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
| Autor: | Perlin Hui Lin Neo, Yilin Deng, Andrew A. Peterson, Yin-Jia Zhang, Boon Siang Yeo, Louisa Rui Lin Ting |
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| Rok vydání: | 2016 |
| Předmět: |
Inorganic chemistry
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Sulfur Catalysis 0104 chemical sciences Amorphous solid symbols.namesake chemistry X-ray photoelectron spectroscopy symbols Cyclic voltammetry 0210 nano-technology Raman spectroscopy |
| Zdroj: | ACS Catalysis. 6:7790-7798 |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.6b01848 |
| Popis: | 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 is the identification of its catalytically active sites for proton reduction. In this work, cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were used to investigate the catalytically active sites and structural evolution of MoSx films during HER in 1 M HClO4 electrolyte. Transformation of anodically deposited MoSx (x ≈ 3) to a structure with MoS2 composition during the cathodic sweep of a CV was demonstrated using XPS and operando Raman spectroscopy. Interestingly, a Raman peak at 2530 cm–1 was recorded at potentials relevant to H2 evolution, which we ascribed to the S–H stretching vibration of MoSx–H moieties. This assignment was corroborated by H/D isotope exchange experiments. Mo–H (or Mo–D) stretching vibrations were not observed, which... |
| Databáze: | OpenAIRE |
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