Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 36, Pages 10927-10934Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12301d
Keywords
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Funding
- 973 program [2013CB632402]
- 863 Program [2012AA062701]
- NSFC [51072154, 21177100, 51272199]
- Fundamental Research Funds for the Central Universities [WUT: 2013-VII-030]
- Self-determined and Innovative Research Funds of SKLWUT [2013-ZD-1]
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Single crystalline hexagonal CdS nanowires were prepared by a solvothermal method using ethylenediamine as a solvent. Pt/CdS nanocomposites were produced by different reduction methods and characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, UV-visible spectroscopy, nitrogen absorption, pulse H-2 chemisorption and X-ray photoelectron spectroscopy. The photocatalytic performance of the as-synthesized Pt/CdS nanocomposites was evaluated towards H-2 generation from a lactic acid aqueous solution under visible light (lambda >= 420 nm). The sample prepared by the NaBH4 reduction method showed a higher photocatalytic H-2-production activity than the sample prepared by the photo-reduction deposition method. A remarkable H-2-production rate of 1.49 mmol h(-1) with a quantum efficiency (QE) of 61.7% was first achieved on the former with a small amount of Pt (0.3 wt%) as a co-catalyst. The photocatalytic activity difference of the samples is because reduction methods influence the size and dispersion of Pt nanoparticles (NPs), which further influence the photocatalytic H-2-production activity. The sample from the NaBH4 reduction method contains smaller Pt NPs (ca. 1-2 nm) and has higher Pt dispersion (72%), thus resulting in the higher H-2-production activity. Further experiments showed that the one-dimensional nanostructure markedly enhanced the photocatalytic H-2-production activity of CdS. After ball milling of the nanowires, which leads to destruction of their structure, the photocatalytic H-2-production activity of CdS decreases by more than 30%. The underlying mechanism for the observed photocatalytic H-2-production performance of Pt/CdS nanocomposites was discussed.
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