Facile Synthesis of Microsphere Copper Cobalt Carbonate Hydroxides Electrode for Asymmetric Supercapacitor

Shude Liu, K. S. Hui, K. N. Hui, Vijaykumar V. Jadhav, Qi Xun Xia, Je Moon Yun, Y. R. Cho, Rajaram S. Mane, Kwang Ho Kim

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108 Citations (Scopus)

Abstract

Porous microspheres copper cobalt carbonate hydroxides (CuxCo2-xCH) pseudocapacitive electrode material comprised of nanoplates via a facile hydrothermal method were presented. Significantly, the crystalline structure, morphology and electrochemical performance of the CuxCo2-xCH can be readily manipulated by varying the Cu/Co molar ratios. Among various stoichiometries of CuxCo2-xCH porous microspheres studied, Cu1.79Co0.21CH consisted of nanoplates with a mean thickness of ∼35 nm showed a high specific capacitance of 789 F g-1 at a current destiny of 1 A g-1 and good rate ability. Furthermore, the optimized Cu1.79Co0.21CH electrode also exhibited remarkable high cycling stability, ca 77.5% after 3000 charge/discharge cycles at current density of 5 A g-1. An asymmetric device was constructed from optimized Cu1.79Co0.21CH materials on nickel foam (NF) as cathode electrode and graphene on NF as anode electrode in a 6 M KOH electrolyte. The asymmetric Cu1.79Co0.21CH/NF//graphene/NF supercapacitor device delivered a specific capacitance of 60.5 F g-1 in a potential range of 0-1.6 V. A high energy density of 21.5 W h kg-1 was achieved at the power density of 200 W kg-1. More significantly, the designed device exhibited excellent cycling stability with 73.3% capacity retention after 5000 cycles.

Original languageEnglish
Pages (from-to)898-908
Number of pages11
JournalElectrochimica Acta
Volume188
Early online date4 Dec 2015
DOIs
Publication statusPublished - 10 Jan 2016

Keywords

  • Asymmetric supercapacitor
  • Copper cobalt carbonate hydroxide
  • Hydrothermal method
  • Microsphere
  • Nanoplate

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