Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 22, Pages 6812-6817Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.05.086
Keywords
Graphene; Mn3O4 nanoparticle; Nanocomposite; Cyclic voltammetry; Supercapacitor
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Funding
- Australian Research Council (ARC) [DP0772999, LP0989134]
- National Foundation of Korea through the WCU (World Class University) [R32-2008-000-20093-0]
- National Research Foundation of Korea [R32-2008-000-20093-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Australian Research Council [LP0989134] Funding Source: Australian Research Council
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Mn3O4/graphene nanocomposites were synthesized by mixing graphene suspension in ethylene glycol with MnO2 organosol, followed by subsequent ultrasonication processing and heat treatment. The as-prepared product consists of nanosized Mn3O4 particles homogeneously distributed on graphene nanosheets, which has been confirmed by field emission scanning electron microscopy and transmission electron microscopy analysis. Atomic force microscope analysis further identified the distribution of dense Mn3O4 nanoparticles on graphene nanosheets. When used as electrode materials in supercapacitors, Mn3O4/graphene nanocomposites exhibited a high specific capacitance of 175 Fg(-1) in 1 M Na2SO4 electrolyte and 256 Fg(-1) in 6M KOH electrolyte, respectively. The enhanced supercapacitance of Mn3O4/graphene nanocomposites could be ascribed to both electrochemical contributions of Mn3O4 nanoparticles, functional groups attached to graphene nanosheets, and significantly increased specific surface area. (c) 2010 Elsevier Ltd. All rights reserved.
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