Anatase TiO<sub>2</sub> Crystals with Exposed High‐Index Facets

Jiang, Hai Bo; Cuan, Qian; Wen, Cun; Xing, Jun; Wu, Di; Gong, Xue‐Qing; Li, Chunzhong; Yang, Hua Gui

doi:10.1002/anie.201007771

Cited by 165 publications

(108 citation statements)

References 28 publications

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“…The presence of mounds is evidence of the predominance of the TiCl 4 vapor surface oxidation pathway in the reaction zone at high C TiCl4(g) , low LSR and low F/T ratio [44]. Mounds have two possible functions: i) as surface starting points for the growth of new decahedral crystals and ii) as a possible "embryo" of high-index facets as suggested by Jiang et al [50]. It was reported that the embryo that arose during the gas-phase preparation process resulted in the formation of crystal facets indexed as {105} and {107}.…”

Section: Particle Morphologymentioning

confidence: 87%

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Janczarek

Kowalska

Ohtani

2016

Chemical Engineering Journal

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Decahedral-shaped anatase particles (DAPs) were prepared by a gas-phase process consisting of titanium(IV) chloride oxidation. The use of a coaxial-flow gas-phase reactor resulted in high reaction yield (ca. 70%) and good reproducibility of DAPs production. The influence of controlled and resultant preparation parameters on the process course and on DAPs properties (such as specific surface area, particle size and particle morphology) is discussed in detail.Correlations between preparation parameters and product properties indicated the best conditions for obtaining DAPs of high quality and thus with a high level of photocatalytic activity for various reaction systems.Keywords: anatase titania, decahedral-shaped particles, gas-phase synthesis, coaxial-flow reactor, photocatalytic activityconcentration of TiCl 4 vapor in gas phase (vol%) amount of powder collected from the glassfiber filter (g) length of the reaction zone (m) line speed ratio of reactant gases internal pressure (kPa) particle aspect ratio primary particle size (nm) particle shape distribution (%) particle size heterogeneity radial distance (m) reaction tube radius (m) Reynolds numbersecondary particle size (nm) specific surface area (m 2 g -1 ) amount of powder collected from the reaction tube (g) furnace temperature (K) residence time (s) average volumetric flow rate of the gas mixture (m 3 s -1 ) volumetric flow rate of argon (m 3 s -1 ) volumetric flow rate of oxygen (m 3 s -1 ) volumetric flow rate of TiCl 4 vapor (m 3 s -1 ) volumetric flow rate of TiCl 4 liquid (m 3 s -1 ) viscosity of the gas mixture (Pa s) density of the gas mixture (kg m -3 )

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Section: Particle Morphologymentioning

confidence: 87%

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Janczarek

Kowalska

Ohtani

2016

Chemical Engineering Journal

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“…Yang and co-workers [79] presented the synthesis of anatase TiO 2 crystals with {105} high-index surfaces, as shown in Fig. 16.…”

Section: Metal Oxide Nanocrystals With High-index Surfacesmentioning

confidence: 97%

“…Recently, several groups have reported the synthesis of metal oxide nanocrystals with high-index surfaces [78][79][80].…”

Section: Metal Oxide Nanocrystals With High-index Surfacesmentioning

confidence: 99%

Shape-Controlled Nanocrystals for Catalytic Applications

et al. 2011

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The activity, selectivity, and long-term stability of catalyst nanoparticles can be enhanced by shape modulation. Such shaped catalytic nanocrystals have welldefined surface crystalline structures on which the cleavage and recombination of chemical bonds can be rationally controlled. Metal and metal oxide nanocrystals have been synthesized in various shapes using wet chemistry techniques such as reducing metal precursors in the presence of the surface-capping agents. The surface-capping agents should be removed prior to the catalytic chemical reaction, which necessitates clean catalytically active surface. The removal process should be performed very carefully because this removal often causes shape deformation.A few examples in which the surface-capping agents contribute positively to the chemical reactions have been reported. The examples described in this review include shaped metal, metal composite, and metal oxide nanocrystals that show enhanced catalytic activity, selectivity, and long-term stability for various gas-phase, liquid-phase, or electrocatalytic reactions. Although most of the studies using these shaped nanocrystals for catalytic applications have focused on low-index surfaces, nanocrystals with high-index facets and their catalytic applications have recently been reported. By bridging surface studies with nanoparticle catalysts using shape modulation, catalysts with improved properties can be rationally designed.

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“…The key to produce higher-energy facet is to lower its surface energy. The breakthrough was made by Yang [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Controlling Tio 2 Facetsmentioning

confidence: 99%

Controlling surface and interface of TiO2 toward highly efficient photocatalysis

et al. 2015

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Anatase TiO₂ Crystals with Exposed High‐Index Facets

Cited by 165 publications

References 28 publications

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Shape-Controlled Nanocrystals for Catalytic Applications

Controlling surface and interface of TiO2 toward highly efficient photocatalysis

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Anatase TiO2 Crystals with Exposed High‐Index Facets

Cited by 165 publications

References 28 publications

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Shape-Controlled Nanocrystals for Catalytic Applications

Controlling surface and interface of TiO2 toward highly efficient photocatalysis

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Product

Resources

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Anatase TiO₂ Crystals with Exposed High‐Index Facets