期刊
ELECTROCHIMICA ACTA
卷 283, 期 -, 页码 1543-1550出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.07.091
关键词
Graphene oxide; Supercapacitors; Polypyrrole; Electrochemical exfoliation; Impedance spectroscopy
资金
- Suncheon National University
- Dongguk University-Seoul
A few-layer graphene oxide-based supercapacitor electrode was fabricated via direct and controlled electrochemical exfoliation of graphite in 0.1 MH2SO4 electrolyte. The graphite electrode exfoliated for a 5 min reaction shows the presence of a few layers of graphene oxide on the surface and exhibited excellent electrochemical performance with a maximum areal capacitance of 993 mF cm(-2). However, the electrode failed to retain its surface state under continuous charge/discharge cycles due to the subsequent exfoliation of graphene layers from the graphite surface. But, the deposition of a thin polypyrrole layer effectively reinforces the surface states of the electrode with better mechanical stability as well as electrochemical performances. The fabricated graphite/graphene oxide/polypyrrole electrode showed an improved areal capacitance of 1320 mF cm(-2). Moreover, the electrode exhibited similar to 83% cyclic stability after 5000 charge/discharge cycles, which is higher than the stability of graphite/graphene oxide electrode (C) 2018 Elsevier Ltd. All rights reserved.
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