Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 287, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119992
Keywords
Bimetal sulfo-oxide; Oxygen vacancies; Hydrogen evolution reaction; Visible light
Funding
- National Natural Science Foundation of China [31000269]
- Strait Postdoctoral Program [1323H0005]
- China Postdoctoral Program [2018M632562]
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The study found that (Mo,Ni)(S,O)(3-x) with a suitable amount of oxygen vacancy defects could evolve 587.5 μmol/h H-2 under visible-light irradiation. This research successfully converted an oxidation photocatalyst into a reduction one, promoting effective separation, interface transfer, and reactions of photo-carriers while reducing charge build-up to prevent photo-corrosion during photocatalytic water decomposition.
Photocatalytic H2O splitting by sulfide-based materials is a great challenge, because of the poor resilience of such materials against hole oxidation. Although sulfide ion of catalyst negatively shifts the valence band-edge relative to its oxide ion, the instability of sulfide ions during H2O oxidation is a critical obstacle to simultaneous evolution of H-2 and O-2. Here, active, stable, and spherical nanoflower-like bimetal (Mo,Ni)(S,O)(3-x) sulfo-oxide catalysts with a band gap of similar to 2.1 eV and different concentrations of oxygen vacancy defects were synthesized for H2O splitting. (Mo,Ni)(S,O)(3-x) of 25 mg with a suitable amount of oxygen vacancy defects could evolve 587.5 mu mol/h H-2 under visible-light irradiation. This work demonstrated an example of converting an oxidation photocatalyst into a reduction one. Microstructure analysis showed that surface oxygen vacancy defects and the multiple-valence charges in Ni and Mo not only promoted effective separation, interface transfer, and reactions of photo-carriers but also reduced the charge build-up to avoid photo-corrosion during photocatalytic water decomposition.
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