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

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• 作者：Shude Liu^a ; K.S. Hui^b ; ^{kshui@hanyang.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; K.N. Hui^c ; ^{bizhui@umac.mo" class="auth_mail" title="E-mail the corresponding author} ; Vijaykumar V. Jadhav^a ; ^e ; Qi Xun Xia^a ; Je Moon Yun^d ; Y.R. Cho^a ; Rajaram S. Mane^e ; Kwang Ho Kim^a ; ^d ; ^{kwhokim@pusan.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Asymmetric supercapacitor ; Hydrothermal method ; Copper cobalt carbonate hydroxide ; Microsphere ; Nanoplate
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 January 2016
• 年：2016
• 卷：188
• 期：Complete
• 页码：898-908
• 全文大小：3059 K

文摘

Porous microspheres copper cobalt carbonate hydroxides (Cu_xCo_2−xCH) pseudocapacitive electrode material comprised of nanoplates via a facile hydrothermal method were presented. Significantly, the crystalline structure, morphology and electrochemical performance of the Cu_xCo_2−xCH can be readily manipulated by varying the Cu/Co molar ratios. Among various stoichiometries of Cu_xCo_2−xCH porous microspheres studied, Cu_1.79Co_0.21CH 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 Cu_1.79Co_0.21CH 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 Cu_1.79Co_0.21CH materials on nickel foam (NF) as cathode electrode and graphene on NF as anode electrode in a 6 M KOH electrolyte. The asymmetric Cu_1.79Co_0.21CH/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.