4.7 Article

Sea-urchin-like ReS2 nanosheets with charge edge-collection effect as a novel cocatalyst for high-efficiency photocatalytic H2 evolution

Journal

CHINESE CHEMICAL LETTERS
Volume 33, Issue 2, Pages 943-947

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.07.015

Keywords

Sea-urchin-like ReS2 nanosheets; Charge edge-collection effect; 2D planar edges/tips; Charge transfer; Photocatalytic H-2 evolution

Funding

  1. China Postdoctoral Science Foundation [2019TQ0050, 2020M673186]
  2. Applied Basic Research Program of Sichuan Province [2020YJ0068, 2020ZYD014, 2021YJ0408]
  3. National Natural Science Foundation of China [22002014, 21903084, 52002051]
  4. Fundamental Research Funds for the Central Universities, SCUT [ZYGX2020J009]

Ask authors/readers for more resources

The recombination of charge carriers in semiconductor photocatalysts limits the practical application of solar-driven H-2 evolution. In this study, sea-urchin-like ReS2 nanosheet/TiO2 nanoparticle heterojunctions (SURTHs) were constructed to achieve high charge separation efficiency. The unique sea-urchin-like structure of SURTHs enables an unusual charge edge-collection effect, leading to accelerated charge separation and transfer. As a result, the photocatalytic H-2 evolution rate of SURTHs is significantly improved compared to P25 TiO2.
The recombination of charge carriers arriving from the random charge movement in semiconductor photocatalysts greatly limits the practical application of solar-driven H-2 evolution. The design of photocatalytic systems with spatially oriented charge-transfer is a promising route to achieve high chargeseparation efficiency for photocatalysts. Herein, novel sea-urchin-like ReS2 nanosheet/TiO2 nanoparticle heterojunctions (SURTHs) are constructed. The unique sea-urchin-like structure endows the ReS2 cocatalyst with an unusual charge edge-collection effect, which leads to a significant acceleration of charge separation and transfer, as evidenced by the well-designed selective photodeposition of Pt quantum dots in SURTHs. The markedly improved charge transfer capacity contributes to a high photocatalytic H-2 evolution rate of 3.71 mmol h(-1) g(-1) for SURTHs (an apparent quantum efficiency (AQE) of 16.09%), up to 231.9 times by contrast with that of P25 TiO2. This work would provide a new platform for designing the high-efficiency cocatalyst/photocatalyst system with excellent charge transfer capacity. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

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