La掺杂对NiCo/Cu的显微结构及电催化性能的影响  

Effect of La Doping on Microstructure and Electrocatalytic Performance of NiCo/Cu Electrodes

作　　者：王贵 唐谊平 曹华珍 郑国渠 侯广亚 Wang Gui;Tang Yiping;Cao Huazhen;Zheng Guoqu;Hou Guangya(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学材料科学与工程学院,浙江杭州310014

出　　处：《稀有金属材料与工程》2020年第12期4230-4235,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51101140);浙江省自然科学基金(LY16E010004)。

摘　　要：通过简单的一步水热法在铜片上负载La掺杂NiCo合金制备催化电极。借助XRD、FESEM、循环伏安测试研究了溶液中Ni^2+/Co^2+摩尔比、La掺杂量对试样物相、显微结构、负载量及甲醇电催化氧化性能的影响。研究表明:Co元素的引入使生长的颗粒粒径增大,负载量显著增加。随着溶液中Co^2+量的增加,峰电流密度先增后减。Ni^2+/Co^2+摩尔比在8:2时性能良好,与Ni/Cu电极相比,峰电流密度提升了约28.4%。La的掺杂使NiCo颗粒呈现多边化,进而影响电化学性能,随着La的掺杂量的增加,峰电流密度先升后降,掺杂0.1 mmol/L La^3+的试样获得良好的性能,峰电流密度达到了50.36mA/cm^2,2000次循环后仍保留近初始的100%,具有优异的稳定性,有望用于直接甲醇燃料电池(DMFC)阳极材料。The catalytic electrode was prepared via a simple one-step hydrothermal method to load La-doped Ni/Co on a copper sheet.XRD,FESEM,cyclic voltammetry and other tests were used to study the influence of the molar ratio of Ni/Co salt and the amount of doped La on the microstructure of the sample and the electrocatalytic oxidation performance to methanol.The results show that the introduction of Co increases the particle size,and the load also increases significantly.The peak current density increases first and then decreases with the increases of the Co^2+content.When the molar ratio of Ni^2+/Co^2+in the solution is 8:2,the sample gets good performance and the peak current density increases by 28.4%compared with that of Ni/Cu electrode.Besides,the doping of La affects the morphology of the particles and thus influences the electrochemical performance.When the doping amount of La increases,the peak current density firstly increases and then decreases.The sample doped with 0.1 mmol/L La obtains superior performance and its peak current density reaches 50.36 mA/cm^2.After 2000 cycles test,it retains nearly 100%of the initial current density.It has good stability and can be used in direct methanol fuel cell(DMFC).

关 键 词：甲醇电催化氧化 NiCo合金 水热合成 LA掺杂 

分 类 号：TM911.4[电气工程—电力电子与电力传动]