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Vol. 9 No. 3 (2017)

High-Performance Flexible Asymmetric Supercapacitor Based on CoAl-LDH and rGO Electrodes

https://doi.org/10.1007/s40820-017-0134-8
Shuoshuo Li
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Pengpeng Cheng
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Jiaxian Luo
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Dan Zhou
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Weiming Xu
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Jingwei Li
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Ruchun Li
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China
Dingsheng Yuan
School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, People’s Republic of China

Corresponding Author: Dingsheng Yuan

tydsh@jnu.edu.cn

Nano-Micro Letters, Vol. 9 No. 3 (2017), Article Number: 31

Abstract

A flexible asymmetric supercapacitor (ASC) based on a CoAl-layered double hydroxide (CoAl-LDH) electrode and a reduced graphene oxide (rGO) electrode was successfully fabricated. The CoAl-LDH electrode as a positive electrode was synthesized by directly growing CoAl-LDH nanosheet arrays on a carbon cloth (CC) through a facile hydrothermal method, and it delivered a specific capacitance of 616.9 F g−1 at a current density of 1 A g−1. The rGO electrode as a negative electrode was synthesized by coating rGO on the CC via a simple dip-coating method and revealed a specific capacitance of 110.0 F g−1 at a current density of 2 A g−1. Ultimately, the advanced ASC offered a broad voltage window (1.7 V) and exhibited a high superficial capacitance of 1.77 F cm−2 at 2 mA cm−2 and a high energy density of 0.71 mWh cm−2 at a power density of 17.05 mW cm−2, along with an excellent cycle stability (92.9% capacitance retention over 8000 charge–discharge cycles).


Highlights:


1 CoAl-LDH (layer double hydroxide) electrode and binder-free rGO (reduced graphene oxide) electrode were successfully synthesized and assembled to produce a flexible ASC (asymmetric supercapacitor).
2 The assembled ASC device exhibited excellent capacitive performance.

Keywords

Flexible asymmetric supercapacitor Layer double hydroxides Reduced graphene oxide Cycle stability
Li, Shuoshuo, Pengpeng Cheng, Jiaxian Luo, Dan Zhou, Weiming Xu, Jingwei Li, Ruchun Li, and Dingsheng Yuan. 2017. “High-Performance Flexible Asymmetric Supercapacitor Based on CoAl-LDH and RGO Electrodes”. Nano-Micro Letters 9 (3):31. https://doi.org/10.1007/s40820-017-0134-8.
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