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Updated: Sep 24, 2025

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Anchoring carbon layers and oxygen vacancies endow WO3- /C electrode with high specific capacity and rate performance
Juan Xu1, Chongyang Li1, Lulu Chen1
1Institute of Electric Power, North China University of Water Resources and Electric Power Zhengzhou Henan 450000 China xujuan@ncwu.edu.cn.
Abstract:
Herein, novel hierarchical carbon layer-anchored WO3- /C ultra-long nanowires were developed via a facile solvent-thermal treatment and a subsequent rapid carbonization process. The inner anchored carbon layers and abundant oxygen vacancies endowed the WO3- /C nanowire electrode with high conductivity, as measured with a single nanowire, which greatly enhanced the redox reaction active sites and rate performance. Surprisingly, the WO3- /C electrode exhibited outstanding specific capacitance of 1032.16 F g-1 at the current density of 1 A g-1 in a 2 M H2SO4 electrolyte and maintained the specific capacitance of 660 F g-1 when the current density increased to 50 A g-1. Significantly, the constructed WO3- /C//WO3- /C symmetric supercapacitors achieved specific capacitance of 243.84 F g-1 at the current density of 0.5 A g-1 and maintained the capacitance retention of 94.29% after 5000 charging/discharging cycles at the current density of 4 A g-1. These excellent electrochemical performances resulted from the fascinating structure of the WO3- /C nanowires, showing a great potential for future energy storage applications.
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