电沉积多孔复合Ni-P/LaNi_5电极及其析氢电催化性能  

Electro-Deposition of the Porous Composite Ni-P/LaNi_5 Electrode and Its Electro-Catalytic Performance toward Hydrogen Evolution Reaction

作　　者：段钱花[1] 王森林[1] 王丽品[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》2013年第1期123-130,共8页Acta Physico-Chimica Sinica

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).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 AI 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/LaNis electrodes is 35.44 kJ. mo1-1, which is lower than that of the porous Ni-P （50.91 kJ. mol-1）.

关 键 词：电沉积 NI-P LANI5 析氢反应 电催化 多孔复合电极 

分 类 号：O646.54[理学—物理化学]