Preparation of graphene/Co3O4 composites by hydrothermal method and their electrochemical properties

In this study, graphene/Co3O4 composites are prepared through a simple process under mild hydrothermal conditions. Sodium carbonate (Na2CO3) can produce many OH− and CO32− ions after dissolution and hydrolysis in a water–isopropanol system, thereby making it applicable as both depositing agent and r...

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Published inElectrochimica acta Vol. 95; pp. 139 - 145
Main Authors Huang, Shuo, Jin, Yuhong, Jia, Mengqiu
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.04.2013
Subjects
Capacitance
Co3O4
Density
Deposition
Feeding
Graphene
Graphite
Hydrolysis
Oxides
Supercapacitor
Supercapacitor
Graphene
Co3O4
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Summary:In this study, graphene/Co3O4 composites are prepared through a simple process under mild hydrothermal conditions. Sodium carbonate (Na2CO3) can produce many OH− and CO32− ions after dissolution and hydrolysis in a water–isopropanol system, thereby making it applicable as both depositing agent and reducing agent in the synthesis of graphene/Co2(OH)2CO3 composites. Remarkably, the galvanosta charge–discharge test shows that the specific capacitance value of the as-obtained composites reaches a high value of 443Fg−1 at a high current density of 5Ag−1, which is significantly improved in relation to Co3O4, and the capacitance retains 54% of capacitance at 60Ag−1. The fact that the specific capacitance remains 97.1% after 1000 continuous charge–discharge cycles at 10Ag−1 indicates that the as-prepared material has an excellent cycle life. The effect of the feeding ratios between Co3O4 and graphite oxide on the electrochemical performance has also been studied.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.01.045