A Yolk@Shell Nanoarchitecture for Au/TiO<sub>2</sub> Catalysts

Lee, Ilkeun; Joo, Ji Bong; Yin, Yadong; Zaera, Francisco

doi:10.1002/anie.201007660

Cited by 304 publications

(222 citation statements)

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“…Each layer consisted of a single anatase TiO 2 nanosheet, and Au nanoparticles about 6 nm in diameter were positioned at crystal steps or edges on the TiO 2 nanosheet. The structure differs significantly from that of conventional core-shell Au/TiO 2 nanospheres (Lee et al, 2011). The layered Au/TiO 2 nanospheres showed catalytic activity and stability for HCHO oxidation at room temperature.…”

Section: Introductionmentioning

confidence: 88%

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Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Pang

et al. 2016

Journal of Environmental Sciences

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We describe here a one-step method for the synthesis of Au/TiO 2 nanosphere materials, which were formed by layered deposition of multiple anatase TiO 2 nanosheets. The Au nanoparticles were stabilized by structural defects in each TiO 2 nanosheet, including crystal steps and edges, thereby fixing the Au-TiO 2 perimeter interface. Reactant transfer occurred along the gaps between these TiO 2 nanosheet layers and in contact with catalytically active sites at the Au-TiO 2 interface. The doped Au induced the formation of oxygen vacancies in the Au-TiO 2 interface. Such vacancies are essential for generating active oxygen species (*O − ) on the TiO 2 surface and Ti 3+ ions in bulk TiO 2 . These ions can then form Ti 3+ -O − -Ti 4+ species, which are known to enhance the catalytic activity of formaldehyde (HCHO) oxidation.These studies on structural and oxygen vacancy defects in Au/TiO 2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials.

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Section: Introductionmentioning

confidence: 88%

“…The synthesis and catalytic performance of yolk-shell spheres containing one or more noble metal nanoparticle core(s) and a mesoporous shell of oxides have been reported (Hampsey et al, 2005;Wang et al, 2011;Lee et al, 2011). Reactants pass through the mesopores of the shell to be activated by the noble metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Pang

et al. 2016

Journal of Environmental Sciences

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“…[6] Template-directed method is usually used to fabricate the TiO 2 nanoparticles with hollow structures, which is demonstrated to be a conceptually simple, straightforward and versatile route. [7][8][9][10] Generally, the process of template-directed strategy includes the following steps: (1) preparing a sacrificial template; (2) forming a coated titanium dioxide shell on the surface of the template by hydrolysis and condensation reaction; (3) removing the template by calcination or etching process to obtain a hollow structure of TiO 2 . Polymeric nanoparticles have great potential in template-directed fabricating of various inorganic hollow nanospheres due to their adjustable morphologies and sizes.…”

Section: Introductionmentioning

confidence: 99%

Template‐Directed Fabrication of Anatase TiO₂ Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange

Chang

Zhang

2017

Chin. J. Chem.

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Polymerization-induced self-assembly (PISA) was used to fabricate polymeric nanoparticles via reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate (BzMA) using diblock copolymer poly(glycerol monomethacrylate)-block-poly(2-dimethylaminoethyl methacrylate) (PGMMA-PDMAEMA-CTA) as the macro RAFT agent. The dispersion of polymeric nanoparticles with a final concentration of about 210 mg/g (solid content of 21%) was obtained via this efficient method (PISA). The resultant polymeric nanoparticles consisting of corona-shell-core three layers with weak polyelectrolyte PDMAEMA as the shell were used as sacrificial template to fabricate TiO 2 hollow nanoparticles. The negatively charged titanium precursor was absorbed into the PDMAEMA shell via the electrostatic interaction, and hydrolyzed to form polymer/TiO 2 hybrid nanoparticles. Anatase TiO 2 hollow nanoparticles were formed after removing the polymeric templates by calcination at 550 ℃. The experiments of photocatalytic degradation of methyl orange showed that the resultant anatase TiO 2 hollow nanoparticles had high photocatalytic activity and good reusability.

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“…In particular, utilization of organic templates such as polymers offers vast opportunities for controlling the shapes of inorganic materials at the micrometer/nanometer scale. Such strategies can be exploited to synthesize shape-defined TiO 2 materials exhibiting nano/micro spheres [9], hollow structures [10], tubes [11], wires [3], core-shell structures [3], and egg-yolk structures [12].…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

Erdogan

Polat

Garifullin

et al. 2014

Applied Surface Science

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a b s t r a c tPolystyrene cross-linked divinyl benzene (PS-co-DVB) microspheres were used as an organic template in order to synthesize photocatalytic TiO 2 microspheres and microbowls. Photocatalytic activity of the microbowl surfaces were demonstrated both in the gas phase via photocatalytic NO(g) oxidation by O 2 (g) as well as in the liquid phase via Rhodamine B degradation. Thermal degradation mechanism of the polymer template and its direct influence on the TiO 2 crystal structure, surface morphology, composition, specific surface area and the gas/liquid phase photocatalytic activity data were discussed in detail. With increasing calcination temperatures, spherical polymer template first undergoes a glass transition, covering the TiO 2 film, followed by the complete decomposition of the organic template to yield TiO 2 exposed microbowl structures. TiO 2 microbowl systems calcined at 600 • C yielded the highest per-site basis photocatalytic activity. Crystallographic and electronic properties of the TiO 2 microsphere surfaces as well as their surface area play a crucial role in their ultimate photocatalytic activity. It was demonstrated that the polymer microsphere templated TiO 2 photocatalysts presented in the current work offer a promising and a versatile synthetic platform for photocatalytic DeNO x applications for air purification technologies.

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A Yolk@Shell Nanoarchitecture for Au/TiO₂ Catalysts

Cited by 304 publications

References 19 publications

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Template‐Directed Fabrication of Anatase TiO₂ Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

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A Yolk@Shell Nanoarchitecture for Au/TiO2 Catalysts

Cited by 304 publications

References 19 publications

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Template‐Directed Fabrication of Anatase TiO2 Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

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Product

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A Yolk@Shell Nanoarchitecture for Au/TiO₂ Catalysts

Template‐Directed Fabrication of Anatase TiO₂ Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange