Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 37, Pages 14253-14261Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c05964
Keywords
conjugated small molecules; photocatalyst; water splitting; hydrogen evolution; single-atom substitution (O, S, Se)
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Funding
- National Natural Science Foundation of China [51432006, 51703166, 51972233]
- Natural Science Foundation of Shanghai [19ZR1459200]
- Ministry of Education [B13025]
- State Administration of Foreign Experts Affairs [B13025]
- Shanghai Municipal Government
- National 1000-Plan Program
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Photocatalytic water splitting has attracted widespread attention as one of the eco-friendly technologies that can scalably produce low-cost renewable solar hydrogen. As a rare case, in this work, we apply organic conjugated small molecules to photocatalytic hydrogen evolution and compare the photocatalytic performance of CM1, CM2, and M1, whose number of N atoms is controlled by replacing the intramolecular electron donor unit with benzene, pyridine, and pyrazole, respectively. There is a clear correlation between the photocatalytic activity and the number of N atoms in the structure, as N atoms can be active sites for the photocatalytic interface reaction and help to improve the water dispersibility and contact of organic conjugated molecules through hydrogen-bonding interactions. In addition, we apply a single-atom substitution strategy (O, S, Se) to control the photoelectric properties of organic conjugated molecules. Among these molecules, M1 exhibits the best performance, even better than the previous series of polymers P2 and P4.
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