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

Liu, Shude, Hui, K. S., Hui, K. N., Jadhav, Vijaykumar V., Xia, Qi Xun, Yun, Je Moon, Cho, Y. R., Mane, Rajaram S. and Kim, Kwang Ho (2016) Facile Synthesis of Microsphere Copper Cobalt Carbonate Hydroxides Electrode for Asymmetric Supercapacitor. Electrochimica Acta, 188. pp. 898-908. ISSN 0013-4686

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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.

Item Type: Article
Uncontrolled Keywords: asymmetric supercapacitor,copper cobalt carbonate hydroxide,hydrothermal method,microsphere,nanoplate
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: Pure Connector
Date Deposited: 09 Nov 2016 15:00
Last Modified: 22 Apr 2020 01:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/61293
DOI: 10.1016/j.electacta.2015.12.018

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