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利用粉末微电极恒电位阶跃法 ,研究了掺杂元素对球形 Ni(OH) 2 阳极过程和阴极过程质子扩散系数的影响 .结果表明 ,与纯 Ni(OH) 2 相比 ,掺 Co、Co+Zn、Ca后镍微电极的阳极过程质子扩散系数稍有增大 ,掺 Zn、Fe、Mg后则有所降低 ,而掺杂 Co、Ca后的阴极过程质子扩散系数增大约 1倍 ,掺杂 Fe、Mg后则减少约 3/4倍 ;掺 Cd对阳极和阴极过程的质子扩散系数影响均不大 .尽管掺杂元素对扩散层厚度的影响不大 ,但阴极过程扩散系数比阳极过程小约 2个数量级 ,将是影响阴、阳极电极电化学过程的重要因素 .
The effect of doping elements on the proton diffusion coefficient of the spherical Ni (OH) 2 anode and the cathode was investigated by potentiostatic step method of powder microelectrode.The results show that compared with pure Ni (OH) 2, Co, Co The proton diffusion coefficient of the Ni / Ni / Ni microelectrode increased slightly after adding Zn, Ca and Zn, but decreased after doped with Zn, Fe and Mg. The proton diffusion coefficient increased about 1 time after doped with Co and Ca, Doped Fe and Mg, about 3/4 times less than that of the original one. The effect of Cd doping on the proton diffusion coefficient of the anode and the cathode is not significant. Although the effect of doping elements on the diffusion layer thickness is not significant, Small about 2 orders of magnitude, will be an important factor affecting the electrochemical process of anodic and anodic electrodes.