A high-performance asymmetric supercapacitor based on Co(OH)2/graphene and activated carbon electrodes

A high-performance asymmetric supercapacitor has been fabricated using graphene supported Co(OH)2 nanosheet (Co(OH)2/GNS) as the positive electrode and carbon fiber paper supported activated carbon (AC/CFP) as the negative electrode in KOH aqueous electrolyte, respectively. The asymmetric supercapac...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2016-12, Vol.782, p.98-102
Main Authors: Zhao, Cuimei, Ren, Fang, Xue, Xiangxin, Zheng, Weitao, Wang, Xin, Chang, Limin
Format: Article
Language:English
Subjects:
Activated carbon
Aqueous electrolytes
Asymmetric supercapacitor
Asymmetry
Capacitance
Carbon fibers
Cobalt hydroxide
Cycles
Density
Electrode materials
Electrodes
Energy
Flux density
Graphene
Graphene nanosheet
Nanotubes
Stability
Studies
Supercapacitors
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Summary:A high-performance asymmetric supercapacitor has been fabricated using graphene supported Co(OH)2 nanosheet (Co(OH)2/GNS) as the positive electrode and carbon fiber paper supported activated carbon (AC/CFP) as the negative electrode in KOH aqueous electrolyte, respectively. The asymmetric supercapacitor exhibits a significantly improved capacitive performance in comparison with that of the symmetric supercapacitors fabricated with Co(OH)2/GNS or AC/CFP as the electrodes. The improvement is attributed a high conductivity and reversibility of electrode materials, leading to the large specific capacitance and broadened potential window, resulting in a high energy density (19.3Whkg−1 at a power density of 187.5Wkg−1), excellent power density (3000Wkg−1 at an energy density of 16.7Whkg−1) and long-term cycling stability (after 20000cycles, initial capacitance remains well). These encouraging results make these low-cost and eco-friendly materials promising for applications in asymmetric supercapacitors with high energy density, power delivery and cycling stability. •We report a simple method for the preparation of high-performance ASC.•The ASC shows high specific capacitance and wide operational voltage.•The ASC shows long-term cycling stability for 20000cycles.•The good performance is related to synergistic effect between two electrodes.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2016.10.023