期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 25, 页码 13708-13714出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp3041692
关键词
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资金
- NSF [DMR-0907175, CHE-1213795]
- National Science Foundation of China [21003157]
- Beijing Nova Program [2008B76]
- Science Foundation of China University of Petroleum, Beijing [KYJJ2012-06-20]
- U.S. Department of Energy [DE-FG02-07ER15842]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1213795] Funding Source: National Science Foundation
Novel CdS quantum dot (QD)-coupled graphitic carbon nitride (g-C3N4) photocatalysts were synthesized via a chemical impregnation method and characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The effect of CdS content on the rate of visible light photocatalytic hydrogen evolution was investigated for different CdS loadings using platinum as a cocatalyst in methanol aqueous solutions. The synergistic effect of g-C3N4 and CdS QDs leads to efficient separation of the photogenerated charge carriers and, consequently, enhances the visible light photocatalytic H-2 production activity of the materials. The optimal CdS QD content is determined to be 30 wt %, and the corresponding H-2 evolution rate was 17.27 mu mol.h(-1) under visible light irradiation, similar to 9 times that of pure g-C3N4. A possible photocatalytic mechanism of the CdS/g-C3N4 composite is proposed and corroborated by photoluminescence spectroscopy and photoelectrochemical curves.
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