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ZnO nanowires (NWs) have been considered as a promising supporting material for hybrid supercapacitors due to its excellent mechanical property, good electronic conductivity and easy-fabrication. In this study, a high-performance supercapacitor based on Ni-Mn hydroxide modified ZnO NWs on carbon fiber (CF) was developed. The well-aligned ZnO NWs were synthesized on carbon fiber by chemical bath deposition, followed by pulse pulse electrodeposition of Ni-Mn hydroxide on the surface of ZnO NWs. The effects of the electrodeposition conditions as well as the Ni/Mn bath ratio were systematically investigated. The Ni-Mn hydroxide/ZnO NWs/CF composite electrode fabricated under the optimal deposition conditions has exhibited a large specific capacitance of 1039 F/g at 5 mV/s, but only ~68% retention after 3000 cycles. However, upon annealing at 200 ºC for 2 h, the retention of the electrode was largely enhanced up to 86%, probably due to the formation of Ni-Mn oxide.
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