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Engineering Heteroatom with Atomic Precision in Donor-Acceptor Covalent Triazine Frameworks to Boost Photocatalytic Hydrogen Production

Abstract

Porous organic polymers (POPs) with conjugated structures, high surface areas and variable building blocks are shown to possess enormous potentials in photocatalytic hydrogen evolution. However, photocatalytic performances of most POPs are impeded by insufficient charge transfer and rapid charge recommbination. Herein, based on covalent triazine frameworks (CTFs), we show a strategy to boost the photocatalytic performance by enhancing charge transfer/separation, where the donors can be easily tailored through substuituting different heteroatoms with atomic precision in a series of donor-acceptor CTFs, resulting in optimal energy levels and enhanced charge transfer ability. Among them, the N-doped fluorene (carbazole) bearing strongest donor ability achieves the highest photocatlaytic performance among POPs, with an exceptional high hydrogen evolution rate up to 10760 μmol h-1 g-1 under visible light irradiation. Photophysical and electrochemical studies reveal the high photocatalytic performance are attributed to high charge transfer efficency and low charge recommbination in these heteroatom-doped donor-acceptor CTFs. The work demonstrates that adjusting push-pull interaction between donor and acceptor via heteroatom engineering is an effective strategy to increase photocatalytic perofrmance.

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Publication details

The article was received on 31 Jul 2018, accepted on 11 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07391K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Engineering Heteroatom with Atomic Precision in Donor-Acceptor Covalent Triazine Frameworks to Boost Photocatalytic Hydrogen Production

    L. Guo, Y. Niu, H. Xu, Q. Li, S. Razzaque, Q. Huang, B. Tan and S. Jin, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07391K

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