Protonated Graphitic Carbon Nitride with Surface Attached Molecule as Hole Relay for Efficient Photocatalytic O2 Evolution

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• 作者：Chen Ye ; Xu-Zhe Wang ; Jia-Xin Li ; Zhi-Jun Li ; Xu-Bing Li ; Li-Ping Zhang ; Bin Chen ; Chen-Ho Tung ; Li-Zhu Wu
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：December 2, 2016
• 年：2016
• 卷：6
• 期：12
• 页码：8336-8341
• 全文大小：471K
• ISSN：2155-5435

文摘

Carbon nitride has been considered as one of the most promising materials to catalyze O₂ evolution from water; however, its intrinsic drawbacks of surficial inertness and poor charge separation efficiency are serious. In contrast to the ordinary modification method of cocatalyst loading, we describe here that a simple modification method of molecule loading can greatly improve the activity of carbon nitride for O₂ evolution. A mechanistic investigation by time-resolved transient absorption spectroscopy reveals that the BODIPY molecule can extract photogenerated holes in carbon nitride to promote the oxidation of water. It is the first case of a dye molecule acting as a hole relay to promote photocatalytic water oxidation. These results provide a new approach to the modification for the better catalytic performance of carbon nitride on O₂ evolution.