稀土铈对镍-钴-磷合金电极的析氢催化性能的影响

Effect of Cerium on Catalytic Property of Ni-Co-P Alloy for Hydrogen Evolution Reaction

采用自行研制的复合配合剂,用化学沉积法在酸性体系中制备了Ni-Co-P和Ni-Co-P稀土合金电极。研究了稀土元素铈对Ni-Co-P合金电极的析氢电催化活性和电化学稳定性的影响。通过电化学方法测定合金电极在7mol/LKOH溶液中的阴极极化曲线、Tafel曲线和电化学稳定性曲线,结果表明,与Ni-Co P合金电极相比,Ni-Co-P(RE)合金电极的析氢电位正移约90mV,Ni-Co-P(RE)合金电极具有较优的析氢电催化活性和电化学稳定性。此外,还通过X射线衍射、扫描电镜和合金镀层成分分析,结果表明,稀土元素铈的加入使非晶态Ni-Co-P合金镀层晶粒细化,但稀土元素铈不与合金共沉积,只是起到改变镀层组织结构的作用。

Ni-Co-Pand Ni-Co-P-Realloy electrodes were prepared in acidic solution by chemical deposition with self- made composite complex. The effects of rare earth cerium on the catalytic activity and electrochemical stability of Ni-Co-P alloy electrode for hydrogen evolution reaction were studied. Cathodic polarization curves, Tafel curves and electrochemical stabilities of alloy electrodes were tested in 7 mol/L KOH solution by electrochemical technology. Resuhs show that the hydrogen evolution potential of Ni- Co- P- Re alloy electrode moves positively about 90 mV, and Ni - Co- P- Re electrode has better catalytic, activity of hydrogen evolution and better electrochemical stability than Ni- Co- P electrode. Moreover the results of XRD,SEM and component analysis of alloy coating show that rare earthcerium makes the crystal of amorphous Ni- Co- P coating fine,and cerium do not co-deposit with alloy but changes the structureof alloy coating.