Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 933, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167620
Keywords
H2 evolution; Built-in electric field; S-scheme heterojunction; Unsaturated Ag active site
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In this study, an Ag-modified g-C3N4/CdS photocatalyst with a distinctive charge transfer channel was prepared, leading to an enhanced H2 production performance.
Ag modified g-C3N4/CdS (Ag@g-C3N4/CdS) S-scheme heterojunction with a distinctive charge transfer channel was prepared as a photocatalyst for photoreduction of H2O. The effect of nitrogen vacancies and photo-excited charge carriers in the water splitting on the Ag@g-C3N4/CdS was discussed. It was found that the charge carriers transport channel in Ag@g-C3N4/CdS S-scheme heterojunction was instrumental in the enhancement of H2 production. The electrons in Ag nanospheres and in the conduction band (CB) of CdS can recombine with the holes in the valence band (VB) of g-C3N4, which prolonged the lifetime of electrons in the CB of g-C3N4. Meanwhile, a unique charge transfer channel was produced in the Ag@g-C3N4/CdS. Compared with g-C3N4, Ag@g-C3N4/CdS photocatalyst demonstrated an enhanced performance which was assigned to the increased charge carrier lifetime. The supreme Ag@g-C3N4/CdS showed photocatalytic H2 production activity up to 204.19 mu mol for 4 h under illuminate (lambda >= 420 nm), which was 11.74 times than that of g-C3N4.(c) 2022 Elsevier B.V. All rights reserved.
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