RuO2修饰纳米多孔Ni-Mo复合电极及其电催化析氢性能  

Composite Electrodes of Nano-Porous Ni-Mo Modified by RuO and Electrocatalytic Property for Hydrogen Evolution

作　　者：周琦[1,2] 黎新宝 李志洋[2] ZHOU Qi;LI Xin-Bao;LI Zhi-Yang(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;College of Materials Science and Engineering,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,兰州730050 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《无机化学学报》2020年第9期1649-1658,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51661018)资助项目。

摘　　要：采用脱合金化结合胶体聚沉的方法制备了纳米多孔Ni/RuO2、Ni-Mo/RuO2复合电极材料。通过X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)对电极材料的物相、元素组态、形貌结构、孔径大小和结晶度进行表征,并通过线性扫描伏安、交流阻抗以及循环伏安等方法测试多孔电极的电催化析氢性能。分析结果显示:RuO2由于聚沉作用包覆在Ni基合金的骨架表面。Mo的加入使Ni-Mo合金非晶化的同时,促使其骨架细化,形成双连续的纳米多孔结构。Mo与RuO2的加入以及Mo含量的增加均提高了电催化析氢性能。纳米多孔Ni2.5Mo2.5/RuO2复合电极在50 mA·cm^-2的电流密度下析氢过电位为182 mV。The nano-porous Ni/RuO2 and Ni-Mo/RuO2 composite electrode material were prepared by de-alloying combined with deposition precipitation.The phase,element,morphology and structure,pore size and crystallinity of the electrode material were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scan-ning electron microscope(SEM),transmission electron microscope(TEM).The electrocatalytic hydrogen evolution of porous electrode was tested by linear sweep voltammetry,AC impedance and cyclic voltammetry.The analysis re-sults showed that RuO2 was cladded on the surface of the Ni-based alloy skeleton due to polycondensation.The addi-tion of Mo enhanced the amorphization of the Ni-Mo alloy and promoted the refinement of the pore size of the porous skeleton to form a bicontinuous and porous nanostructure.The addition of Mo and RuO2 and the increase of Mo con-tent all improved the electrocatalytic hydrogen evolution performance.The nanoporous Ni2.5Mo2.5/RuO2 composite electrode had a better electrocatalytic hydrogen evolution activity:at a current density of 50 mA·cm^-2,its hydrogen overpotential was 182 mV.

关 键 词：纳米结构 脱合金化 氧化钌 电化学 水分解 

分 类 号：O646[理学—物理化学] O614.812[理学—化学]