Vertically-aligned Co3O4 nanowires interconnected with Co(OH)2 nanosheets as supercapacitor electrode

Junfeng Mei, Wenbin Fu, Zemin Zhang, Xiao Jiang, Han Bu, Changjun Jiang, Erqing Xie and Weihua Han

Energy, 2017, vol. 139, issue C, 1153-1158

Abstract: Three-dimensional (3D) hierarchical nanostructure consisting of vertically-aligned Co3O4 nanowires and Co(OH)2 nanosheets have been successfully prepared by a two-step wet chemical method. In this structure, the Co3O4 nanowires were wrapped and interconnected with ultrathin Co(OH)2 nanosheets and combined into a whole network. The Co3O4/Co(OH)2 3D network nanostructure shows a high specific capacitance of 867 F/g at a current density of 2 A/g, and a satisfied cycling stability with 84.5% capacitance retention after 5000 cycles. An asymmetric supercapacitor with the Co3O4/Co(OH)2 and activated carbon was also assembled by using 2 M KOH as electrolyte. The supercapacitor shows a wide potential window of 0–1.5 V, and the energy density can reach 25.6 W h kg−1 at a power density of 939.03 W kg−1. Our work has proposed a new strategy to improve the electrode performance of electrochemical supercapacitors by rationally building three-dimensional nanomaterial network with nanowires and nanosheets.

Keywords: Electrochemical supercapacitor; Cobalt oxide nanowire; Cobalt hydroxide nanosheet; 3D network nanostructure (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:139:y:2017:i:c:p:1153-1158

DOI: 10.1016/j.energy.2017.08.014

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