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

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

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.

Suggested Citation

  • Mei, Junfeng & Fu, Wenbin & Zhang, Zemin & Jiang, Xiao & Bu, Han & Jiang, Changjun & Xie, Erqing & Han, Weihua, 2017. "Vertically-aligned Co3O4 nanowires interconnected with Co(OH)2 nanosheets as supercapacitor electrode," Energy, Elsevier, vol. 139(C), pages 1153-1158.
    • Handle: RePEc:eee:energy:v:139:y:2017:i:c:p:1153-1158
    DOI: 10.1016/j.energy.2017.08.014
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    References listed on IDEAS

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    1. Pal, Monalisa & Rakshit, Rupali & Singh, Ashutosh Kumar & Mandal, Kalyan, 2016. "Ultra high supercapacitance of ultra small Co3O4 nanocubes," Energy, Elsevier, vol. 103(C), pages 481-486.
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    5. Hong, Wei & Wang, Jinqing & Li, Zhangpeng & Yang, Shengrong, 2015. "Fabrication of Co3O4@Co–Ni sulfides core/shell nanowire arrays as binder-free electrode for electrochemical energy storage," Energy, Elsevier, vol. 93(P1), pages 435-441.
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