期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 7, 页码 8945-8953出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b01300
关键词
Photocatalysis; g-C3N4; Hydrogen evolution; Polydopamine; Surface modification
资金
- NSFC [U1705251, 21573170, 51320105001, 21433007]
- Innovative Research Funds of SKLWUT [2017-ZD-4]
- Natural Science Foundation of Hubei Province of China [2015CFA001]
Photocatalytic water splitting is a promising strategy to convert solar energy into chemical energy. Herein, a series of g-C3N4/polydopamine (g-C3N4/PDA) composites were successfully fabricated by in situ polymerization of dopamine on the g-C3N4 surface. Among all the as-prepared composites, the best photocatalytic hydrogen evolution rate of the as-prepared composites was up to 69 mu mol h(-1) under the irradiation of visible light (lambda > 420 nm), which was about 4.5 times than that of pristine g-C3N4 (16 mu mol h(-1)). The enhancement of photocatalytic H-2 evolution is reasonably attributed to the markedly enhanced light harvesting, broadened spectral response range and low onset potential of H-2 production, as well as effective separation and rapid transportation of photogenerated charge carriers. More importantly, the surface modification of g-C3N4 by a small amount of PDA can effectively inhibit the overgrowth of Pt nanoparticles (NPs) during the photocatalytic reactions, which promotes the photoelectron injection and better photocatalytic activity. This work should provide a new insight into preparing metal-free polymer-polymer composites with effective solar energy conversion.
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