Chinese Journal of Catalysis ›› 2023, Vol. 46: 72-83.DOI: 10.1016/S1872-2067(22)64192-5

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In-situ formation of electron-deficient Pd sites on AuPd alloy nanoparticles under irradiation enabled efficient photocatalytic Heck reaction

Haifeng Wanga, Fan Wangb, Xiaopeng Lia, Qi Xiaoa,*(), Wei Luoa, Jingsan Xuc,*()   

  1. aState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    bLeibniz-Institut für Katalyse e.V. an der Universität Rostock, Rostock 18059, Germany
    cSchool of Chemistry and Physics & Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4001, Australia
  • Received:2022-09-25 Accepted:2022-11-04 Online:2023-03-18 Published:2023-02-21
  • Contact: *E-mail: qi.xiao@dhu.edu.cn (Q. Xiao), jingsan.xu@qut.edu.au (J. Xu)
  • About author:

    1Contributed equally to this work.

  • Supported by:
    Shanghai Pujiang Program(21PJ1400400);The Research Start‐up Fund at Donghua University, the FundamentalResearch Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(CUSF-DH-D-2022006)

Abstract:

Plasmonic metal nanoparticles have emerged as important candidates for photocatalysis. Numerous studies have shown that coupling of a plasmonic component (such as Au) as the light energy harvester with a catalytically active metal component (such as Pd) to form hybrid or alloy structures could achieve enhanced catalytic performance. However, the microscopic mechanism relative to the multicomponent plasmonic photocatalysis is still elusive. Here, we find that the electron-deficient Pd sites (Pdδ+) on AuPd alloy nanoparticle were formed under visible light irradiation, which play a decisive role in the AuPd alloy nanoparticle photocatalysis. The in-situ formed Pdδ+ under irradiation offers ideal platform for the catalytic reaction which is comparable to that under thermal heating conditions (>100 °C). The AuPd alloy nanoparticles show excellent conversion and selectivity for visible-light-driven Heck cross-coupling reaction under ambient conditions. The combination of experimental and density functional theory results suggest that the photocatalytic Heck reaction proceeds via a new radical-based single-electron transfer pathway on the AuPd alloy, and the in-situ formed Pdδ+ sites ideally provided efficient catalytic sites for the activation of reactant with much lower activation energy barrier under irradiation. The present work sheds light on the new mechanistic understandings of bimetallic plasmonic photocatalysis.

Key words: Plasmonic photocatalysis, AuPd alloy, Electron-deficient Pd, Surface charge state, Photocatalytic Heck reaction