Ru/TiO_(2)-P催化剂的制备及其电催化析氢性能

Preparation and Hydrogen Evolution Performance of Ru/TiO_(2)-P

采用一步低温水热法和后续磷化处理制备了Ru/TiO_(2)-P催化剂。利用X-射线衍射(XRD)、透射电子显微镜(TEM)和X-射线光电子能谱(XPS)等手段对催化剂进行了表征。研究了该催化剂在0.5 mol·L^(-1)H_(2)SO_(4)溶液中的电催化析氢性能,达到10 mA·cm^(-2)的电流密度时过电势仅为55 mV且经过2 000圈的循环伏安测试后催化活性没有衰减,表明其良好的电催化析氢活性和稳定性。这种优异的性能主要归因于两个方面:(1)磷化过程调控晶粒尺寸,形成更多的粒子间晶界,暴露更多的活性位点;(2)增磷反应后磷以PO_(4)^(3-)形式存在,其氧原子可作为H^(*)吸附位点,增强了催化剂对H^(*)中间体的吸附能力,从而提升催化剂活性。

Ru/TiO_(2)-P as a highly active HER electrocatalyst was synthesized by one-step hydrothermal method under low temperature combining with subsequently phosphorization treatment. The catalyst was characterized by methods of X-ray diffraction(XRD), transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). The electrocatalytic hydrogen evolution reaction(HER) performance of Ru/TiO_(2)-P was investigated in 0.5 mol·L^(-1)H_(2)SO_(4)electrolyte, which exhibits high activity with a low overpotential of 55 mV at a current density of 10 mA·cm^(-2)as well as excellent stability. Two possible reasons are contributed to the high performance of Ru/TiO_(2)-P catalyst: First, the size of the nanoparticles was tuned by the phosphorization, coupled with the formation of more inter-particle grain boundaries, which can expose more active sites;Second, there are PO_(4)^(3-)existed in the catalyst after phosphorization and the oxygen in the PO_(4)^(3-)groups can be served as the active sites for Hadsorption, which can enhance the capability to the adsorption of H, and thus, improving the catalytic activity.