An Aqueous Zn-Ion Capacitor

Authors

Jing-wen ZHAO, ingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Shandong Qingdao 266101, China;
Jia-jia LI, Ocean University of China, Shandong Qingdao 266100, China
Peng-xian HAN, ingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Shandong Qingdao 266101, China;
Guang-lei CUI, ingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Shandong Qingdao 266101, China;Follow

Corresponding Author

Guang-lei CUI(cuigl@qibebt.ac.cn)

Abstract

We first present a new aqueous zinc-ion (Zn-ion) capacitor based on vanadium pentoxide ( V₂O₅) cathode, activated carbon (AC) anode, and 2 mol·L^-1 zinc trifluoromethanesulfonate (Zn(TfO)₂) electrolyte. The Zn-ion capacitor possesses a wide electrochemical window of 1.4 V, good rate capability and cycling stability. The XRD data demonstrates that the Zn²⁺ ion serving as the charge carrier could be reversibly intercalated into the V₂O₅. This capacitor delivered a power density of 181 W·kg^-1 and an energy density of 4.5 Wh·kg^-1 at 1000 mA·g^-1. This work may open up new opportunities for developing multivalent ion-based electrochemical capacitors.

Graphical Abstract

Keywords

Supercapacitor, Zn-ion capacitor; V2O5, multivalent ion (de-)intercalation, aqueous electrolyte.

DOI Link

https://doi.org/10.13208/j.electrochem.170344

Publication Date

2017-10-28

Online Available Date

2017-10-28

Revised Date

2017-05-12

Received Date

2017-03-28

Recommended Citation

Jing-wen ZHAO, Jia-jia LI, Peng-xian HAN, Guang-lei CUI. An Aqueous Zn-Ion Capacitor[J]. Journal of Electrochemistry, 2017 , 23(5): 170344.
DOI: 10.13208/j.electrochem.170344
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss5/11