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.
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
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