Photocatalytic H2 Evolution on CdS Loaded with WS2 as Cocatalyst under Visible Light Irradiation

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• 作者：Xu Zong ; Jingfeng Han ; Guijun Ma ; Hongjian Yan ; Guopeng Wu ; Can Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：June 23, 2011
• 年：2011
• 卷：115
• 期：24
• 页码：12202-12208
• 全文大小：913K
• 年卷期：v.115,no.24(June 23, 2011)
• ISSN：1932-7455

文摘

WS₂/CdS photocatalysts with different amounts of WS₂ cocatalyst are prepared by loading WS₂ on CdS with an impregnation鈥搒ulfidation approach. The transformation process of the tungsten species loaded on CdS together with the junctions formed between WS₂ and CdS are clearly demonstrated with X-ray photoelectron spectroscopy and transmission electron microscopy. Photocatalytic H₂ production on WS₂/CdS catalysts under visible light (位 > 420 nm) shows that WS₂ cocatalyst plays a crucial role in H₂ production. Under optimum conditions, the rate of H₂ evolution can be increased by up to 28 times when CdS was loaded with only 1.0 wt % WS₂, and WS₂ demonstrates a catalytic performance comparable or even superior to those of noble metals. Photocatalytic reaction results and electrochemical measurements indicate that the significantly enhanced H₂ evolution of WS₂/CdS catalyst mainly owns to the junctions formed between WS₂ and CdS and the excellent performance of WS₂ as a cocatalyst in catalyzing H₂ evolution.