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Hantzsch ester as hole relay significantly enhanced photocatalytic hydrogen production

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Abstract

Polymeric graphitic carbon nitride (g-C3N4) has emerged as a promising semiconductor photocatalytic material, which can convert solar energy into chemical energy under visible-light irradiation. However, because of the issue of recombination of photogenerated electron–hole pairs, the photocatalytic efficiency of g-C3N4 is dissatisfactory. Herein, we constructed a novel system of graphitic-C3N4 composite photocatalyst (C3N4/DHPE) through π–π interactions and hydrogen bonds for efficient visible light-driven H2 evolution. The Hantzsch ester (diethyl 1,4-dihydro-2,6-3,5-pyridine dicarboxylate, denoted as DHPE) not only speeds up the transfer rate of photogenerated charge carriers, but also retards the recombination of electron–hole pairs through extracting holes from g-C3N4. C3N4/DHPE hybrid photocatalyst exhibits efficient spatial separation of photogenerated electrons and holes and thus, more electrons can be released for hydrogen production. When 4% DHPE was introduced, the hydrogen production rate of C3N4/DHPE photocatalyst drastically increased up to 1345.0 μmol h−1 g−1, which is 4.7 times higher than that of pure g-C3N4 (286.0 μmol h−1 g−1). Moreover, there is no significant decrease in H2 production after a long time reaction (20 h, five test cycles), confirming that the C3N4/DHPE photocatalyst has excellent stability. Our study offers a simple, cost-effective, and powerful route to promoting efficient separation of photogenerated charge carriers and a novel strategy to design other highly efficient photocatalytic systems for solar energy conversion.

Graphical abstract: Hantzsch ester as hole relay significantly enhanced photocatalytic hydrogen production

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Publication details

The article was received on 14 Sep 2018, accepted on 23 Oct 2018 and first published on 23 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01922C
Citation: Catal. Sci. Technol., 2018, Advance Article
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    Hantzsch ester as hole relay significantly enhanced photocatalytic hydrogen production

    L. Ma, Y. Liu, K. Liang, X. Fang, S. Sahar, M. Kombo and A. Xu, Catal. Sci. Technol., 2018, Advance Article , DOI: 10.1039/C8CY01922C

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