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A gradual carbon doping graphitic carbon nitride towards the metal-free visible light photocatalytic hydrogen evolution

Abstract

The efficient and economical photocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required to replace the expensive metal-based catalysts used in water splitting devices. Herein, we have developed an inexpensive route to synthesize a carbon-rich graphitic carbon nitride (C-rich g-C3N4) with both nitrogen vacancies and porous structure, which, as a highly efficient photo-induced water splitting catalyst, can meet current demands. The effects of porous structure, nitrogen vacancies, and rich carbon on the electronic band structure and charge transport of g-C3N4 are systematically elucidated. The C-rich g-C3N4 can not only effectively enhance the absorption of visible light, but also expedite the majority carrier mobility, and promote the photoelectron transport through the defects-induced midgap and multiple conductive carbon rings, synergistically elongating the photocarriers diffusion length and lifetime. Importantly, the metal-free C-rich g-C3N4 photocatalyst not only shows a higher solar-driven hydrogen production performance, which exceeds 20.5 times than the pristine g-C3N4, but also exhibits an outstanding stability with minimal loss of catalytic activity.

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Publication details

The article was received on 11 Apr 2018, accepted on 10 Jul 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA03303J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    A gradual carbon doping graphitic carbon nitride towards the metal-free visible light photocatalytic hydrogen evolution

    Z. Chen, T. Fan, X. Yu, W. Qiuling, Q. Zhu, L. Zhang, J. Li, W. Fang and X. Yi, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03303J

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