期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 608, 期 -, 页码 284-293出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.09.103
关键词
Photocatalytic hydrogen evolution; Heterojunction interface; Black phosphorous quantum dots; ZnIn2S4
By anchoring two-dimensional layered black phosphorous quantum dots (BPQDs) onto two-dimensional ZnIn2S4 nanosheets, a unique interface is formed to ensure sufficient contact area, facilitating the transport and spatial separation of photogenerated electrons and holes. The synergistic effect of sulfur vacancies and type-II heterojunction results in excellent photocatalytic hydrogen evolution performance of the BPQDs/V-ZIS composites.
The emergence of two dimensional (2D) nanosheets provides flexible platforms for the construction of semiconductor heterostructures for photocatalytic hydrogen evolution. However, the compact and conformal contact between the components with different dimensions remains challenge. Herein, we anchor the 2D layered black phosphorous quantum dots (BPQDs) onto the 2D ZnIn2S4 nanosheets with sulfur vacancies (V-ZIS). This unique interface between 2D layered QDs and 2D nanosheets ensures a sufficient contact area between the BPQDs and the V-ZIS, which is conducive to the transport and the spatial separation of photogenerated electrons and holes. A synergistic effect of sulfur vacancies and type-II heterojunction results in an excellent photocatalytic hydrogen evolution performance of the BPQDs/V-ZIS composites. The hydrogen evolution rate by the BPQDs/V-ZIS without any noble-metal as cocatalyst is up to 5079 mu mol g(-1)h(-1) under visible light irradiation with an apparent quantum yield (AQY) of 12.03% at 420 nm, which is dramatically higher than most other photocatalysts reported previously. (C) 2021 Elsevier Inc. All rights reserved.
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