脉冲电沉积镍-钨-铁-镧纳米晶合金镀层的电催化析氢性能  

Electrocatalytic Hydrogen Evolution Properties of Nanocrystalline Ni-W-Fe-La Alloy Coating by Pulse Electrodeposition

作　　者：张学会[1] 刘峥[1] 张京迪[1] 周英智[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,桂林541004

出　　处：《机械工程材料》2010年第12期33-36,39,共5页Materials For Mechanical Engineering

基　　金：广西自然科学基金资助项目(0731015);广西研究生教育创新人才联合培养基地项目

摘　　要：采用脉冲电沉积制备了纳米晶镍-钨-铁-镧合金镀层,并在氩气保护下对镀层进行了热处理;用SEM和XRD分析了镀层的形貌与物相组成,通过极化曲线、循环伏安曲线和交流阻抗谱考察了不同状态镀层的电催化析氢性能。结果表明:镀层表面颗粒均匀、排列紧密、无裂纹,其组织是以镍为溶剂、钨和铁为溶质的置换型固溶体;经200℃×60min热处理后,镀层析氢性能最好,与传统铁电极相比,析氢电位正移了250mV。The nanocrystalline Ni-W-Fe-La alloy coating was prepared by pulse electrodeposition and then the coating was heat-treated under the protection of Ar.The morphology and phase composition of the coating were analyzed by means of SEM and XRD.The electrocatalytic properties for hydrogen evolution reaction（HER） of the coatings under different states were studied through polarization curves,cyclic voltammetry curves and electrochemical impedance spectroscopy.The results indicate that the grains of the coating surface distributed uniformly and closely with no cracks.The microstructure was substitutional solutes with Ni as the solvent and W and Fe as the solute.The coatings of the alloy had the best hydrogen evolution properties after heat treatment at 200℃for 60 min.In comparison with the traditional iron electrode,the potential for hydrogen evolution was positively shifted about 250 mV.

关 键 词：纳米晶合金 镀层 析氢性能 脉冲电沉积 

分 类 号：TB383[一般工业技术—材料科学与工程] TG174.2[金属学及工艺—金属表面处理]