Journal
CHEMICAL ENGINEERING JOURNAL
Volume 412, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128749
Keywords
Single-atom; Carbon nitride; Pt-N bond bridge; Charge transfer; Photocatalytic hydrogen production
Categories
Funding
- National Key RAMP
- D Program of China [0208300, 0700104]
- National Natural Science Foundation of China [21671180]
- Postdoctoral Science Foundation of China [2019M653008]
- CAS Fujian Institute of Innovation
- DNL Cooperation Fund [DNL201918]
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The introduction of atomically dispersed Pt in graphitic carbon nitride as Pt SAs/C3N4 photocatalyst, with Pt-N bonds serving as a bridge for electron transfer, significantly improves the photocatalytic efficiency for hydrogen evolution.
Graphitic carbon nitride (C3N4) has gained considerable attention regarding as ideal candidates for water splitting photocatalysis. However, its photocatalytic efficiency is still quite unsatisfactory due to the serious charge-carrier recombination and limited number of active sites. To overcome its bottleneck, herein, we fabricate an atomically Pt-dispersed C3N4 (Pt SAs/C3N4) photocatalyst, in which Pt?N bonds serve as a bridge for direct migration of photoexcited electrons from C3N4 to Pt active sites. The bridging Pt?N bond shortens the electronic transfer distance and improves the charge separation, thus accelerating the photocatalytic H2 evolution performance. The H2 evolution performance of Pt SAs/C3N4 photocatalyst (573.6 ?mol h-1) is remarkably improved by two orders of magnitude compared to pristine C3N4 (6.1 ?mol h-1). The spatial separation of photogenerated charges promoted by Pt?N bonds were well proved by both empirical characterizations and theoretical calculations.
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