Ni-Mo/LaNi5多孔复合电极的制备及其电催化析氢性能

摘要

A Ni-Mo/LaNi5 porous composite electrode was successfully prepared by composite electrodeposition and dissolution with a concentrated alkali solution. We found that the electrode consisted of two phases and a porous structure using scanning electron microscopy (SEM) and X-ray diffraction (XRD).In a 20％ (w) NaOH solution the electrocatalytic properties toward hydrogen evolution reaction (HER) of the electrode was evaluated using electrochemical steady-state polarization curve and electrochemical impendence spectroscopy (EIS). As a result, the porous composite electrode had good eiectrocatalytic activity toward HER. We also found that the control step in the HER was the electrochemical de-absorption of hydrogen. The stability of the porous composite electrode was investigated by cycle voltammetry,discontinuity constant potential electrolysis over a long time, and differential scanning calorimetry (DSC).The results show that the stability of the porous composite electrode is good.%用复合电沉积及碱液溶解法制备了Ni-Mo/LaNi5多孔复合电极.运用扫描电镜和X射线衍射表征了复合电极的多孔两相复合结构.在20%(w)NaOH溶液中,采用稳态极化、电化学阻抗技术研究了NI-Mo/LaNi5多孔复合电极的电催化析氢性能,电化学脱附为整个反应的控制步骤.用循环伏安、长时间间断电解和差示扫描量热实验评价了该电极的稳定性能.结果表明,含有LaNi5的多孔复合电极的电催化性能得到了提高,并且具有优异的抗断电性能.