现场椭偏术研究钴离子注入对碱性镍电极的影响

为了提高镍电极表面活性物质的利用率和深入认识镍电极的性能,应用光谱电化学研究方法——椭圆偏振光现场测试技术研究了碱性溶液中镍电极的性质.讨论了充电电流与放电电流以及钻离子注入对碱性镍电极性能的影响.实验结果表明:在表面层中注入钴离子后,可以改良在碱性镍电极表面形成活性物质层的均匀性,形成较厚的表面活性物质层,提高碱性镍电极表面氧化层的钝化性能,若对碱性镍电极施以较大的阳极极化电流,表面上注入的钴离子能够在充电过程中使更多的Ni(OH)_2转化到NiOOH,从而提高了碱性镍电极的容量.文中还介绍了椭圆偏振技术应用于现场电极反应研究的优越性.

In-situ elliptic polarization studies on the effect of cobalt implantation on the behavior of nickel electrode

The behaviors of nickel electrode in alkaline solution have been studied with spectroelec-trochemical in-situ ellipsometry to raise utilization of active material and to understand properties of the electrode deeply. Effects of charge and discharge currents as well as cobalt implantation have been discussed. The experimental results indicated that with cobalt ion implantation, uniformity of active material layer on the electrode was improved,thickness of active material layer and passivity of nickel electrode increased,also, the amount of NiOOH transferred from Ni(OH)2 during charge under larger current was increased and capacity of nickel electrode was raised. Advantages of in-situ ellipsometry are introduced in this paper.