报告题目Title：Activating WS2 Basal Plane for Highly Efficient Hydrogen Evolution 二硫化钨表面的高效率析氢反应
报 告 人Speaker：Dr. Tao Hu, Department of Chemistry and Biochemistry, California State University, Northridge
报告时间Time：2017年2月27日 (周一) 10:00
报告地点Venue：校本部E106（永利量子与分子结构国际中心SHU ICQMS）
摘要：Electrocatalytic water splitting is a plausible alternative for hydrogen production with high impact in energy generation. The transitional-metal dichalcogenides (TMDCs), such as molybdenum disulfide (MoS2) tungsten disulfide (WS2), have been greatly expected to be efficient and noble-metal-free catalysts for hydrogen evolution reaction (HER). However, the HER activity can’t take place on the inert basal plane, which has a very large surface area is an intrinsic advantage for TMDs. By introducing sulfur (S) vacancies on the surface of WS2, it is found that the inert basal plane of WS2 turns out to be active for HER. The HER activity is extremely enhanced due to the binding between hydrogen and exposed W atoms. The hydrogen adsorption free energy indicates that the basal plane exhibits high performance in HER with a wide range of S vacancies concentration. Furthermore, the straining of surface with S vacancies has a trend to decrease the hydrogen adsorption free energy. Thus, it’s more flexible to achieve the highest efficiency of HER by joint manipulation of S-vacancies concentration and surface strain.
