Conversion of Layered WS<sub>2</sub> Crystals into Mixed-Domain Electrochemical Catalysts by Plasma-Assisted Surface Reconstructionopen access
- Authors
- Park, Jiheon; Cho, Iaan; Jeon, Hotae; Lee, Youjin; Zhang, Jian; Lee, Dongwook; Cho, Min Kyung; Preston, Daniel J.; Shong, Bonggeun; Kim, In Soo; Lee, Won-Kyu
- Issue Date
- 3-Apr-2024
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- catalytic materials; hydrogen evolution reaction; plasma treatment; transition metal chalcogenides; water electrolysis
- Citation
- ADVANCED MATERIALS
- Journal Title
- ADVANCED MATERIALS
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/33038
- DOI
- 10.1002/adma.202314031
- ISSN
- 0935-9648
1521-4095
- Abstract
- Electrocatalytic water splitting is crucial to generate clean hydrogen fuel, but implementation at an industrial scale remains limited due to dependence on expensive platinum (Pt)-based electrocatalysts. Here, an all-dry process to transform electrochemically inert bulk WS2 into a multidomain electrochemical catalyst that enables scalable and cost-effective implementation of the hydrogen evolution reaction (HER) in water electrolysis is reported. Direct dry transfer of WS2 flakes to a gold thin film deposited on a silicon substrate provides a general platform to produce the working electrodes for HER with tunable charge transfer resistance. By treating the mechanically exfoliated WS2 with sequential Ar-O-2 plasma, mixed domains of WS2, WO3, and tungsten oxysulfide form on the surfaces of the flakes, which gives rise to a superior HER with much greater long-term stability and steady-state activity compared to Pt. Using density functional theory, ultraefficient atomic sites formed on the constituent nanodomains are identified, and the quantification of atomic-scale reactivities and resulting HER activities fully support the experimental observations.
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- Appears in
Collections - College of Engineering > Materials Science and Engineering Major > 1. Journal Articles
- College of Engineering > Chemical Engineering Major > 1. Journal Articles
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