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Size-dependent strong metal-support interaction in TiO₂ supported Au nanocatalysts.

ABSTRACT: The strong metal-support interaction (SMSI) has long been studied in heterogonous catalysis on account of its importance in stabilizing active metals and tuning catalytic performance. As a dynamic process taking place at the metal-support interface, the SMSI is closely related to the metal surface properties which are usually affected by the size of metal nanoparticles (NPs). In this work we report the discovery of a size effect on classical SMSI in Au/TiO₂ catalyst where larger Au particles are more prone to be encapsulated than smaller ones. A thermodynamic equilibrium model was established to describe this phenomenon. According to this finding, the catalytic performance of Au/TiO₂ catalyst with uneven size distribution can be improved by selectively encapsulating the large Au NPs in a hydrogenation reaction. This work not only brings in-depth understanding of the SMSI phenomenon and its formation mechanism, but also provides an alternative approach to refine catalyst performance.

SUBMITTER: Du X

PROVIDER: S-EPMC7669859 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Size-dependent strong metal-support interaction in TiO<sub>2</sub> supported Au nanocatalysts.

Du Xiaorui X Huang Yike Y Pan Xiaoli X Han Bing B Su Yang Y Jiang Qike Q Li Mingrun M Tang Hailian H Li Gao G Qiao Botao B

Nature communications 20201116 1

The strong metal-support interaction (SMSI) has long been studied in heterogonous catalysis on account of its importance in stabilizing active metals and tuning catalytic performance. As a dynamic process taking place at the metal-support interface, the SMSI is closely related to the metal surface properties which are usually affected by the size of metal nanoparticles (NPs). In this work we report the discovery of a size effect on classical SMSI in Au/TiO<sub>2</sub> catalyst where larger Au pa ...[more]

PMID: 33199710

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Project description:This paper reports the synthesis of two-dimensional, hierarchical, porous, and (001)-faceted metal (Ag, Zn, and Al)-doped TiO2 nanostructures (TNSs) and the study of their photocatalytic activity. Two-dimensional metal-doped TNSs were synthesized using the hydrolysis of ammonium hexafluorotitanate in the presence of hexamethylenetetramine and metal precursors. Typical morphology of metal-doped TNSs is a hierarchical nanosheet that is composed of randomly stacked nanocubes (dimensions of up to 5 μm and 200 nm in edge length and thickness, respectively) and has dominant (001) facets exposed. Raman analysis and X-ray photoelectron spectroscopy results indicated that the Ag doping, compared to Zn and Al, much improves the crystallinity degree and at the same time dramatically lowers the valence state binding energy of the TNS and provides an additional dopant oxidation state into the system for an enhanced electron-transfer process and surface reaction. These are assumed to enhance the photocatalytic of the TNS. In a model of photocatalytic reaction, that is, rhodamine B degradation, the AgTNS demonstrates a high photocatalytic activity by converting approximately 91% of rhodamine B within only 120 min, equivalent to a rate constant of 0.018 m-1 and ToN and ToF of 94 and 1.57 min-1, respectively, or 91.1 mmol mg-1 W-1 degradation when normalized to used light source intensity, which is approximately 2 times higher than the pristine TNS and several order higher when compared to Zn- and Al-doped TNSs. Improvement of the crystallinity degree, decrease in the defect density and the photogenerated electron and hole recombination, and increase of the oxygen vacancy in the AgTNS are found to be the key factors for the enhancement of the photocatalytic properties. This work provides a straightforward strategy for the preparation of high-energy (001) faceted, two-dimensional, hierarchical, and porous Ag-doped TNSs for potential use in photocatalysis and photoelectrochemical application.

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Size-dependent strong metal-support interaction in TiO₂ supported Au nanocatalysts.

Publications

Size-dependent strong metal-support interaction in TiO<sub>2</sub> supported Au nanocatalysts.

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Dataset Information

Size-dependent strong metal-support interaction in TiO2 supported Au nanocatalysts.

Publications

Size-dependent strong metal-support interaction in TiO<sub>2</sub> supported Au nanocatalysts.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Size-dependent strong metal-support interaction in TiO₂ supported Au nanocatalysts.