1. Facile Synthesis of Microsphere Copper Cobalt Carbonate Hydroxides Electrode for Asymmetric Supercapacitor.
- Author
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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
- Subjects
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SUPERCAPACITORS , *COPPER compounds , *CARBONATES , *ASYMMETRY (Chemistry) , *CHEMICAL synthesis , *HYDROXIDES , *ELECTRODES - Abstract
Porous microspheres copper cobalt carbonate hydroxides (Cu x Co 2−x CH) pseudocapacitive electrode material comprised of nanoplates via a facile hydrothermal method were presented. Significantly, the crystalline structure, morphology and electrochemical performance of the Cu x Co 2−x CH can be readily manipulated by varying the Cu/Co molar ratios. Among various stoichiometries of Cu x Co 2−x CH porous microspheres studied, Cu 1.79 Co 0.21 CH 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 Cu 1.79 Co 0.21 CH 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 Cu 1.79 Co 0.21 CH materials on nickel foam (NF) as cathode electrode and graphene on NF as anode electrode in a 6 M KOH electrolyte. The asymmetric Cu 1.79 Co 0.21 CH/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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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