4.8 Article

Unidirectional/Bidirectional Electron Transfer at the Au/TiO2 Interface Operando Tracked by SERS Spectra from Au and TiO2

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 14, 页码 16498-16506

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02540

关键词

operando SERS; photocatalysis; p-nitrothiophenol; Mott-Schottky (M-S) junction; charge transfer

资金

  1. National Natural Science Foundation of China [21972040, 21673073]
  2. Science and Technology Commission of Shanghai Municipality [18520710200, 20DZ2250400]
  3. Shanghai Pujiang Program [18PJD012]
  4. Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
  5. Program of Introducing Talents of Discipline to Universities [B20031, B16017]

向作者/读者索取更多资源

This study used operando SERS spectroscopy to investigate the electron transfer dynamics and direction at the Au/TiO2 interface, revealing the size-dependent unidirectional/bidirectional transfer of photoinduced electrons and enabling rational tuning of reduction selectivity in metal/semiconductor composites.
Although it is well-known that the size can influence the surface plasmon resonance property of coinage metals and the electronic state of the Mott-Schottky junction formed at the metal/semiconductor interface, insights into how the size can be exploited to optimize the photocatalytic activity and selectivity of metal/semiconductor composites are lacking. Here we utilize operando SERS spectroscopy to identify the size effect on the electron-transfer dynamics and the direction at the Au/TiO2 interface. This effect was characterized by the photocatalytic reduction sites of p-nitrothiophenol, which were self-tracked with the SERS spectra from Au nanoparticle and inverse-opal structured TiO2, respectively. The size-dependent unidirectional/bidirectional transfer of photoinduced electrons at the Au/TiO2 interface was revealed by operando SERS spectroscopy, which enables the rational tuning of the reduction selectivity.

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