Synthesis and Efficient Visible Light Photocatalytic Hydrogen Evolution of Polymeric g-C3N4 Coupled with CdS Quantum Dots

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• 作者：Lei Ge ; Fan Zuo ; Jikai Liu ; Quan Ma ; Chen Wang ; Dezheng Sun ; Ludwig Bartels ; Pingyun Feng
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：June 28, 2012
• 年：2012
• 卷：116
• 期：25
• 页码：13708-13714
• 全文大小：520K
• 年卷期：v.116,no.25(June 28, 2012)
• ISSN：1932-7455

文摘

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鈥搗isible 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 H₂ production activity of the materials. The optimal CdS QD content is determined to be 30 wt %, and the corresponding H₂ evolution rate was 17.27 渭mol路h^鈥? under visible light irradiation, 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.