Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 7, Issue 4, Pages 961-967Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cy02382g
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Funding
- National Natural Science Foundation of China [51572253, 21271165]
- Scientific Research Grant of Hefei Science Center of CAS [2015SRG-HSC048]
- NSFC [51561135011]
- Netherlands Organization for Scientific Research [51561135011]
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Final metal sulfides Zn0.5Cd0.5S (ZnCdS-CH) are synthesized through a coprecipitation process followed by hydrothermal treatment. The morphological, structural and optical properties have been investigated extensively via diverse analytical techniques. The ZnCdS-CH solid solution without noble metal loading is employed in photocatalytic H-2 evolution under visible light irradiation (lambda >= 420 nm) and achieves a superior activity rate of 0.971 mmol h(-1), which exceeds those of coprecipitated Zn0.5Cd0.5S (ZnCdS-C) samples by more than 13 times. Moreover, in the recycle test, the ZnCdS-CH photocatalyst shows a stable photocatalytic activity for H-2 evolution under long-term visible-light irradiation. Characterization analyses demonstrate that the excellent photocatalytic H-2-evolution performance of the ZnCdS-CH sample arises predominantly from the two-step processing procedure of coprecipitation followed by hydrothermal treatment at 200 degrees C, which makes it possess a hexagonal (wurtzite) structure, good dispersity, enhanced crystallinity, an appropriate band gap, a more negative conduction band, as well as a large number of surface defect states. This finding is of great significance for designing a facile, reproducible and inexpensive method to realise the potential of ZnxCd1-xS ternary metal sulfides in the field of H-2 evolution by water splitting.
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