以草酸为活化剂及沉淀剂,在泡沫镍基底上原位生长钴酸镍(NiCo2O4),再以NiCo2O4/泡沫镍复合材料为正极活性物质,活性炭为负极活性物质,组装不对称超级电容器(ASC)。采用XRD和SEM测试对NiCo2O4进行结构和形貌分析。得益于泡沫镍的三维网状结构、高导电性,以及NiCo2O4的纳米片状结构,NiCo2O4/泡沫镍复合材料呈现良好的电子和离子传输特性,具有优良的倍率性能和循环稳定性。在0～0.5V的电压范围和1A/g的电流下,NiCo2O4/泡沫镍复合材料的比电容达到514.22F/g,在10A/g时比电容仍有432.4F/g。该电容器在1mol/L KOH溶液中的工作电位窗口达到1.6V,当功率密度为4000W/kg时,能量密度达23.33Wh/kg;电容器在0～1.6V以2A/g恒流充放电(电压范围),第2000次循环的电容保持率为92%。
Nanosheet nickel cobaltite in-situ grown on nickel foam was prepared with oxalic acid as activator and precipitant for the first time.An asymmetric supercapacitor (ASC) was fabricated using the NiCo2O4/nickel foam material and active carbon as the positive and negative electrodes respectively.The structure and morphology of product were characterized by XRD and SEM.Benefited from the 3D network structure and high conductivity of nickel foam and in-suit grown nanosheet NiCo2O4,NiCo2O4/Nickel foam material exhibited good electron conductivity,efficient ion transport properties,excellent rate discharge performance and high cycling stability.The electrochemical results indicated that the specific capacitance of the material reached 514.22F/g,the energy density 23.33Wh/kg at power density of 4000W/kg with the working potential up to 1.6V at 1mol/L KOH.Furthermore,specific capacitance of the ASC device retained 92% at 2A/g in the voltage range of 0～1.6V after 2000 cycles.
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