Hydrothermally synthesized copper telluride nanoparticles: First approach to flexible solid-state symmetric supercapacitor
[Display omitted] •Cu2-xTe nanoparticles explored for supercapacitor electrodes.•Small size (38 nm) and high crystallinity enhance charge storage.•Fabricated flexible, symmetric supercapacitors in PVA-LiClO4 gel.•Devices show 11 Wh/kg energy density, 800 W/kg power density.•Maintain 85% stability af...
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Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 498; p. 155284 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.10.2024
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•Cu2-xTe nanoparticles explored for supercapacitor electrodes.•Small size (38 nm) and high crystallinity enhance charge storage.•Fabricated flexible, symmetric supercapacitors in PVA-LiClO4 gel.•Devices show 11 Wh/kg energy density, 800 W/kg power density.•Maintain 85% stability after 5000 cycles.
Supercapacitors, with their high-power density, rapid charge–discharge rates, and long cycle life, have emerged as promising energy storage devices for numerous applications. Among the various materials explored for supercapacitor electrodes, copper-based chalcogenides have gathered significant attention due to their intriguing electrochemical properties and simple synthesis routes. While there have been thorough investigations in other fields, only a limited number of studies have focused on the specific application of copper telluride nanoparticles as supercapacitors. In this study, we present a novel approach utilizing hydrothermally synthesized copper telluride (Cu2-xTe) nanoparticles as binder-free electrodes on flexible stainless steel (SS) substrates. The Cu2-xTe nanoparticles, with their small particle (38 nm) and highly crystalline structure, enhance charge storage and promotes a pseudocapacitive behavior, resulting in a high specific capacitance [381 F/g (163 mF/cm2) at 2 mV/s] in a 2 M KCl electrolyte solution. Moreover, we studied and explained the distinct contributions of surface-controlled and diffusion-limited processes to the overall charge storage capacity of the electrode. Our pioneering effort includes the fabrication and analysis of flexible, symmetric solid-state supercapacitor devices utilizing Cu2-xTe electrodes with PVA-LiClO4 gel electrolyte. These devices demonstrate an energy density of 11 Wh/kg, a power density of 800 W/kg, and an impressive 85 % retention of cyclic stability after 5000 cycles. |
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ISSN: | 1385-8947 |
DOI: | 10.1016/j.cej.2024.155284 |