Dai Anna, Huang Zhenxiong, Tian Li, Zhang Ziying, Guan Xiangjiu, Guo Liejin
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an, Shaanxi 710049, PR China.
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an, Shaanxi 710049, PR China; Institute of Energy Research, Jiangxi Academy of Sciences, No. 7777 Changdong Avenue, Nanchang 330096, PR China.
J Colloid Interface Sci. 2022 Sep 15;622:494-502. doi: 10.1016/j.jcis.2022.04.159. Epub 2022 Apr 30.
Developing and employing photocatalysts with extended visible-light-absorption has emerged as a fundamental issue for the enhanced capability of photocatalytic H evolution from water splitting. Herein, a wide-spectrum light-responsive phenyl-grafted carbon nitride photocatalyst was synthesized. It was found that benzonquanmine-derived g-CN (BCN) exhibits significantly extended light absorption (∼670 nm) compared with conventional melamine-derived g-CN (MCN). Correspondingly, the photocatalytic H-evolution rate of BCN (2846 μmol h g) is five times as that of MCN under visible-light irradiation. Particularly, an impressive H-evolution rate of 58 μmol h g could be achieved on BCN even under light irradiation beyond 620 nm. The outstanding photocatalytic H-evolution performance could be not only attributed to the enriched photons generated from the enhanced solar energy harvesting, but also to the distinctly inhibited rapid recombination of photogenerated electron-hole pairs resulting from the incorporation of phenyl groups. This work furnishes a new train of thought for the designing of carbon-nitride-based photocatalysts with enhanced capability of visible-light-utilization.
开发和使用具有扩展可见光吸收能力的光催化剂，已成为提高光催化水分解产氢能力的一个基本问题。在此，合成了一种宽光谱光响应的苯基接枝氮化碳光催化剂。研究发现，与传统三聚氰胺衍生的g-CN（MCN）相比，苯甲酰胺衍生的g-CN（BCN）具有显著扩展的光吸收（~670 nm）。相应地，在可见光照射下，BCN的光催化产氢速率（2846 μmol h g）是MCN的五倍。特别地，即使在620 nm以上的光照下，BCN上也能实现令人印象深刻的58 μmol h g的产氢速率。优异的光催化产氢性能不仅归因于增强的太阳能捕获产生的丰富光子，还归因于苯基的引入显著抑制了光生电子-空穴对的快速复合。这项工作为设计具有增强可见光利用能力的氮化碳基光催化剂提供了新的思路。
