低碳钢基体中离子注入镍和钼的电催化活性

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 合金电极有很低的析氢超

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

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. The resulting catalysts were tested with respect to their activity for the electrochemical H~+-reduction. The results indicate that implanted mild steel exhibit low hydrogen overvoltage (130～160 mV, 20～60 A·dm~(-2) in 30 wt% KOH at 25 ℃) and excellent stability. The Ni and Mo bombardments lead to a much more active in comparison with untreated mild steel. Ion beam mixing is less effective than ion implantation in 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 and Mo. The electrocatalytic activity of implanted substrates was explained provisionally by an interaction between implanted metals in mild steel.