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Conjugated polymer dots/graphitic carbon nitride nanosheet heterojunctions for metal-free hydrogen evolution photocatalysis

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Abstract

Graphitic carbon nitride (g-C3N4)-based heterojunctions have been widely applied to photocatalytic hydrogen evolution. However, most of the g-C3N4-based heterojunctions still require the incorporation of noble metal co-catalysts for hydrogen evolution. Based on the excellent prolonged excited state lifetime, tunable optical properties, appropriate bandgap of conjugated polymer dots (Pdots) and unique few-layered g-C3N4 nanosheets with porous structures, in this study, polyfluorene Pdots are facilely coupled with g-C3N4 nanosheets to form organic heterojunctions. The poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) Pdots/g-C3N4 nanosheet heterojunctions can significantly extend the light-absorption range and promote the electron–hole pair separation, leading to an enhanced hydrogen evolution rate up to 929.3 μmol h−1 g−1 with an apparent quantum yield of 5.7% at 420 nm without any metallic co-catalyst. This approach can provide a facile and operable fabrication technique for high performance photocatalysts, optical sensors and photoelectric devices in a sustainable way.

Graphical abstract: Conjugated polymer dots/graphitic carbon nitride nanosheet heterojunctions for metal-free hydrogen evolution photocatalysis

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Publication details

The article was received on 09 Oct 2018, accepted on 20 Nov 2018 and first published on 22 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09735F
Citation: J. Mater. Chem. A, 2019, Advance Article
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    Conjugated polymer dots/graphitic carbon nitride nanosheet heterojunctions for metal-free hydrogen evolution photocatalysis

    W. Zhou, T. Jia, H. Shi, D. Yu, W. Hong and X. Chen, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA09735F

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