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129th General Meeting of Korean Chemical Society & Exposition Stabilization of metastable phase WS2 quantum dots via Re doping for enhanced HER performance

Submission Date :
2 / 28 / 2022 , 10 : 15 : 53
Abstract Number :
129022826188
Presenting Type:
Poster Presentation
Presenting Area :
Electrochemistry
Authors :
HoonJu Lee, Hyeon Suk Shin1,*
Energy Engineering, Ulsan National Institute of Science and Technology, Korea
1Department of Chemistry, Ulsan National Institute of Science and Technology, Korea
Assigned Code :
ELEC.P-710 Assigend Code Guideline
Presenting Time :
April 15 (FRI) 11:00~13:00
Although layered transition metal dichalcogenide (TMD) nanosheets have attracted great attention due to their unique properties, it still remains challenge to develop a facile strategy for the precise control of the lateral size. Moreover, metallic phase of TMD monolayers have been demonstrated as promising electrocatalysts for hydrogen evolution reaction (HER) induced by the high intrinsic conductivity, however, the key challenges to maximize the catalytic activity are achieving the metallic phase with high concentration and increasing the density of the active sites. In this study, we demonstrate a solution-based synthetic protocol to prepare WS2 quantum dots (QD) which possess extremely small lateral dimensions facilitating expose of edge sites, and WS2 doped with rhenium (Re). The presence of Re converts the material to stable distorted tetragonal structure (93% phase purity) that shows enhanced HER activity (with Tafel slope of 44 mV/dec and 158 mV at a current density of 10 mA/cm2) as compared to most of the WS2-based catalyst reported in the literature which including the normally inert basal planes of 2D layer of WS2. More importantly, this new alloy catalyst shows high HER catalytic activity and stability. The role of Re is to stabilize the 1T’ phase structure, while catalysis occurs primarily in local W-rich 1T’ phase configurations, where the HER catalytic activity is very close to that in Pt. The study provides a new strategy to improve the overall HER performance of WS2-based materials via chemical doping.