Facet-dependent activity of shape-controlled TiO<sub>2</sub> supported Au nanoparticles for the water–gas shift reaction

Tang, Yunge; Chen, Yongjie; Liu, Xiao; Wang, Chengxiong; Zhao, Yaohua; Chen, Rong; Shan, Bin

doi:10.1039/d1cy01823j

Cited by 4 publications

(3 citation statements)

References 48 publications

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“…Flytzani-Stephanopoulos and a co-worker 15 found that the CeO 2 -morphology-dependent oxygen vacancy concentrations determined the number of strongly bound Au atoms and consequently the catalytic activity in the WGS reaction. Tang et al 16 observed TiO 2 -morphology-dependent catalytic activity of Au/TiO 2 catalysts in the WGS reaction, which was associated with TiO 2 shape-dependent reducibility and intermediate decomposition. As far as we know, oxide shape effects have not been explored on Pt/oxide catalysts for the WGS reaction, although they are widely used.…”

Section: Introductionmentioning

confidence: 99%

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction

Zhang

Jia

et al. 2022

ACS Catal.

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The bifunctional role of the noble-metal−oxide interface in activating reactants is important for efficient heterogeneous catalysis of the water-gas shift (WGS) reaction. Herein, we report that the morphology of the TiO 2 support strongly affects the Pt−TiO 2 interfacial catalysis for the WGS reaction using Pt nanoparticles of similar sizes supported on anatase TiO 2 nanocrystals with various morphologies predominantly exposing {001} facets (denoted TiO 2 {001}), {100} facets (denoted TiO 2 {100}), and {101} facets (denoted TiO 2 {101}). CO conversions follow the order Pt/TiO 2 {100} ≈ Pt/TiO 2 {101} > Pt/ TiO 2 {001}, but the apparent activation energies are similar for Pt/TiO 2 {100}, Pt/TiO 2 {101}, and Pt/TiO 2 {001} catalysts. Characterization results show that the Pt/TiO 2 {001} catalyst exhibits fewer surface oxygen vacancies and consequently active Pt−O v,TiOd 2 interfacial ensemble sites than Pt/TiO 2 {100} and Pt/TiO 2 {101} catalysts. This can be attributed to the fact that oxygen vacancies are more stable in the bulk of TiO 2 {001} than on the surface but are more stable on the surface of TiO 2 {100} and TiO 2 {101} than in the bulk and to the fact that carbonate and bicarbonate spectators accumulate at the Pt−TiO 2 interface at the Pt/TiO 2 {001} catalyst but barely accumulate the at Pt/TiO 2 {100} and Pt/TiO 2 {101} catalysts. Both lead to the poorer catalytic activity of Pt/TiO 2 {001} catalyst for catalyzing the WGS reaction. These results provide insights into a fundamental understanding of the activity−structure relation of Pt/TiO 2 catalysts for the WGS reaction.

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Section: Introductionmentioning

confidence: 99%

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction

Zhang

Jia

et al. 2022

ACS Catal.

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“…The deposition and formation mechanisms of Au NPs depend on the morphology, crystal structure, and crystal phase composition of the semiconductor [36][37][38][39]. Due to the non-covalent interaction between TiO2 and Au NPs, the deposition of Au NPs is favored on the anatase crystal phase [40,41].…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…Commercial TiO2′s anatase diffractions are located at 25.2° and 37.8°, whereas in the case of the Au/TiO2/WO3 heterostructures, these peaks are situated at 25.4° and 37.1°; thus, the slight shifts in the anatase peaks could be linked to the presence of Au NPs on anatase TiO2. The probability that Au NPs are deposited on anatase TiO2 is extremely high since the crystal phase composition of commercial TiO2 is The deposition and formation mechanisms of Au NPs depend on the morphology, crystal structure, and crystal phase composition of the semiconductor [36][37][38][39]. Due to the non-covalent interaction between TiO 2 and Au NPs, the deposition of Au NPs is favored on the anatase crystal phase [40,41].…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Tungsten Oxide Morphology-Dependent Au/TiO2/WO3 Heterostructures with Applications in Heterogenous Photocatalysis and Surface-Enhanced Raman Spectroscopy

