高能球磨活化二硫化钨的制备及其电催化析氢性能研究

Preparation and Electrocatalytic Hydrogen Evolution of Tungsten Disulfide Activated by High-Energy Ball Milling

采用高能球磨对商业二硫化钨进行活化处理,通过控制球磨工艺,制备出不同活化程度的WS_(2)析氢电催化剂。通过XRD、Raman、SEM、TEM、XPS等系列表征和电化学分析,系统研究其成分结构与电催化析氢性能。结果表明:在酸性电解液中,350 r/min球磨活化处理12 h后的WS_(2)样品表现出最佳析氢性能,其在电流密度为10 mA/cm^(2)时的过电位η_(10)为245 mV,塔菲尔斜率为141 mV/dec,远优于未球磨样品,其性能提升主要归因于球磨过程中的高能撞击产生强力剪切和剥离作用,使晶粒破碎细化,比表面积增大的同时产生大量的孔洞缺陷和空位,暴露出更多活性位点和边缘缺陷。

Commercial tungsten disulfide was activated by high-energy ball milling,and WS_(2) electrocatalysts with different activation degrees were prepared by controlling the ball milling process.The compositions,microstructures and electrocatalytic hydrogen evolution performance were systematically studied by XRD,Raman,SEM,TEM,XPS,and electrochemical analysis.The results show that in the acidic electrolyte,the BM-WS_(2)-350-12 with ball milling and activation treatment shows the best hydrogen evolution performance with a Tafel slope of 141 mV/dec,and its overpotential of η_(10) to achieve the current density of 10 mA/cm^(2) is 245 mV,much better than the original sample.After ball milling,the hydrogen evolution performance of commercial tungsten disulfide is significantly improved,which should be attributed to the strong shearing and peeling action caused by the high-energy impact during ball milling,which makes the grains broken and refined,increases the specific surface area,produces a large number of hole defects and vacancies,exposes more active sites and edge defects.