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Vacancy-defect semiconductor quantum dots induced an S-scheme charge transfer pathway in 0D/2D structures under visible-light irradiation

Bi, F; Su, Y; Zhang, Y; Chen, M; Darr, JA; Weng, X; Wu, Z; (2022) Vacancy-defect semiconductor quantum dots induced an S-scheme charge transfer pathway in 0D/2D structures under visible-light irradiation. Applied Catalysis B: Environmental , 306 , Article 121109. 10.1016/j.apcatb.2022.121109. Green open access

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Abstract

Designing heterojunctions with a feasible charge transfer pathway is a promising strategy for establishing highly efficient artificial photosystems. The step-scheme (S-scheme) heterojunction has shown considerable potential in enhancing redox ability and charge transfer of photocatalysts. Herein, a hierarchical heterojunction involving vacancy-defect TiO2 quantum dots (QDs) and 2D g-C3N4 nanosheets was constructed using a multi-step assembly strategy. Computational and experimental studies show that the vacancy-defect TiO2 QDs can induce an S-scheme charge transfer pathway in the 0D/2D heterojunction under visible-light irradiation, which greatly improved the redox ability of charge carriers, enhanced the charge transfer and separation at interfaces, and facilitated the H2O adsorption and dissociation. This results in over 10-fold increase in hydrogen evolution reaction (HER) of photocatalytic water splitting for a wide range of carbon nitrides. The values achieved compare favorably with the best carbon nitride photocatalysts developed to date.

Type: Article
Title: Vacancy-defect semiconductor quantum dots induced an S-scheme charge transfer pathway in 0D/2D structures under visible-light irradiation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apcatb.2022.121109
Publisher version: https://doi.org/10.1016/j.apcatb.2022.121109
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Engineering, Environmental, Engineering, Chemical, Chemistry, Engineering, S-scheme, Quantum dots, Defect, TiO2, Photocatalysis, CARBON NITRIDE, NANOSHEETS, PHOTOCATALYST, G-C3N4, WATER, TIO2, HETEROJUNCTION, PHASE, ACID
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10156983
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