Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 23, Pages 6973-6978Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.06.081
Keywords
Microwave-assisted; Graphene nanosheets; Cobalt oxide; Supercapacitor
Categories
Funding
- Chinese Ministry of Education [106011]
- Fundamental Research Funds for the Central Universities [HEUCF101006]
- Key Project of National High-Tech Research and Development Plan of China [2008AA03A186]
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Graphene nanosheet (GNS)/Co3O4 composite has been rapidly synthesized by microwave-assisted method. Field emission scanning electron microscopy and transmission electron microscopy observation reveals the homogeneous distribution of Co3O4 nanoparticles (3-5 rim in size) on graphene sheets. Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 243.2 g(-1) has been obtained at a scan rate of 10 mV s(-1) in 6 M KOH aqueous solution for GNS/Co3O4 composite. Furthermore, the composite exhibits excellent long cycle life along with similar to 95.6% specific capacitance retained after 2000 cycle tests. (C) 2010 Elsevier Ltd. All rights reserved.
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