Solvothermal synthesis of CoS2–graphene nanocomposite material for high-performance supercapacitors

Bei Wang; Jinsoo Park; Dawei Su; Chengyin Wang; Hyojun Ahn; Guoxiu Wang

doi:10.1039/C2JM31214J

Solvothermal synthesis of CoS₂–graphene nanocomposite material for high-performance supercapacitors†

Bei Wang,^a Jinsoo Park,^b Dawei Su,^a Chengyin Wang,^c Hyojun Ahn^b and Guoxiu Wang*^ab

* Corresponding authors

^a Centre for Clean Energy Technology & School of Chemistry and Forensic Science, University of Technology Sydney, City Campus, Broadway, Sydney 2007, Australia
E-mail: Guoxiu.Wang@uts.edu.au
Fax: +61 2 95141460
Tel: +61 2 95141741

^b School of Materials Science and Engineering, Gyeongsang National University, 900 Gazwa-dong, Jinju, Gyeongnam 660-701, South Korea

^c College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

Abstract

A CoS₂–graphene nanocomposite was prepared by a facile solvothermal method. FESEM and TEM analyses have confirmed that CoS₂ 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 CoS₂–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 CoS₂ nanoparticles. This could be credited to the 3D nanoarchitecture, in which CoS₂ nanoparticles were sandwiched between graphene nanosheets, and the additional electrochemical contribution of the decorated CoS₂ nanoparticles.

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Article information

DOI: https://doi.org/10.1039/C2JM31214J
Article type: Paper
Submitted: 27 Feb 2012
Accepted: 13 Jun 2012
First published: 18 Jun 2012

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J. Mater. Chem., 2012,22, 15750-15756

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Solvothermal synthesis of CoS₂–graphene nanocomposite material for high-performance supercapacitors

B. Wang, J. Park, D. Su, C. Wang, H. Ahn and G. Wang, J. Mater. Chem., 2012, 22, 15750 DOI: 10.1039/C2JM31214J

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