碱性介质中泡沫镍镀锌电极电化学行为的研究

Study on electrochemical performance of zinc-plated foam nickel electrode in alkaline solution

应用掠射式椭圆偏振技术 (掠射椭偏术 )和循环伏安法对以泡沫镍为基体的表面镀锌电极在碱性电解质 (KOH)中的电化学行为进行了研究。结果表明 :掠射椭偏术用于此类多孔电极体系的研究可以弥补反射式椭圆偏振技术的不足 ,显示出掠射式表面测试技术独特的优点 ;再者由于所研究的泡沫镍镀锌电极除具有较高的孔隙率和比表面外 ,还具有适当的活性 ,在电池充放电期间 ,负极上的锌能够得到充分的利用。而作为基体材料的镍在电解液中具有较高的稳定性 ,应用于碱性锌电池中不仅有利于改良电池的性能 ,而且作为蓄电池的负极材料有利于电极基体材料的回收和电极本身的再生。该研究结果为在碱性锌蓄电池中应用泡沫镍基材料制备锌负极和有效改善碱性锌电池的性能提供了依据。

Electrochemical performance of zinc-plated foam nickel electrode in alkaline solution (KOH) was stu-died by grazing ellipsometry and cyclic voltammetry. The results show that some characteristics are provided by the grazing ellipsometry to atone disavantages of reflective ellipsometry in study on multiple pore electrodes. During charge and discharge, zinc on negative electrode can be used fully because the electrode has large pore ratio and efficient surface, and zinc on the electrode possesses suitable activity. Nickel as basic material of the electrode is very stable in the electrolyte, and is advantageous to recovery and regeneration of the electrode.The results provide experimental foundation to apply zinc-plated foam nickel electrode in alkaline rechargeable battery.