Ni-MOF衍生的NiMoO4材料的超电容性能

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...

Super-capacitive performance of Ni-MOF-derived NiMoO4 electrode materials

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.