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Minuscule Amounts of Pt Single Atoms Selectively Loaded on Minor (101) Facet of Anatase Crystallites Enables Outstanding Utilization Efficiency for Photocatalytic H2 Production
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DOI：10.1002/adfm.202423088.png)
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Abstract
En 中文
Pt single atoms (SAs) on TiO2 have been identified as effective co-catalysts in solar photocatalytic H-2 production. In this study, Pt SAs is deposited on single crystal anatase nanosheets (NSs) with minor (101) and major (001) facets and expose them to various thermal treatments in air, Ar, and Ar-H-2 environments. It is found that through Ar-H-2 annealing Pt-species can be accumulated exclusively on the minor (101) facets, i.e., they can be concentrated selectively on the facet where electron exit occurs. This optimally establishes a high photocatalytic H-2 evolution efficiency for an extremely low overall Pt SA loading of approximate to 0.005 wt.% on the anatase crystallites. For this most active SA placement, 11.7 mmol g(-1) h(-1) H-2 production is obtained with a turnover frequency (TOF) up to 253 #H-2 site(-1) s(-1). Note that the corresponding Pt SAs density of 3.1 x 10(4) atoms mu m(-2) is established by loading from only 0.2 mu m Pt solution. These findings demonstrate that placing a very low density of Pt SAs as an electron transfer co-catalyst onto the electron exit sites of a light-harvesting structure (i.e., there where it is needed) can provide a most active photocatalytic structure with an outstanding Pt utilization.
Keywords:
hydrogen evolution
photocatalysis
platinum
single-atom catalysts
TiO2 facets
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