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Wavelength-sensitive photocatalytic H<inf>2</inf> evolution from H<inf>2</inf>S splitting over g-C<inf>3</inf>N<inf>4</inf> with S,N-codoped carbon dots as the photosensitizer

Xie, Z and Yu, S and Fan, XB and Wei, S and Yu, L and Zhong, Y and Gao, XW and Wu, F and Zhou, Y (2021) Wavelength-sensitive photocatalytic H<inf>2</inf> evolution from H<inf>2</inf>S splitting over g-C<inf>3</inf>N<inf>4</inf> with S,N-codoped carbon dots as the photosensitizer. Journal of Energy Chemistry, 52. pp. 234-242. ISSN 2095-4956

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Abstract

Photocatalytic splitting of hydrogen sulfide (H S) for hydrogen evolution is a promising method to solve the energy and environmental issues. In this work, S,N-codoped carbon dots (S,N-CDs)/graphitic carbon nitride (g-C N ) nanosheet is synthesized by hydrothermal method as an efficient photocatalyst for the decomposition of H S. In addition to the characterization of the morphology and structure, chemical state, optical and electrochemical performances of S,N-CDs/g-C N , hydrogen evolution tests show that the activity of g-C N is improved by introducing S,N-CDs, and the enhancement depends strongly on the wavelength of incident light. The photocatalytic hydrogen production rate of S,N-CDs/g-C N composite reaches 832 μmol g h , which is 38 times to that of g-C N under irradiation at 460 nm. Density functional theory calculations and electron paramagnetic resonance as well as photoluminescence technologies have altogether authenticated that the unique wavelength-dependent photosensitization of S,N-CDs on g-C N ; meanwhile, a good match between the energy level of S,N-CDs and g-C N is pivotal for the effective photocatalytic activity. Our work has unveiled the detailed mechanism of the photocatalytic activity enhancement in S,N-CDs/g-C N composite and showed its potential in photocatalytic splitting of H S for hydrogen evolution. 2 3 4 2 3 4 3 4 3 4 3 4 3 4 3 4 3 4 2 −1 −1

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 04 Jun 2020 02:32
Last Modified: 13 Apr 2021 10:27
DOI: 10.1016/j.jechem.2020.04.051