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A Facile Method to Prepare Three‐Dimensional Fe 2 O 3 /Graphene Composites as the Electrode Materials for Supercapacitors
Author(s) -
Wu Jifeng,
Zhou Anan,
Huang Zhifeng,
Li Lei,
Bai Hua
Publication year - 2016
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201500700
Subject(s) - graphene , supercapacitor , oxide , capacitance , electrode , electrolyte , composite material , graphene foam , saturated calomel electrode , chemistry , materials science , graphene oxide paper , chemical engineering , nanotechnology , working electrode , organic chemistry , engineering
Metal oxides comprise an important class of electrode materials for supercapacitors. In this paper, we report the preparation of three‐dimensional (3D) Fe 2 O 3 /chemically converted graphene composites and their application in supercapacitors. The composites are synthesized via a one‐step reaction between graphene oxide and Fe 2+ at a mild condition. During the reaction graphene oxide sheets are reduced and self‐assemble into a 3D network, while Fe 2+ is converted into Fe 2 O 3 and deposited onto the graphene network. This structure facilitates the diffusion of the electrolyte and the electron transfer between Fe 2 O 3 and the current collector, thus endows the composites with high capacitive performance. A high specific capacitance of 264 F·g −1 (2.5 A·g −1 ) at the working potential of 0–−1 V vs. saturated calomel electrode is achieved on the Fe 2 O 3 /chemically converted graphene composites. Meanwhile, the composites show good cycling stability, with capacitance retention of 95.7% after 5000 cycles. This work provides a facile method to fabricate cathode materials for asymmetric supercapacitors.