Structure and valence properties of ceria films synthesized by laser ablation under reducing atmosphere

Péreira, A.; Blouin, M.; Pillonnet, Anne; Guay, Daniel

doi:10.1088/2053-1591/1/1/015704

Cited by 28 publications

(21 citation statements)

References 46 publications

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“…Because the intensity of the smaller component at 531.2 eV was similar after oxidation and reduction, it is attributed to the presence of surface −OH groups rather than to vacancy-related species. 82,85,86 Water (533.1 eV) was removed by heat treatment, and a new component emerged at 530.2 eV. Comparing it with our Rh 3d results, in which after 2 h of heating part of the Rh was oxidized and after oxidation Rh was in the oxidized state completely, we ascribe it to metalbonded O and OH species on the surface of the Rh particles.…”

Section: Resultssupporting

confidence: 56%

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂

et al. 2016

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The effects of reduction by H2 and by heat treatment in vacuum and in O2 flow on Rh particle size changes of Rh/CeO2 samples were studied by X-ray photoelectron spectroscopy (XPS), high-resolution electron microscopy (HRTEM), and CO adsorption followed by diffuse reflectance infrared spectroscopy (DRIFTS). Low-temperature (373-423 K) reduction of Rh without agglomeration is demonstrated. An average particle size of 2.3 ± 1.1 nm was measured by HRTEM regardless of the metal loading (1-5%). On Rh/CeO2, a significant particle size increase of the Rh particles was detected on heating (773 K). In this work, we suggest that the temperature-induced surface decrease resulting from the sintering of Rh is favored only for well-dispersed particles. XP spectra revealed that the mobile oxygens of CeO2 fundamentally determine the oxidation state of the supported metals. At elevated temperature, the oxidation of the reduced support surface as well as the metal component takes place because of the segregation of ceria oxygens. When the aggregated particles were reoxidized, the redispersion of Rh was observed probably because of the formation of Rh-O-Ce bonds.

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Section: Resultssupporting

confidence: 56%

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂

et al. 2016

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“…The review of the O 1s photoelectron regions after the curve fitting ( Figure 12 ) shows that the spectra of the as-prepared catalysts consist of two components, namely, less intense low energy peaks centered between 529.3 and 529.7 eV and more intense higher energy peaks between 531.1 and 531.7 eV ( Table 7 ). The low energy peaks are attributed to lattice oxygen named as O I associated with the NiAl layered structure [ 81 , 85 ] and oxygen in the CeO 2 lattice [ 86 , 87 , 88 ] in 3CeNiAl and Au/3CeNiAl samples. The high energy peaks recognized as surface adsorbed oxygen are named O II .…”

Section: Resultsmentioning

confidence: 99%

“…The high energy peaks recognized as surface adsorbed oxygen are named O II . The intensity of these peaks is significant compared to O I peaks, because they belong to chemisorbed oxygen in CO 3 2− /OH groups from the NiAl hydroxide layer and intercalated water molecules from interlayer space [ 81 , 89 ] and hydroxyl groups of pure CeO 2 [ 86 , 87 , 88 , 90 ]. In addition, the shifting of the O II component toward higher BEs in the Au-containing samples (Au/NiAl and Au/3CeNiAl) suggests a strong interaction of metallic gold with oxygen, producing a decrease in the electronic charge of these oxygen species.…”

Section: Resultsmentioning

confidence: 99%

Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition

et al. 2021

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Supported gold on co-precipitated nanosized NiAl layered double hydroxides (LDHs) was studied as an effective catalyst for medium-temperature water–gas shift (WGS) reaction, an industrial catalytic process traditionally applied for the reduction in the amount of CO in the synthesis gas and production of pure hydrogen. The motivation of the present study was to improve the performance of the Au/NiAl catalyst via modification by CeO2. An innovative approach for the direct deposition of ceria (1, 3 or 5 wt.%) on NiAl-LDH, based on the precipitation of Ce3+ ions with 1M NaOH, was developed. The proposed method allows us to obtain the CeO2 phase and to preserve the NiAl layered structure by avoiding the calcination treatment. The synthesis of Au-containing samples was performed through the deposition–precipitation method. The as-prepared and WGS-tested samples were characterized by X-ray powder diffraction, N2-physisorption and X-ray photoelectron spectroscopy in order to clarify the effects of Au and CeO2 loading on the structure, phase composition, textural and electronic properties and activity of the catalysts. The reduction behavior of the studied samples was evaluated by temperature-programmed reduction. The WGS performance of Au/NiAl catalysts was significantly affected by the addition of CeO2. A favorable role of ceria was revealed by comparison of CO conversion degree at 220 °C reached by 3 wt.% CeO2-modified and ceria-free Au/NiAl samples (98.8 and 83.4%, respectively). It can be stated that tuning the properties of Au/NiAl LDH via CeO2 addition offers catalysts with possibilities for practical application owing to innovative synthesis and improved WGS performance.

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“…Figure 8B shows the O1s spectra of the Ag/CeO 2 /SBA-15 materials. It can be deconvoluted into two parts with peak maxima at 533.5 and 532.8 eV, which are assigned to oxygen in surface OH species and lattice O 2in CeO 2 or SBA-15, respectively (Pereira, Blouin, Pillonnet, & Guay, 2014). The latter was not further deconvoluted and separated.…”

Section: Plasmonmentioning

confidence: 99%

Ag/CeO2/SBA-15 hybrid catalysts for the elimination of E. coli in potable water system

Arellano

Wang

Balcázar

et al. 2020

JART

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Hybrid Ag/CeO2/SBA-15 mesoporous nanocatalysts were prepared and their bactericidal activity was evaluated aiming at elimination of Escherichia coli (E. coli) in the potable water system. It was found that there existed electrons transferring from Ag0 to CeO2 to form Ag+/Ag0 and Ce4+/Ce3+ couples in the heterojunction structure, which resulted from strong interaction between Ag nanoparticles (AgNPs) and highly dispersed CeO2. By increasing the Ag content from 1wt% to 3 and 5 wt% in the catalysts, the bactericidal power of Ag/CeO2/SBA-15 materials significantly enhanced in the presence of both visible and UV light, which can be explained by the increasing electrons transferring function from Ag0 to CeO2 under UV-visible light irradiation. A combination mechanism of E. coli deactivation was proposed where E. coli body may be simultaneously attacked by both AgNPs and Ag+ ions promoted by CeO2. The former may attack the cell membrane, leading to its cleavage and disruption; and the latter may be ionized and released from AgNPs to enter inside the cell, modifying its permeability and respiration, finally resulting in complete deactivation and death.

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Structure and valence properties of ceria films synthesized by laser ablation under reducing atmosphere

Cited by 28 publications

References 46 publications

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂

Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition

Ag/CeO2/SBA-15 hybrid catalysts for the elimination of E. coli in potable water system

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Structure and valence properties of ceria films synthesized by laser ablation under reducing atmosphere

Cited by 28 publications

References 46 publications

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO2

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO2

Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition

Ag/CeO2/SBA-15 hybrid catalysts for the elimination of E. coli in potable water system

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Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂

Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO₂