【摘要】 采用复合电沉积制备了Ni-P/(LaNi5+Al)复合镀层,然后将镀层浸泡在浓碱液中除铝,成功得到多孔复合Ni-P/LaNi5电极.通过扫描电镜(SEM)、能谱分析(EDS)和X射线衍射(XRD)仪等技术表征了电极的表面形貌、组成和相结构.运用电化学线性伏安扫描(LSV)、恒电位电解、电化学阻抗谱(EIS)等手段研究了电极在20%(w)NaOH溶液中的析氢反应(HER)电催化性和稳定性.结果表明,与多孔Ni-P电极相比,多孔复合Ni-P/LaNi5电极具有低的析氢过电位、高的比表面积和高的稳定性能;多孔Ni-P/LaNi5电极的析氢反应的表观活化自由能为35.44kJ·mol-1,低于多孔Ni-P的值(50.91kJ·mol-1).更多还原

【Abstract】 The composite Ni-P/(LaNi5 +Al) coating was plated by the composite electro-deposition.Then,the porous composite Ni-P/LaNi5 coating was successfully prepared by dissolution Al with the concentrated alkali solution.The composition and structure of the coating were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS),and X-ray diffraction (XRD).In 20% (w) NaOH solution,the electro-catalytic and stable properties for hydrogen evolution reaction (HER) of the porous composite Ni-P/LaNi5 electrode were evaluated by electrochemical linear voltammetric scanning (LSV),constant potential electrolysis,and electrochemical impedance spectroscopy (EIS).As a result,the porous composite electrode exhibits a lower over-potential for HER,a higher specific surface area,and a better stabilization than that of the porous Ni-P electrode.The apparent activation energy for HER on the porous composite Ni-P/LaNi5 electrodes is 35.44 kJ · mol-1,which is lower than that of the porous Ni-P (50.91 kJ·mol-1).更多还原