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Co₃O₄ nanoplates; Co(OH)₂ nanoplates; reflux; supercapacitors.

Porous tricobalt tetraoxide (Co₃O₄) nanoplates with large aspect ratio have been obtained by annealing Co(OH)₂ precursor nanoplates synthesized by a facile reflux method without the need for any template or surfactant. After the heat treatment, the as-obtained phase-pure Co₃O₄ nanoplates with a wellretained structure were applied as the electrode material for supercapacitors, and the sample exhibits excellent performance with a high specific capacitance of 225 F g^–1 after 2000 charge–discharge cycles at 2 A g^–1, corresponding to a retention of 97% of the initial capacitance.

Tao Geng¹ Li Zhang¹ Hongyan Wang¹ Keying Zhang¹ Xia Zhou¹

1. Anhui Key Laboratory of Spin Electron and Nanomaterials, School of Chemistry and Chemical Engineering, Suzhou University, Suzhou, Anhui 234000, China

Published

September 2015

Manuscript received

6 January 2015

Accepted

2 June 2015