低碳钢基体中离子注入镍和钼的电催化活性

THE ELECTROCATALYTIC ACTIVITY OF NICKEL AND MOLYBDENUM IMPLANTED IN MILD STEEL SUBSTRATES

离子注入不受相律和化学平衡的限制,也不受离子源和基体种类的约束,注入离子的能量和剂量精确可控,因而它是实现材料表面改性最有效的方法之一.自Grenness等发现注铂的钨电极,对H^+还原的电催化性能与纯铂接近之后,Wolf等将注入的Pt/RuO_2、Pt/C、Pt/WC电极用于H^+、O_2的电化学还原及甲酸的电化学氧化,其催化活性和稳定性均优于光滑的纯铂电极、Thompson等在钛基上注铂,用于催化析氢也得到类似的效果。近期文献报导,用热处理或电沉积方法制备的Ni-Mo、Ni-Mo-V

Ion implantation method was used for the doping of mild steel substrates with Ni and Mo. The mild steel was bombarded with 1×10^(16) ions·cm^(-2) of Ni and Mo. Theresulting catalysts were tested with respect to their activity for the electrochemicalH^+-reduction. The results indicate that implanted mild steel exhibit low hydrogenovervoltage (130～160mV, 20～60A·dm^(-2) in 30 wt% KOH at 25℃) and excellentstability. The Ni and Mo bombardments lead to a much more active in comparisonwith untreated mild steel. Ion beam mixing is less effective than ion implantationin this case. By XPS the shifts of electron bonding energies for Ni_(2p) and Mo_(3d)were observed for implanted mild steel with respect to the corresponding Ni andMo. The eleetrocatalytic activity of implanted substrates was explained provisionallyby an interaction between implanted metals in mild steel.