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Noble metal-modified faceted anatase titania photocatalysts: Octahedron versus decahedron

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Title: Noble metal-modified faceted anatase titania photocatalysts: Octahedron versus decahedron
Authors: Wei, Zhishun Browse this author
Janczarek, Marcin Browse this author
Endo, Maya Browse this author
Wang, Kunlei Browse this author
Balčytis, Armandas Browse this author
Nitta, Akio Browse this author
Méndez-Medrano, Maria G. Browse this author
Colbeau-Justin, Christophe Browse this author
Juodkazis, Saulius Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Kowalska, Ewa Browse this author →ORCID
Keywords: Noble metal
Faceted anatase titania
Octahedral anatase particle
Decahedral anatase particle
Plasmonic photocatalysis
3D-FDTD simulations
Issue Date: 5-Dec-2018
Publisher: Elsevier
Journal Title: Applied Catalysis B: Environmental
Volume: 237
Start Page: 574
End Page: 587
Publisher DOI: 10.1016/j.apcatb.2018.06.027
Abstract: Octahedral anatase particles (OAP, with eight equivalent {101} facets) and decahedral anatase particles (DAP, with two additional {001} facets) were modified with nanoparticles of noble metals (Au, Ag, Cu). The titania morphology, expressed by the presence of different arrangements of exposed crystal facets, played a key role in the photocatalytic properties of metal-modified faceted titania. In the UV/vis systems, two-faceted configuration of DAP was more favorable for the reaction efficiency than single-faceted OAP because of an efficient charge separation described by the transfer of electrons to {101} facets and holes to {001} facets. Time-resolved microwave conductivity (TRMC) and reversed double-beam photoacoustic spectroscopy (RDB-PAS) confirmed that distribution of electron traps (ET) and mobility of electrons were key-factors of photocatalytic activity. In contrast, metal-modified OAP samples had higher photocatalytic activity than metal-modified DAP and metal-modified commercial titania samples under visible light irradiation. This indicates that the presence of single type of facets ({101}) is favorable for efficient electron transfer via shallow ET, whereas intrinsic properties of DAP result in fast charge carriers’ recombination when gold is deposited on {101} facets (migration of “hot” electrons: Au→{101}→Au).
Rights: © 2018 Zhishun Wei, Marcin Janczarek, Maya Endo, Kunlei Wang, Armandas Balčytis, Akio Nitta, Maria G. Méndez-Medrano, Christophe Colbeau-Justin, Saulius Juodkazis, Bunsho Ohtani, and Ewa Kowalska
https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/70812
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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