Assemblies and Properties of Asymmetric Supercapacitors Based on WO₃/Carbon Cloth

Authors

Wen-ke SHAO, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;
Lei ZHAO, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;
Chao LIU, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;
Yan-ying DONG, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;
Yuan-jie ZHU, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;
Qiu-fan WANG, Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei,China;Follow

Corresponding Author

Qiu-fan WANG(YGDF@mail.scuec.edu.cn)

Abstract

The demand for a new generation of flexible, portable, and high-capacity power sources increases rapidly with the development of advanced wearable electronic devices. One dimensional (1D) nanowires structures have been demonstrated as one of the most ideal electrode materials in energy storage systems due to their advantages in both micorstructures and their high surface areas. Here we report a simple process for large-scale fabrication of self-standing composite film electrodes composed of WO₃ nanorods on carbon cloth. In order to improve the energy density of supercapacitor, we assembled an asymmetric supercapacitor using WO₃ nanorods and activated carbon cloth as positive and negative electrodes, respectively. The scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the morphology and structure of the electrode materials, respectively. In addition, cyclic voltammetry (CV), galvanostatic charge-diacharge (GCD) test, and electrochemical impedance spectroscopy (EIS) were employed to study the electrode materials in a three-electrode system. It was found that the WO₃ nanorods exhibited attractive electrochemical performance as well as remarkable flexibility with the high areal capacitance of 3347 mF·cm^-2 at 5 mA·cm^-2. In addition, to improve the electrochemical performance of activated carbon cloth by introducing function groups onto its surface for producing pseudocapacitance and increasing surface area by electrochemically oxidizing CC in the mixed acid solution, it was also shown the high areal capacitance of 1160 mF·cm^-2 at 7 mA·cm^-2. This method was simpler and more effective compared with the previous strategies for activating carbon materials. The as-fabricated asymmetric supercapacitor based on WO₃/carbon cloth exhibited high areal capacitance of 58.96 F·cm^-2 at 61.9 mA·cm^-2, high energy density of 20.36 mWh·cm^-2 at 0.48 W·cm^-2 with the operation voltage window expanding to 0 ~ 1.6 V, and excellent lifespan after 3000 cycles. This work opens up a novel, low-cost route to design advanced integrated-array and high performance electrode materials for portable supercapacitor application on a large scale.

Graphical Abstract

Keywords

WO3, asymmetric supercapacitor, flexible, energy density

DOI Link

https://doi.org/10.13208/j.electrochem.180124

Publication Date

2018-08-28

Online Available Date

2018-03-28

Revised Date

2018-03-05

Received Date

2018-01-24

Recommended Citation

Wen-ke SHAO, Lei ZHAO, Chao LIU, Yan-ying DONG, Yuan-jie ZHU, Qiu-fan WANG. Assemblies and Properties of Asymmetric Supercapacitors Based on WO₃/Carbon Cloth[J]. Journal of Electrochemistry, 2018 , 24(4): 351-358.
DOI: 10.13208/j.electrochem.180124
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss4/6