NiCo_(2)O_(4)@PANI复合材料的制备及其电化学性能研究

Preparation and electrochemical performance of NiCo_(2)O_(4)@PANI composites

通过水热处理及电化学沉积,在集流体泡沫镍上原位生长出NiCo_(2)O_(4)@PANI复合材料.通过扫描电镜观察到泡沫镍上均匀分布着表面粗糙的纳米棒阵列,这种结构有利于电极材料与电解液的充分接触与反应;PANI(聚苯胺)的包覆增加了NiCo_(2)O_(4)的导电性,降低了载流子传输的活化能,因而表现出优异的电化学性能.在1 mA·cm^(-2)的电流密度下,复合材料的比电容为2307.15 F·g^(-1).当电流密度提升到20 mA·cm^(-2)后,比电容的保留率为78.13%.在10 mA·cm^(-2)电流密度下,循环2000次后,比电容保留率为85.46%.测试结果证明该复合材料作为电极材料,在超级电容器的应用中有着巨大的潜力.

A facile hydrothermal method and subsequent electrodeposition process were carried out to form NiCo_(2)O_(4)@PANI composite materials on the surface of foam nickel directly.The morphology and microstructure of materials were observed by scan electron microscopy.It is found that a nanorod array with a rough surface uniformly grown on the surface of nickel foam,improving the contact and reaction between the electrode materials and the electrolyte.The coating of PANI(polyaniline)also enhanced the conductivity of NiCo_(2)O_(4),decreasing the active energy of carrier transport.The as-prepared material shows excellent electrochemical performance as supercapacitor electrode material.At a current density of 1 mA·cm^(-2),the specific capacitance of the composite can reach 2307.15 F·g^(-1).When the current density is increased to 20 mA·cm^(-2),the retention rate of specific capacitance is 78.13%.At the current density of 10 mA·cm^(-2),after 2000 cycles,the retention rate of specific capacitance is 85.46%.The test results imply the composite material,as an electrode material,has great potential in the application of supercapacitors.