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Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts : Overview and Perspective

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Title: Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts : Overview and Perspective
Authors: Wang, Kunlei Browse this author
Janczarek, Marcin Browse this author
Wei, Zhishun Browse this author
Raja-Mogan, Tharishinny Browse this author
Endo-Kimura, Maya Browse this author
Khedr, Tamer M. Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Kowalska, Ewa Browse this author →ORCID
Keywords: anatase
photonic crystal
mixed-phase titania
faceted titania
inverse opal
Issue Date: Dec-2019
Journal Title: Catalysts
Volume: 9
Issue: 12
Start Page: 1054
Publisher DOI: 10.3390/catal9121054
Abstract: Titania photocatalysts have been intensively examined for both mechanism study and possible commercial applications for more than 30 years. Although various reports have already been published on titania, including comprehensive review papers, the morphology-governed activity, especially for novel nanostructures, has not been reviewed recently. Therefore, this paper presents novel, attractive, and prospective titania photocatalysts, including zero-, one-, two-, and three-dimensional titania structures. The 1D, 2D, and 3D titania structures have been mainly designed for possible applications, e.g., (i) continuous use without the necessity of particulate titania separation, (ii) efficient light harvesting (e.g., inverse opals), (iii) enhanced activity (fast charge carriers’ separation, e.g., 1D nanoplates and 2D nanotubes). It should be pointed out that these structures might be also useful for mechanism investigation, e.g., (i) 3D titania aerogels with gold either incorporated inside the 3D network or supported in the porosity, and (ii) titania mesocrystals with gold deposited either on basal or lateral surfaces, for the clarification of plasmonic photocatalysis. Moreover, 0D nanostructures of special composition and morphology, e.g., magnetic(core)–titania(shell), mixed-phase titania (anatase/rutile/brookite), and faceted titania NPs have been presented, due to their exceptional properties, including easy separation in the magnetic field, high activity, and mechanism clarification, respectively. Although anatase has been usually thought as the most active phase of titania, the co-existence of other crystalline phases accelerates the photocatalytic activity significantly, and thus mixed-phase titania (e.g., famous P25) exhibits high photocatalytic activity for both oxidation and reduction reactions. It is believed that this review might be useful for the architecture design of novel nanomaterials for broad and diverse applications, including environmental purification, energy conversion, synthesis and preparation of “intelligent” surfaces with self-cleaning, antifogging, and antiseptic properties.
Type: article
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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