Activation of the Carbon Nitride Surface by Silica in a CO-Evolving Hybrid Photocatalyst

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• 作者：Keisuke Wada ; Dr. Miharu Eguchi ; Prof. Dr. Osamu Ishitani and Prof. Dr. Kazuhiko Maeda
• 刊名：ChemSusChem
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：10
• 期：1
• 页码：287-295
• 全文大小：1830K
• ISSN：1864-564X

文摘

Photocatalytic reduction of CO₂ to CO proceeded by visible light (λ>400 nm) using mesoporous graphitic carbon nitride (C₃N₄) coupled with a Ru^II–Re^I binuclear complex (RuRe) containing a photosensitizer and catalytic units. The selectivity to CO exceeded 90 % during the initial stage. Photocatalytic reactions (including isotope tracer experiments) and electrochemical measurements revealed that the reaction proceeded according to a two-step photoexcitation of C₃N₄ and the Ru^II photosensitizer unit, that is, it followed the Z-Scheme mechanism. Modification of C₃N₄ with highly dispersed silica was found to improve the ability of C₃N₄ to accommodate RuRe, which enhanced the photocatalytic activity for CO production.