Székely¹,

Kovács

Rusu

et al. 2023

Catalysts

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Developing highly efficient Au/TiO2/WO3 heterostructures with applications in heterogeneous photocatalysis (photocatalytic degradation) and surface-enhanced Raman spectroscopy (dye detection) is currently of paramount significance. Au/TiO2/WO3 heterostructures were obtained via heat or time-assisted synthesis routes developed by slightly modifying the Turkevich–Frens synthesis methods and were investigated by TEM, SEM, XRD, Raman spectroscopy, XPS, photoluminescence, and UV–vis DRS techniques. Structural features, such as WO3 crystalline phases, TiO2 surface defects, as well as the WO3 (220) to TiO2-A (101) ratio, were the key parameters needed to obtain heterostructures with enhanced photocatalytic activity for removing oxalic acid, phenol, methyl orange, and aspirin. Photodegradation efficiencies of 95.9 and 96.9% for oxalic acid; above 96% (except one composite) for phenol; 90.1 and 97.9% for methyl orange; and 81.6 and 82.1% for aspirin were obtained. By employing the SERS technique, the detection limit of crystal violet dye, depending on the heterostructure, was found to be between 10−7–10−8 M. The most promising composite was Au/TiO2/WO3-HW-TA it yielded conversion rates of 82.1, 95.9 and 96.8% for aspirin, oxalic acid, and phenol, respectively, and its detection limit for crystal violet was 10−8 M. Au/TiO2/WO3-NWH-HA achieved 90.1, 96.6 and 99.0% degradation efficiency for methyl orange, oxalic acid, and phenol, respectively, whereas its limit of detection was 10−7 M. The Au/TiO2/WO3 heterojunctions exhibited excellent stability as SERS substrates, yielding strong-intensity Raman signals of the pollutant molecules even after a long period of time.

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Study of ceria-doped Au/TiO2 catalysts for boosting hydrogen production by water-gas shift reaction

Tabakova,

Nikolova,

Ivanov

et al. 2024

International Journal of Hydrogen Energy

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Facet-dependent activity of shape-controlled TiO₂ supported Au nanoparticles for the water–gas shift reaction

Abstract: The bifunctional role of noble metal/oxide interface in the activation of reactants is of vital importance in heterogeneous catalysis of water-gas shift (WGS) reaction. Herein, three types of shape-controlled TiO2...

Cited by 4 publications

References 48 publications

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction

Tungsten Oxide Morphology-Dependent Au/TiO2/WO3 Heterostructures with Applications in Heterogenous Photocatalysis and Surface-Enhanced Raman Spectroscopy

Study of ceria-doped Au/TiO2 catalysts for boosting hydrogen production by water-gas shift reaction

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Facet-dependent activity of shape-controlled TiO2 supported Au nanoparticles for the water–gas shift reaction

Abstract: The bifunctional role of noble metal/oxide interface in the activation of reactants is of vital importance in heterogeneous catalysis of water-gas shift (WGS) reaction. Herein, three types of shape-controlled TiO2...

Cited by 4 publications

References 48 publications

Titania-Morphology-Dependent Pt–TiO2 Interfacial Catalysis in Water-Gas Shift Reaction

Titania-Morphology-Dependent Pt–TiO2 Interfacial Catalysis in Water-Gas Shift Reaction

Tungsten Oxide Morphology-Dependent Au/TiO2/WO3 Heterostructures with Applications in Heterogenous Photocatalysis and Surface-Enhanced Raman Spectroscopy

Study of ceria-doped Au/TiO2 catalysts for boosting hydrogen production by water-gas shift reaction

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Facet-dependent activity of shape-controlled TiO₂ supported Au nanoparticles for the water–gas shift reaction

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction

Titania-Morphology-Dependent Pt–TiO₂ Interfacial Catalysis in Water-Gas Shift Reaction