NiCoTe_(2)电极材料制备及其电化学性能研究

Preparation of NiCoTe_(2) electrode material andelectrochemical performance study

采用二次水热合成方法,以硝酸钴、硝酸镍、氟化铵,尿素为原材料,二氧化碲为碲源,泡沫镍为基底制备NiCoTe_(2)电极材料。利用XRD、SEM分别对材料结构和形貌进行了表征,并使用循环伏安测试、恒流充放电测试和交流阻抗测试进行了材料的电化学性能研究。结果表明,随着水热温度的增加,电极材料的纳米针/棒状形貌直径变大,并且有纳米颗粒附着表面,增加了电极材料与电解液接触的表面积和活性位点的暴露;当水热温度为140℃时制备的材料电化学性能最佳,电极材料内阻为0.63Ω,当电流密度为1 A/g时,质量比电容可达到781.5 F/g。

Using cobalt nitrate,nickel nitrate,ammonium fluoride and urea as raw materials,tellurium dioxide as tellurium source and foam nickel as substrate,NiCoTe_(2) electrode materials were prepared by secondary hydrothermal synthesis method.The material structure and morphology were characterized using XRD and SEM,and the electrochemical performance of the material was studied using cyclic voltammetry,constant current charge discharge testing,and AC impedance testing.The results showed that with the increase of hydrothermal temperature,the diameter of the nanoneedle/rod-shaped morphology of the electrode material increased,and nanoparticles adhered to the surface,increasing the surface area of the electrode material in contact with the electrolyte and the exposure of active sites;The material prepared at a hydrothermal temperature of 140℃exhibits the best electrochemical performance,with an internal resistance of 0.63Ωfor the electrode material.When the current density is 1A/g,the mass specific capacitance can reach 781.5 F/g.