An Aqueous All-Metal Oxide Asymmetric Supercapacitor with High Gravimetric and Volumetric Energy Densities

Authors

JING Xin, School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, P. R. China;Qingdao Center of Resource Chemistry & New Materials, Qingdao 266000, P.R. China;
Xu ZHANG, Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China;
WANG Wei, School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, P. R. China;Follow
LANG Jun-wei, Qingdao Center of Resource Chemistry & New Materials, Qingdao 266000, P.R. China;Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China;Follow

Corresponding Author

WANG Wei(clwang@ouc.edu.cn);
LANG Jun-wei(jwlang@licp.cas.cn)

Abstract

Only with both high gravimetric and high volumetric energy densities, can supercapacitors find more extensive applications.In this paper, by making good use of the interesting nanostructures and the high packing densities of RuO₂ (nanoshpheres,1.69 g·cm^-3) and Co-Ni oxide (nanoflakes, 2.14 g·cm^-3), the RuO₂//KOH//Co-Ni oxide all-metal oxide asymmetric supercapacitors with high performance were successfully fabricated, which led to the maximum specific capacitance of 217.5 F·g^-1 (412.3 F·cm^-3) and specific energy density of 61.8 Wh·kg^-1 (121 Wh·L^-1) in a cell voltage between 0 and 1.5 V in KOH electrolyte. In addition, the constructed supercapacitor device could retain 87% of the initial specific capacitance even at 5000th cycle with the cell voltage of 1.4 V at a current density of 2 A·g^-1 in life cycle test, indicating high electrochemical stability.

Graphical Abstract

Keywords

metal oxide, Co-Ni oxide nanoflakes, RuO2 nanoshpheres, high gravimetric and volumetric energy density, aqueous asymmetric supercapacitors

DOI Link

https://doi.org/10.13208/j.electrochem.180204

Publication Date

2018-08-28

Online Available Date

2018-04-18

Revised Date

2018-03-26

Received Date

2018-02-04

Recommended Citation

JING Xin, Xu ZHANG, WANG Wei, LANG Jun-wei. An Aqueous All-Metal Oxide Asymmetric Supercapacitor with High Gravimetric and Volumetric Energy Densities[J]. Journal of Electrochemistry, 2018 , 24(4): 332-343.
DOI: 10.13208/j.electrochem.180204
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss4/4