Solvothermal synthesis of CoS<inf>2</inf>-graphene nanocomposite material for high-performance supercapacitors

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Journal Article
Journal of Materials Chemistry, 2012, 22 (31), pp. 15750 - 15756
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A CoS2-graphene nanocomposite was prepared by a facile solvothermal method. FESEM and TEM analyses have confirmed that CoS2nanoparticles with sizes of 5-15 nm are densely anchored on graphene nanosheets. The as-prepared nanocomposite was electrochemically tested as an electrode material for supercapacitors. The CoS2-graphene nanocomposite exhibited specific capacitances of 314 F g-1in the aqueous electrolyte and 141 F g-1in the organic electrolyte at a current rate of 0.5 A g-1with excellent cycling stability. The electrochemical performance of the nanocomposite has been significantly improved, compared to bare graphene nanosheets and CoS2nanoparticles. This could be credited to the 3D nanoarchitecture, in which CoS2nanoparticles were sandwiched between graphene nanosheets, and the additional electrochemical contribution of the decorated CoS2nanoparticles. © 2012 The Royal Society of Chemistry.
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