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Uniform Generation of Sub-nanometer Silver Clusters in Zeolite Cages Exhibiting High Photocatalytic Activity under Visible Light

Abstract : Sub-nanometer silver clusters that exhibit discrete electronic structure with molecular-like properties are highly desirable in various technologies. However, the methods for their preparation suffer from limitations related with the reproducibility and particles uniformity and/or the possibility of the scale-up. Another critical drawback is that free sub-nanometer silver clusters tend to aggregate into larger particles. In this work, a new approach that successfully overcomes the above limitations is developed. It allows, for the first time, an ultrafast preparation of sub-nanometer silver particles with high abundance, uniformity (7 Å), and stability into the cages of nanosized zeolite crystals. The new method consists of UV excitation of a water suspension of nanozeolite containing photoactive vanadate clusters in the presence of ethanol (as an electron donor) and silver precursor. The characteristic features of sub-nanometer silver particles are presented, and the mechanism of their formation is discussed. Sub-nanometer Ag clusters exhibit exceptional photocatalytic activity and selectivity in the reforming of formic acid to H2 and CO2 under visible light.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-01885083
Contributor : Mohamad El-Roz <>
Submitted on : Monday, October 1, 2018 - 3:53:50 PM
Last modification on : Wednesday, July 15, 2020 - 9:52:05 AM

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Mohamad El-Roz, Igor Telegeiev, Natalia Mordvinova, Oleg Lebedev, Nicolas Barrier, et al.. Uniform Generation of Sub-nanometer Silver Clusters in Zeolite Cages Exhibiting High Photocatalytic Activity under Visible Light. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2018, 10 (34), pp.28702 - 28708. ⟨10.1021/acsami.8b09634⟩. ⟨hal-01885083⟩

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