【摘要】 开发可控的NiMoO₄纳米结构合成方法是获得高性能赝电容器电极材料的关键。以Ni-MOF为前驱体，采用模板转化法合成NiMoO₄纳米球，以改善其结构并提升电化学性能。采用XRD、FTIR和SEM对所制备的NiMoO₄样品的结构和形貌进行表征，并通过氮气吸脱附表征了其孔径和比表面积。MOF衍生的NiMoO₄纳米球由超薄的纳米片状结构组成，这为电解质的渗透提供了有利的路径。在1 mol/L KOH水溶液的三电极体系中测试样品的电化学性能。当电流密度为1 A·g^-1时，比电容高达1116 F·g^-1。NiMoO₄纳米球具有高比电容和优异的倍率性能，这归功于其大的比表面积和高电导率。以NiMoO₄样品为正极，活性炭（AC）为负极制备的非对称超级电容器具有长期循环稳定性，经4000次循环(5 A·g^-1)后的容量保持率为84.6%。更多还原

【Abstract】 It is essential to develop new and feasible synthetic methods for predictively controlling the nanostructures of NiMoO₄ to obtain high performance pseudocapacitor electrode materials. In this work, we developed a two-step solvothermal method to synthesize NiMoO₄ nanospheres using a nickel metal-organic framework（Ni-MOF） as templates to improve their structure and electrochemical properties. The structure and morphology of the as-prepared NiMoO₄ samples were characterized by XRD, FTIR and SEM, and the pore size and specific areas were compared by nitrogen adsorption/desorption method. It was found that the MOF-derived NiMoO₄ nanospheres was composed of ultrathin nanosheets, leading to more favorable paths for electrolyte penetration. The electrochemical performance of the samples was tested in a three-electrode system with 1 mol/L KOH aqueous solution. A specific capacitance of 1116 F·g^-1 was measured at the current density of 1 A·g^-1. The NiMoO₄ nanospheres exhibited high specific capacitance and excellent rate capability, which were attributed to their large surface area and high electrical conductivity. Furthermore, we fabricated an asymmetric supercapacitor using the NiMoO₄ samples and activated carbon（AC） as the positive and negative electrode respectively, which sustained a long-term cycling stability with capacitance retention of 84.6% after 4000 cycles at the current density of 5 A·g^-1.更多还原