Abstract
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. CdS/graphene nanocomposite with 4.6 wt% graphene sheets displayed the optimum photocatalytic efficiency for methylene blue degradation. They showed excellent anti-photocorrosion behavior and photostablity under visible-light irradiation.
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