水溶液中电沉积制备LaMg_2Ni_9储氢合金  

Electrodeposition of LaMg_2Ni_9 Hydrogen Storage Alloys in Aqueous Bath

作　　者：于锦[1] 周静[1] 陈庆阳[2] 

机构地区：[1]沈阳工业大学,辽宁沈阳110870 [2]沈阳师范大学,辽宁沈阳110034

出　　处：《稀有金属材料与工程》2016年第10期2647-2652,共6页Rare Metal Materials and Engineering

基　　金：辽宁省教育厅科学研究项目计划(L2010396)

摘　　要：利用水溶液电沉积法制备La Mg_2Ni_9储氢合金膜,通过测定合金膜的循环伏安曲线(CV)、交流阻抗(EIS)、Tafel极化曲线等研究其电化学性能,采用扫描电镜(SEM)、X射线衍射(XRD)、能谱(EDS)对合金膜表面形貌、结构及组成进行研究。结果表明:电沉积电流密度为40 A/dm^2时,La Mg_2Ni_9合金膜的表面粗糙并伴有裂纹,析氢电流密度为5.37A/dm^2,表观活化自由能△G~≠最低为47.26 k J/mol,证明合金膜良好的析氢性能;吸附值Q达到最大值为0.091μF·cm^(-2),表明合金膜具有较高的储氢性能。The film of LaMg2Ni9 Hydrogen Storage alloy is prepared in aqueous solution. The electrochemical performance were studied by cyclic voltammetry（CV）, electrochemical impedance spectroscopy（EIS） and Tafel polarization curve. Sanning electronic microscope（SEM）, X-ray diffractometer（XRD） and energy distribution spectrum（EDS）were used to research the phase structure, component and composition. The results showed that the LaMg2Ni9 film has a crudity surface with a cracke. The alloy film obtained at 40A/dm^2, the△G^≠reaches to 47.26kJ/mol, the Hydrogen evolution current density jo is 5.37 A/cm^2, indicating it has higher hydrogen evolution activity; the electrode adsorption degree Q is 0.091F/cm^2, indicating the film has better hydrogen storage function.

关 键 词：LA Mg2Ni9 析氢 储氢 电沉积 

分 类 号：TG139.7[一般工业技术—材料科学与工程]