07December2019

Nano-Micro Letters

High-Power and Ultralong-Life Aqueous Zinc-Ion Hybrid Capacitors Based on Pseudocapacitive Charge Storage

Liubing Dong 1, †, Wang Yang 1, †, Wu Yang 1, Chengyin Wang 2, Yang Li 3, Chengjun Xu 4, *, Shuwei Wan 5, Fengrong He 5, Feiyu Kang 4, Guoxiu Wang 1, *

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Nano-Micro Lett. (2019) 11: 94

First Online: 31 October 2019 (Article)

DOI:10.1007/s40820-019-0328-3

*Corresponding author. E-mail: vivaxuchengjun@163.com (C. Xu); guoxiu.wang@uts.edu.au (G. Wang)

 

Abstract

 


Toc

Rechargeable aqueous zinc-ion hybrid capacitors and zinc-ion batteries are promising safe energy storage systems. In this study, amorphous RuO2·H2O for the first time was employed to achieve fast and ultralong-life Zn2+ storage based on a pseudocapacitive storage mechanism. In the RuO2·H2O||Zn zinc-ion hybrid capacitors with Zn(CF3SO3)2 aqueous electrolyte, the RuO2·H2O cathode can reversibly store Zn2+ in a voltage window of 0.4-1.6 V (vs. Zn/Zn2+), delivering a high discharge capacity of 122 mAh g-1. In particular, the zinc-ion hybrid capacitors can be rapidly charged/discharged within 36 s with a very high power density of 16.74 kW kg-1 and a high energy density of 82 Wh kg-1. Besides, the zinc-ion hybrid capacitors demonstrate an ultralong cycle life (over 10,000 charge/discharge cycles). The kinetic analysis elucidates that the ultrafast Zn2+ storage in the RuO2·H2O cathode originates from redox pseudocapacitive reactions. This work could greatly facilitate the development of high-power and safe electrochemical energy storage.


 

Keywords

Zinc-ion hybrid capacitor; Hydrous ruthenium oxide; Ultra-long life; Redox pseudocapacitance; High power

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