高析氢催化活性和稳定性的纳米晶Ni-Fe-Mo-Co合金

High catalytic activity for hydrogen evolution and stability of nanocrystalline Ni-Fe-Co-Mo alloy

在酸性柠檬酸盐-氯化物体系中电沉积得到铁族金属与钼多元合金,通过SEM、XRD和EDS对合金的表面形貌、微观结构和组成进行分析,结果表明Ni-Fe-Mo-Co电极为纳米晶,晶粒尺寸为3.7nm;电解后电极表面呈现"蜂窝"型网孔结构,平均孔径约50nm,具有很大的真实表面积和机械稳定性。通过比较不同的铁族金属与钼合金电极在30%KOH溶液中的催化性能,表明在Ni-Fe-Mo三元合金中引入Co能进一步提高合金的催化活性。纳米晶Ni-Fe-Mo-Co合金电极在80℃和200mA/cm2时,过电位为66.2mV,与其它铁族金属与钼合金电极相比较,其显示出更高的催化活性。长期和间断电解实验,说明纳米晶Ni-Fe-Mo-Co合金电极具有良好的催化稳定性能。

Iron-group with molybdenum alloys were electrodeposited in acid citrate-chloriae Path. The surface morphology, microstructure and composition of alloy electrodes were analyzed by SEM, XRD and EDS techniques. The results show that Ni-Fe-Mo-Co alloy is nanocrystalline and the crystalline grain size of alloy is 3.7 nm. The surface morphology of Ni-Fe-Mo-Co alloy electrode after electrolysis is a hive-like structure with very large real surface area and mechanical stability, the average size of pore was about 50nm. The catalytic activity of the different alloys in 30% KOH solution indicated that the catalytic activity of Ni-Fe-Mo alloy was improved by adding Co it. The Ni-Fe-Mo-Co alloy electrode which the overpotential was 66.2mV in 30%KOH solution at 200mA/cm^2 and 80℃ had the better catalytic activity than the other iron-group with Mo alloy electrodes. The stability of Ni-Fe-Mo-Co alloy under open circuit condition and continuous electrolysis was very encouraging.