Freestanding Graphitic Carbon Nitride Photonic Crystals for Enhanced Photocatalysis

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• 作者：Lu Sun ; Meijia Yang ; Jianfeng Huang ; Dingshan Yu ; Wei Hong and Xudong Chen
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：July 19, 2016
• 年：2016
• 卷：26
• 期：27
• 页码：4943-4950
• 全文大小：1923K
• ISSN：1616-3028

文摘

Graphitic carbon nitride (g-C₃N₄) has attracted tremendous attention in photocatalysis due to its extraordinary features, such as good thermal and chemical stability, metal-free composition, and easy preparation. However, the photocatalytic performance of g-C₃N₄ is still restricted by the limited surface area, inefficient visible light absorption, and high recombination rate of photoinduced charge carriers. Herein, a facile synthesis to produce freestanding g-C₃N₄ photonic crystals (PCs) by crack-free, highly ordered colloid crystals templating is reported. The PC structure succeeded from the silica opals induces bicontinuous framework, stronger optical absorption, and increase in the lifetime of photoexcited charge carriers compared to that of the bulk g-C₃N₄, while the chemical structure remains similar to that of the bulk g-C₃N₄. As such, the g-C₃N₄ PCs have a much higher photodegradation kinetic of methyl orange and photocatalytic hydrogen production rate which is nearly nine times the rate of bulk g-C₃N₄.