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Updated: Nov 3, 2025

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
Published on: August 18, 2020
Photoinduced Strong Metal-Support Interaction for Enhanced Catalysis
Hao Chen1, Zhenzhen Yang2, Xiang Wang2
1Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States.
Photochemistry enables strong metal-support interaction (SMSI) construction for robust nanocatalysts at room temperature. This UV-driven method enhances catalytic hydrogenation efficiency for palladium/titanium dioxide (Pd/TiO2) systems.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Strong metal-support interaction (SMSI) is crucial for thermally stable nanocatalysts in industrial applications.
- Traditional SMSI construction requires high temperatures (>300 °C) and specific gas atmospheres.
- Developing milder conditions for SMSI is essential for broader applicability.
Purpose of the Study:
- To demonstrate a photochemistry-driven methodology for SMSI construction under ambient conditions.
- To investigate the mechanism of UV-induced SMSI formation.
- To evaluate the catalytic performance of the photochemically constructed SMSI.
Main Methods:
- Utilized UV irradiation to induce SMSI in Pd/TiO2 systems.
- Analyzed nanoparticle encapsulation, Ti3+ species formation, and CO adsorption suppression.
- Investigated the role of photoinduced electrons and holes in SMSI formation.
- Extended the methodology to Pd/ZnO and Pt/TiO2 systems.
Main Results:
- Achieved encapsulation of Pd nanoparticles with a TiO2 overlayer under ambient conditions via UV irradiation.
- Observed the formation of Ti3+ species and oxygen vacancies (Ov).
- Established interfacial Pd-Ov-Ti3+ sites, indicating SMSI.
- Demonstrated enhanced catalytic hydrogenation efficiency for the Pd/TiO2 system.
- Confirmed the reversibility of the constructed SMSI layer.
Conclusions:
- Photochemistry offers a novel, low-temperature route for SMSI construction.
- The UV-driven process effectively creates robust Pd/TiO2 nanocatalysts with improved hydrogenation activity.
- The methodology is versatile and applicable to other metal-oxide systems like Pd/ZnO and Pt/TiO2.
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