二元金属Ni-Fe磷化物制备和电催化性能研究

Preparation and electrocatalytic performance of bimetallic Ni⁃Fe phosphide

使用硫酸镍、硝酸亚铁、次亚磷酸钠和柠檬酸钠在泡沫镍为载体的基底上,采用电沉积方法制备出Ni-Fe磷化物电催化剂,通过SEM测试表征催化剂的结构及形貌,使用EDS能谱仪对样品表面的元素分布,并通过电化学测试催化剂的析氧和析氢及催化活性等参数.结果表明:在10 mA/cm^(2)电流密度下,Ni-Fe磷化物过电位为232 mV,在-10 mA/cm^(2)电流密度下过电位为162 mV;Ni-Fe磷化物的催化活性面积(Cdl)为30.7 mF/cm^(2),相较于Ni磷化物和Fe磷化物的过电位及活性催化面积均有所提升.

Ni⁃Fe phosphiteelectrocatalyst was prepared by electrodeposition using nickel sulfate,ferrous nitrate,sodi⁃um hypophosphite and sodium citrate on the substrate supported by nickel foam.The structure and morphology of the catalyst were characterized by SEM test,the distribution of elements on the surface of the sample was measured by EDS spectrometer,and the parameters of oxygen evolution,hydrogen evolution and catalytic activity of the cata⁃lyst were tested by electrochemistry.The results show that the overpotential of Ni⁃Fe phosphide is 232 mV at 10 mA/cm^(2) current density and 162 mV at⁃10 mA/cm^(2) current density.The catalytic active area(Cdl)value of Ni⁃Fe phosphide is 30.7 mF/cm^(2),which is higher than that of Ni phosphide and Fe phosphide.