Operando Raman Spectroscopy of Amorphous Molybdenum Sulfide (MoSx) during the Electrochemical Hydrogen Evolution Reaction: Identification of Sulfur Atoms as Catalytically Active Sites for H+ Reduction
作者： Yilin Deng , Louisa Rui Lin Ting , Perlin Hui Lin Neo , Yin-Jia Zhang , Andrew A Peterson
关键词: Inorganic chemistry 、 X-ray photoelectron spectroscopy 、 Cyclic voltammetry 、 Sulfur 、 Chemistry 、 Amorphous solid 、 Raman spectroscopy 、 Catalysis 、 Electrocatalyst 、 Electrochemistry
摘要: Amorphous molybdenum sulfide (MoSx) is currently being developed as an economically viable and efficient catalyst for the electrochemical hydrogen evolution reaction (HER). An important yet unsolved problem in this ongoing effort identification of its catalytically active sites proton reduction. In work, cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), Raman were used to investigate structural MoSx films during HER 1 M HClO4 electrolyte. Transformation anodically deposited (x ≈ 3) a structure with MoS2 composition cathodic sweep CV was demonstrated using XPS operando spectroscopy. Interestingly, peak at 2530 cm–1 recorded potentials relevant H2 evolution, which we ascribed S–H stretching vibration MoSx–H moieties. This assignment corroborated by H/D isotope exchange experiments. Mo–H (or Mo–D) vibrations not observed, which...
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