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.
作者
周琦
黎新宝
李志洋
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)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
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。
关键词
纳米结构
脱合金化
氧化钌
电化学
水分解
nanostructures
dealloying
RuO2
electrochemistry
water splitting
