化学复合镀Ni-Co-P对贮氢合金电化学性能影响

Effect of surface treatment on Ni-Co-P electrochemical depositing of hydrogen storage alloy

在不同反应温度下,在A2B7型La1.5Mg0.5Ni6.5Co0.5贮氢合金表面化学沉积Ni-Co-P,研究了沉积前后合金电极的电化学性能。结果表明:与未处理相比,沉积处理后合金电极活化次数、高倍率放电性能、交换电流密度和极限电流密度率均得到明显的提高,且随着反应温度的升高而增大。合金电极循环寿命也在一定程度均好于未包覆的。表明化学沉积Ni-Co-P能有效地提高贮氢合金电极电化学性能。

The electrochemical properties of A2BT-type hydrogen storage alloy Lal.5Mgo.5Ni6.sCoo.5 with Ni-Co-P electroless-deposition by the different reaction temperatures and without it were studied. The results show that the microencapsulated hydrogen storage alloy electrodes lead to some increase in the activation number, high-rate discharge ability, exchange current density and limiting current density with increasing reaction temperature. The Ni-Co surface microencapsulation has a little effect on the cyclic stability. All of the above indicate that the Ni-Co-P electrochemical depositing method can effectively improve the electrochemical performance of hydrogen storage alloy electrodes.