Journal
CHINESE JOURNAL OF CATALYSIS
Volume 34, Issue 10, Pages 1876-1882Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(12)60677-9
Keywords
CdS nanocrystal; Graphene nanocomposite; Anti-photocorrosion; Photocatalysis; Methylene blue degradation
Funding
- National Natural Science Foundation of China [21175061, 21007021]
- Key Laboratory of Modern Agriculture Equipment and Technology [NZ201109]
- China Postdoctoral Science Foundation [2012M520998]
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A series of CdS nanocrystals/graphene (CdS/GR) nanocomposites with various graphene contents were prepared. Their photocatalytic efficiencies and anti-photocorrosion behavior were studied using methylene blue degradation under visible-light irradiation. The results showed that the introduction of graphene improved the migration efficiency of photogenerated carriers and inhibited charge carrier recombination. The photocatalytic efficiencies of the as-prepared CdS/GR nanocomposites were influenced by the graphene content, achieving a maximum at a graphene content of 4.6 wt% (denoted by CdS/GR-4.6%). The anti-photocorrosion behavior of the CdS/GR-4.6% nanocomposite was further investigated using a photoelectrochemical method and X-ray diffraction analysis. The photocorrosion of CdS nanocrystals was effectively suppressed after the introduction of graphene sheets. Compared with bare CdS nanocrystals, the photocurrent of the CdS/GR-4.6% nanocomposites increased 2.3-fold. (C) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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