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 35.44 kJ·mol -1 , 低于多孔 Ni-P 的值(50.91 kJ·mol -1 ). Abstract: The composite Ni-P/(LaNi5+Al) coating was plated by the composite electro-deposition. Then, the porous composite Ni-P/LaNi5

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... oating 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 ).