Photoresponses of Supported Au Single Atoms on TiO2 (110) through the Metal-Induced Gap States

The Journal of Physical Chemistry Letters
Shihui DongBing Wang

Abstract

When a metal single-atom (SA) catalyst is supported on a semiconducting photocatalyst, the charge transfer of the photoexcited carriers to metal SAs can provide a synergetic activity for the co-catalysts. Here, we report the interfacial electronic coupling of the Au SAs on the TiO2(110) surface using scanning tunneling microscopy/spectroscopy, in combination with first-principles calculations. Distinct energy and spatial distributions of the metal-induced gap states (MIGSs) are experimentally revealed for the Au SAs adsorbed at the terminal Ti sites and the oxygen vacancies. The localized MIGS below the Fermi level provides a dedicated channel for the transfer of a photoexcited hole from the TiO2 substrate to the adsorbed Au SAs. The hole can weaken the Ti-Au bonding and activate the diffusion of Au SAs. Our results shed light on combining the advantages of photocatalysis and metal SA catalysis using a co-catalyst, which is promising to promote chemical reactions at low temperatures.

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Citations

Feb 10, 2020·The Journal of Chemical Physics·Ewa MadejNika Spiridis
Aug 26, 2021·The Journal of Physical Chemistry Letters·Chi-Ming YimGeoff Thornton
Oct 22, 2020·Chemical Reviews·Selina K KaiserJavier Pérez-Ramírez

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