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Citation: Yi Yang, Jinsong Wu, Bei Cheng, Liuyang Zhang, Ahmed Abdullah Al-Ghamdi, Swelm Wageh, Youji Li. Enhanced Photocatalytic H2-production Activity of CdS Nanoflower using Single Atom Pt and Graphene Quantum Dot as Dual Cocatalysts[J]. Chinese Journal of Structural Chemistry, ;2022, 41(6): 220600. doi: 10.14102/j.cnki.0254-5861.2022-0124 shu

Enhanced Photocatalytic H2-production Activity of CdS Nanoflower using Single Atom Pt and Graphene Quantum Dot as Dual Cocatalysts

  • 1.

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Nanostructure Research Centre (NRC), Wuhan University of Technology, Wuhan 430070, China

  • 2.

    Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China

  • 3.

    Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

  • 4.

    College of Chemistry and Chemical Engineering, Jishou University, Jishou, Hunan 416000, China

Figures(9)

  • Single-atom catalysts have high catalytic activity due to their unique quantum size effects and optimal atom utilization. Herein, visible-light-responsive photocatalysts were designed by coupling CdS with graphene quantum dots (GQDs) and platinum single atoms (PtSAs). GQDs and PtSAs were successively loaded on ultrathin CdS nanosheets through freeze-drying and in-situ photocatalytic reduction. The synergistic effect between PtSAs and GQDs results in superior photocatalytic activity with a hydrogen production rate of 13488 μmol h-1 g-1 as well as the maximum apparent quantum efficiency (AQE) of 35.5% in lactic acid aqueous solution, which is 62 times higher than that of pristine CdS (213 μmol g-1 h-1). The energy conversion efficiency is ca. 13.05%. As a photosensitizer and an electron reservoir, GQDs can not only extend the light response of CdS to the visible-light region (400-800 nm), but also promotes the separation of photoinduced electron-hole pairs. Meanwhile, PtSAs, with unique electronic and geometric features, can provide more efficient proton reduction sites. This finding provides an effective strategy to remarkably improve photocatalytic H2 production performance.
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