不同Co含量对纳米多孔Ni-Co结构及析氢催化性能的影响  

Effect of Different Co contents on Structure of Nanoporous Ni-Co and Catalytic Performance of Hydrogen Evolution

作　　者：冯基伟 周琦[1] FENG Ji-Wei;ZHOU Qi(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室

出　　处：《无机化学学报》2019年第10期1746-1754,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51661018)资助项目

摘　　要：通过真空熔炼和快速凝固的方法制备了不同Co含量的Ni-Co-Al合金,经脱合金化后得到纳米多孔Ni-Co。采用XRD、SEM、TEM、N2吸附-脱附研究了所得纳米多孔Ni-Co结构特征,以线性扫描伏安法(LSV)、交流阻抗(IMP)等手段对纳米多孔Ni-Co/GCE电极析氢性能进行了测试。结果表明:纳米多孔Ni-Co合金骨架表面存在尺寸更为细小的5~10nm的小孔,Co含量(质量分数)在40%~60%时,析氢催化性能较好。Ni-Co-Al alloys with different Co contents were prepared by vacuum smelting and rapid solidification.XRD,SEM,TEM and N2 adsorption-desorption were used on the structure characterization of nanoporous Ni-Co,and the hydrogen evolution performance of nanoporous Ni-Co/GCE electrode was tested by linear sweep voltammetry(LSV)and ac impedance(IMP).The results showed that there were smaller pores(5~10 nm)on the surface of the nanoporous Ni-Co alloy skeleton,and the catalytic performance of hydrogen evolution was better when the Co content was 40%~60%(w/w).Among them,the pores of Ni2.5Co2.5 and Ni3Co2 are almost uniform,and they have smaller mesoporous pores than others,which is beneficial to the infiltration of electrolyte and increase the surface area of the electrode.Therefore,Ni2.5Co2.5/GCE and Ni3Co2/GCE have high hydrogen evolution performance.When the current density was-0.005 A·cm^-2,the hydrogen evolution potential of the two electrodes were almost the same as 380 mV.

关 键 词：脱合金化 纳米多孔Ni-Co合金 析氢性能 

分 类 号：O614.812[理学—无机化学] O614.813[理学—化学]