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Issue 23, 2020
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A N, O co-doped hierarchical carbon cathode for high-performance Zn-ion hybrid supercapacitors with enhanced pseudocapacitance

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Abstract

Zn-ion hybrid supercapacitors (ZHSs) are an advanced energy storage system with high energy/power density. However, the development of cathodes with high-performance is still a challenge. Herein, N, O co-doped hierarchical porous carbon (HPC) integrated with carbon cloth (CC) was fabricated as a promising cathode for aqueous ZHSs, which delivered a high specific capacity of 138.5 mA h g−1 with excellent rate performance ( 75 mA h g−1 at 20 A g−1) and superb cycling stability without decay after 10 000 cycles. As a result, an exceptionally high energy density of 110 W h kg−1 and attractive power density of 20 kW kg−1 can be obtained. More importantly, the dual cation (H+ and Zn2+) chemical absorption process for additional capacity is firstly proposed and verified by ex situ experiments, while the precipitation/dissolution process of zinc hydroxide sulphate hydrate is explained. Furthermore, a quasi-solid-state HPC/CC-based ZHS device based on gel electrolyte also showed promising potential for practical applications. This work provides a new pathway to develop carbon-based cathode materials for sustainable ZHSs.

Graphical abstract: A N, O co-doped hierarchical carbon cathode for high-performance Zn-ion hybrid supercapacitors with enhanced pseudocapacitance

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Supplementary files

Article information


Submitted
10 Mar 2020
Accepted
10 May 2020
First published
11 May 2020

J. Mater. Chem. A, 2020,8, 11617-11625
Article type
Paper

A N, O co-doped hierarchical carbon cathode for high-performance Zn-ion hybrid supercapacitors with enhanced pseudocapacitance

X. Deng, J. Li, Z. Shan, J. Sha, L. Ma and N. Zhao, J. Mater. Chem. A, 2020, 8, 11617
DOI: 10.1039/D0TA02770G

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