Ni-Mo/LaNi_5多孔复合电极的制备及其电催化析氢性能  

Preparation and Electrocatalytic Performance of Ni-Mo/LaNi_5 Porous Composite Electrode toward Hydrogen Evolution Reaction

作　　者：王森林[1] 张艺[1] 

机构地区：[1]华侨大学材料科学与工程学院应用化学系,福建厦门361021

出　　处：《物理化学学报》2011年第6期1417-1423,共7页Acta Physico-Chimica Sinica

摘　　要：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.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 electrocatalytic 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.

关 键 词：Ni-Mo/LaNi5 多孔复合电极 复合电沉积 析氢反应 稳定性 

分 类 号：O646.54[理学—物理化学]