Enhancing Hydrogen Evolution Catalysis Through Potential-Induced Structural Phase Transition in Transition-Metal Dichalcogenide Thin Sheets

Overview

Journal J Phys Chem Lett

Publisher American Chemical Society

Specialty Chemistry

Date 2024 Feb 22

PMID 38386002

Authors

I-Wen Peter Chen

Yi-Lun Tseng

Jeremiah Hao Ran Huang

Kuan-Lun Chen

Tsai Yun Liu

Jui-Chin Lee

Affiliations

Soon will be listed here.

Abstract

Enhancing electrocatalytic performance relies on effective phase control, which influences key catalytic properties, such as chemical stability and electrical conductivity. Traditional methods for manipulating the phase of transition-metal dichalcogenides (TMDs), including high-temperature synthesis, Li intercalation, and doping, involve harsh conditions and energy-intensive processes. This study introduces an innovative approach to crafting heterophase structures (2H-1T-WS) in TMDs, using WS as a model compound, encompassing both semiconducting (2H) and metallic (1T) types through a straightforward potential activation method. Insights from in situ electrochemical Raman spectroscopy, HR-TEM, and XPS measurements reveal distinctive partial phase-transition behavior. This behavior enables the partially exposed basal plane of 2H-1T-WS to demonstrate superior activity in the hydrogen evolution reaction (HER), attributed to enhanced electrical conductivity and the exposure of highly active sites. The potential-induced phase transition presents promising avenues for the development of catalysts with heterophase structures.

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