am8b09634_si_001.pdf (5.21 MB)
Uniform Generation of Sub-nanometer Silver Clusters in Zeolite Cages Exhibiting High Photocatalytic Activity under Visible Light
journal contributionposted on 2018-08-06, 00:00 authored by Mohamad El-Roz, Igor Telegeiev, Natalia E. Mordvinova, Oleg I. Lebedev, Nicolas Barrier, Asma Behilil, Moussa Zaarour, Louwanda Lakiss, Valentin Valtchev
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.
Visible Light Sub-nanometer silver clustersphotoactive vanadate clustersparticles uniformitySub-nanometer Ag clusters exhibitUniform Generationwater suspensionsub-nanometer silver clustersnanosized zeolite crystalsSub-nanometer Silver Clustersmolecular-like propertieselectron donormethodH 2CO 2limitationultrafast preparationZeolite Cages Exhibiting High Photocatalytic Activitysub-nanometer silver particlesformic acidsilver precursorphotocatalytic activityUV excitation