Highly Conjugated Graphitic Carbon Nitride Nanofoam for Photocatalytic Hydrogen Evolution

As a metal-free photocatalyst, graphitic carbon nitride (g-CN) shows great potential for photocatalytic water splitting, although its performance is significantly limited by structural defects due to incomplete polymerization. In the present work, we successfully synthesize highly conjugated g-CN na...

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Published in:Langmuir 2022-02, Vol.38 (4), p.1471-1478
Main Authors: Cheng, Chuan-Qi, Feng, Yi, Shi, Zi-Zheng, Zhou, Yun-Long, Kang, Wen-Jing, Li, Zhe, Mao, Jing, Shen, Gu-Rong, Dong, Cun-Ku, Liu, Hui, Du, Xi-Wen
Format: Article
Language:English
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Summary:As a metal-free photocatalyst, graphitic carbon nitride (g-CN) shows great potential for photocatalytic water splitting, although its performance is significantly limited by structural defects due to incomplete polymerization. In the present work, we successfully synthesize highly conjugated g-CN nanofoam through an iodide substitution technique. The product possesses a high polymerization degree, low defect density, and large specific surface area; as a result, it achieves a hydrogen evolution rate of 9.06 mmol h–1 g–1 under visible light irradiation, with an apparent quantum efficiency (AQE) of 18.9% at 420 nm. Experimental analysis and theoretical calculations demonstrate that the recombination of photogenerated carriers at C–NH x defects was effectively depressed in the nanofoam, giving rise to the high photocatalytic activity.
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.1c02716