期刊
CHEMICAL ENGINEERING JOURNAL
卷 464, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.142704
关键词
Sulfur vacancies; Interfacial chemical bond; Hydrogen evolution; S-scheme heterojunction
In this study, hierarchical flower-like ReS2-hybridized laminar hexagonal MoSe2 with sulfur vacancies (Sv) was constructed for water splitting. The interfacial chemical interaction of Mo-S bond and built-in electric field induced the S-scheme charge transfer mode, leading to enhanced hydrogen production. The optimized Sv-ReS2/2H-MoSe2 heterojunction achieved a maximum hydrogen production rate of 78.2 μmol/h with an apparent quantum yield of 9.3% at 420 nm, showcasing its potential for sustainable solar-to-fuel conversion.
Developing innovative S-scheme photocatalytic systems with highly active catalysts are of huge interest in converting solar energy into hydrogen in a sustainable manner. Herein, sulfur vacancies (Sv)-rich hierarchical flower-like ReS2-hybridized laminar hexagonal (2H) MoSe2 (2H-MoSe2) were constructed for water splitting. Systematic studies show that interfacial chemical interaction of Mo-S bond and built-in electric field induce the S-scheme charge transfer mode, as verified by the generated superoxide radicals, band structures, and density functional theory calculation. With the intense cooperative effects of Mo-S bonds, S-vacancies, and internal electric field, the optimized Sv-ReS2/2H-MoSe2 heterojunction concurrently attains populated exposed active sites, superior electron-hole separation efficiency, and intensive affinity to reactant water molecules, achieving a maximum hydrogen production rate of 78.2 & mu;mol/h with an apparent quantum yield of 9.3% at 420 nm, which is approximately 5.9-fold greater than pristine ReS2. This work paves a new avenue to engineering S-scheme catalysts for sustainable solar-to-fuel conversion.
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