期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 1, 期 9, 页码 1135-1142出版社
AMER CHEMICAL SOC
DOI: 10.1021/sc400055z
关键词
Cobalt hydroxide; Graphene; Specific capacitance; Supercapacitor
资金
- UGC INDIA
In this paper, our work deals with the preparation of cetyl trimethylammonium bromide (CTAB)assisted hexagonal platelet beta Co(OH)(2) via a simple hydrothermal process and its graphene-based hybrid composite with improved electrochemical properties. The prepared materials were successfully characterized by FTIR, XRD, FESEM, TEM, and TGA analysis. The materials were subjected to electrochemical analysis by a three electrode system in a 6 M KOH electrolyte in terms of a cyclic voltammetry, cyclic charge-discharge, and electrochemical impedance study. The CTAB-assisted Co(OH)(2) with hexagonal architecture exhibited the highest specific capacitance of 312 F/g at a 2 mV/s scan rate and 285 F/g at a 2 A/g constant discharge current density. The high utility of pseudocapacitive Co(OH)(2) is achieved only in its graphene-based hybrid composite, which responded with specific capacitance of 532 F/g at a 2A/g current density and a 94% specific capacitance retention over 500 charge discharge cycles.
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