期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 43, 页码 13445-13449出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201706870
关键词
carbon nitride; exciton dissociation; H-2 production; van der Waals stacking; water splitting
资金
- Alexander von Humboldt Foundation
- Max Planck Society
- National Basic Research Program of China [2013CB632405]
- National Natural Science Foundation of China [21425309, 21761132002]
- 111 Project
Polymeric or organic semiconductors are promising candidates for photocatalysis but mostly only show moderate activity owing to strongly bound excitons and insufficient optical absorption. Herein, we report a facile bottom-up strategy to improve the activity of a carbon nitride to a level in which a majority of photons are really used to drive photoredox chemistry. Co-condensation of urea and oxamide followed by post-calcination in molten salt is shown to result in highly crystalline species with a maximum - layer stacking distance of heptazine units of 0.292nm, which improves lateral charge transport and interlayer exciton dissociation. The addition of oxamide decreases the optical band gap from 2.74 to 2.56eV, which enables efficient photochemistry also with green light. The apparent quantum yield (AQY) for H-2 evolution of optimal samples reaches 57% and 10% at 420nm and 525nm, respectively, which is significantly higher than in most previous experiments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据