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 CoS 2-graphene nanocomposite was prepared by a facile solvothermal method. FESEM and TEM analyses have confirmed that CoS 2 nanoparticles 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 CoS 2-graphene nanocomposite exhibited specific capacitances of 314 F g -1 in the aqueous electrolyte and 141 F g -1 in the organic electrolyte at a current rate of 0.5 A g -1 with excellent cycling stability. The electrochemical performance of the nanocomposite has been significantly improved, compared to bare graphene nanosheets and CoS 2 nanoparticles. This could be credited to the 3D nanoarchitecture, in which CoS 2 nanoparticles were sandwiched between graphene nanosheets, and the additional electrochemical contribution of the decorated CoS 2 nanoparticles. © 2012 The Royal Society of Chemistry.
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