期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 237, 期 -, 页码 574-587出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.06.027
关键词
Noble metal; Faceted anatase titania; Octahedral anatase particle; Decahedral anatase particle; Plasmonic photocatalysis; 3D-FDTD simulations
资金
- Grand Challenges Explorations Grant from Bill and Melinda Gates Foundation [GCE R8, OPP1060234]
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).
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