RuO2修饰纳米多孔Ni-Mo复合电极及其电催化析氢性能

采用脱合金化结合胶体聚沉的方法制备了纳米多孔Ni/RuO_2、Ni-Mo/RuO_2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:RuO_2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RuO_2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Ni_(2.5)Mo_(2.5)/RuO_2复合电极在50 mA·cm~(-2)的电流密度下析氢过电位为182 mV。

Composite Electrodes of Nano-Porous Ni-Mo Modified by RuO2 and Electrocatalytic Property for Hydrogen Evolution

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), scanning 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 results showed that RuO₂ was cladded on the surface of the Ni-based alloy skeleton due to polycondensation. The addition 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 content all improved the electrocatalytic hydrogen evolution performance. The nanoporous Ni_2.5Mo_2.5/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.