sports or healthcare.

Metal–organic frameworks (MOFs) have emerged as a transformative class of materials in materials science and chemistry due to their exceptional porosity and structural tunability. Composed of metal ions or clusters intricately coordinated with organic ligands, MOFs form highly ordered 3D networks with well‐defined pores and channels. These unique characteristics enable precise customization of pore size, shape, and functionality through the selection of appropriate metal ions and ligands, unlocking diverse applications across multiple fields. This review provides a comprehensive exploration of MOFs, focusing on their synthesis, structural properties, and versatility. Key areas of discussion include MOFs’ potential for catalytic activity, gas storage, sensing, and drug delivery. Of particular importance is their transformative role in environmental remediation, energy storage, and biomedical applications, demonstrating their adaptability to modern challenges. However, significant barriers such as scalability, long‐term stability, and economic viability must be addressed to enable widespread adoption. By detailing state‐of‐the‐art advancements, this review highlights MOFs’ unparalleled ability to achieve precision and efficiency in targeted applications, offering valuable insights for emerging researchers. The findings underscore MOFs’ pivotal role in addressing contemporary scientific and industrial challenges, paving the way for innovative solutions in energy, environment, and health.

Triboelectric nanogenerators (TENG) is an effective approach for the development of self-powered systems, as it offers several flexibilities, such as wide material choice, high power density, simple fabrication process, etc. In this present work, the zeolite imidazole framework (ZIF-8) is synthesized by two approaches: solvent-assisted (SA) and solvent-free (HG), and explored its applicability in TENG devices for energy harvesting. The formation of the highly crystalline ZIF-8 is established from structural and morphological studies. An attempt has been made to understand the surface roughness and surface potential of the synthesized materials that could directly fit their scopes in the addition of the conventional triboelectric series due to their positive surface potential. A cost-effective and facile approach of re-using the waste 3D printing parts is attempted to design vertical contact separation and single electrode mode TENG. The correlation between the material's properties, such as surface potential and surface roughness, supports the ZIF-8 (HG)/Kapton-based dual-mode TENG device to deliver higher electrical output. The triple-unit TENG was designed and fabricated using an additive manufacturing route to achieve a voltage of 150 V and a current of 4.95 µA. Further, both the dual-mode TENG devices are demonstrated to explore self-powered applications by integration with robotics tilt table and biomechanical energy harvesting. © 2022 Elsevier Ltd ; FALSE ; scie ; scopus