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• W2796106368 abstract "Molybdenum disulfide (MoS2) is a semiconducting transition metal dichalcogenide that is known to be a catalyst for both the hydrogen evolution reaction (HER) as well as for hydro-desulfurization (HDS) of sulfur-rich hydrocarbon fuels. Specifically, the edges of MoS2 nanostructures are known to be far more catalytically active as compared to unmodified basal planes. However, in the absence of the precise details of the geometric and electronic structure of the active catalytic sites, a rational means of modulating edge reactivity remain to be developed. Here we demonstrate using first-principles calculations, X-ray absorption spectroscopy, as well as scanning transmission X-ray microscopy (STXM) imaging that edge corrugations yield distinctive spectroscopic signatures corresponding to increased localization of hybrid Mo 4d states. Independent spectroscopic signatures of such edge states are identified at both the S L2,3 and S K-edges with distinctive spatial localization of such states observed in S L2,3-edge STXM imaging. The presence of such low-energy hybrid states at the edge of the conduction band is seen to correlate with substantially enhanced electrocatalytic activity in terms of a lower Tafel slope and higher exchange current density. These results elucidate the nature of the edge electronic structure and provide a clear framework for its rational manipulation to enhance catalytic activity." @default.
• W2796106368 created "2018-04-13" @default.
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• W2796106368 date "2018-04-03" @default.
• W2796106368 modified "2023-10-10" @default.
• W2796106368 title "Mapping Catalytically Relevant Edge Electronic States of MoS₂" @default.
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• W2796106368 doi "https://doi.org/10.1021/acscentsci.8b00042" @default.
• W2796106368 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5920619" @default.
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