Article Open Access

Benzene Bridged Carbon Nitride for Efficient Photocatalytic Hydrogen Evolution

Photocatalysis: Research and Potential. 2024, 1(1), 10001; https://doi.org/10.35534/prp.2024.10001
Junxia Chu †,    Wencheng Li †,    Xin Bai    Xi Rao *    Shaohui Zheng *    Yongping Zhang *   
School of Materials and Energy, Southwest University, Chongqing 400715, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.

Received: 23 Nov 2023    Accepted: 01 Jan 2024    Published: 05 Jan 2024   

Abstract

Turing the electronic structure by inserting certain functional groups in graphitic carbon nitride (g-C3N4, CN for short) skeleton through molecular doping is an effective way to improve its photocatalytic performance. Herein, we prepare a benzene bridged carbon nitride (BCN) by calcining urea and 1,3,5-tribromobenzene at elevated temperature. The introduction of benzene ring in g-C3N4 layers improves the separation efficiency and lifetime of photogenerated carriers, inhibits the recombination rate of electron/hole pairs, thus the performance of photocatalytic hydrogen evolution improves. The optimal hydrogen evolution rate of 1.5BCN reaches 1800 µmol/h·g, which is nine times that of the pure g-C3N4. DFT calculation proved the benzene bridged CN increased the distance of charge transfer (DCT) and the push-pull electronic effect of intramolecular electrons. This work may provide a pathway for preparing molecular doped g-C3N4 with improved photocatalytic performance.

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