Conversion of Layered WS2 Crystals into Mixed‐Domain Electrochemical Catalysts by Plasma‐Assisted Surface Reconstruction
Source abstract
Abstract
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‐O2 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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Photocatalysis Techniques · Fuel Cells and Related Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Engineering Hongik University Seoul 04066 Republic of Korea
Department of Chemical Engineering Hongik University Seoul 04066 Republic of Korea
International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 China
Advanced Analysis and Data Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea
Department of Mechanical Engineering Rice University Houston TX 77005 USA
Nanophotonics Research Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea
KIST‐SKKU Carbon‐Neutral Research Center Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
School of Advanced Materials Science and Engineering Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
Funding
National Research Foundation of Korea · National Natural Science Foundation of China
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