Tuning the oxygen vacancy population of cerium oxide (CeO2−x, 0 &lt;x&lt;0.5) nanoparticles

Mea, Guilherme B. Della; Matte, Lívia P.; Thill, Alisson S.; Lobato, Francielli O.; Benvenutti, Edílson V.; Arenas, Leliz Ticona; Jürgensen, Astrid; Hergenröder, Roland; Poletto, Fernanda; Bernardi, Fabiano

doi:10.1016/j.apsusc.2017.06.101

Cited by 90 publications

(79 citation statements)

References 43 publications

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“…The results attest to the substitution of Ca 2+ with cerium in the HAp lattice during synthesis. The ease of substitution could be assigned to the ionic radii of cerium (0.114 nm for Ce 3+ and 0.097 nm for Ce 4+ ) that are comparable with ionic radius of Ca 2+ (0.106 nm) [46,47]. The XRD results are in agreement with TEM investigation.…”

Section: Resultssupporting

confidence: 75%

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

et al. 2021

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In this study, the cerium-doped hydroxyapatite (Ca10−xCex(PO4)6(OH)2 with xCe = 0.1, 10Ce-HAp) coatings obtained by the spin coating method were presented for the first time. The stability of the 10Ce-HAp suspension particles used in the preparation of coatings was evaluated by ultrasonic studies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The surface morphology of the 10Ce-HAp coating was studied by SEM and atomic force microscopy (AFM) techniques. The obtained 10Ce-HAp coatings were uniform and without cracks or unevenness. Glow discharge optical emission spectroscopy (GDOES) and X-ray photoelectron spectroscopy (XPS) were used for the investigation of fine chemical depth profiling. The antifungal properties of the HAp and 10Ce-HAp suspensions and coatings were assessed using Candida albicans ATCC 10231 (C. albicans) fungal strain. The quantitative antifungal assays demonstrated that both 10Ce-HAp suspensions and coatings exhibited strong antifungal properties and that they successfully inhibited the development and adherence of C. albicans fungal cells for all the tested time intervals. The scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) visualization of the C. albicans fungal cells adherence to the 10Ce-HAp surface also demonstrated their strong inhibitory effects. In addition, the qualitative assays also suggested that the 10Ce-HAp coatings successfully stopped the biofilm formation.

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Section: Resultssupporting

confidence: 75%

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

et al. 2021

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“…Della Mea et al studied the redox properties of differently prepared ceria nanoparticles exposed to 1 mbar CO reducing atmosphere and high temperature [121]. Their aim was to tune the oxygen vacancy population in order to design a rational and optimal ceria catalyst for CO oxidation.…”

Section: Fundamental Studiesmentioning

confidence: 99%

“…It is worth mentioning that the bimetallic catalyst was studied by NAP-XPS under 1 mbar H 2 reducing atmosphere instead of CO (also a reducing agent) due to the possible formation of volatile Ni carbonyl species that could contaminate the analysis chamber. As already mentioned above, Della Mea and co-workers [121] also studied differently prepared ceria catalysts, altering their oxygen vacancy population, in order to design a rational ceria catalyst for CO oxidation. In this case, NAP-XPS conditions were 1 mbar of CO gas phase and temperatures from 373 to 773 K. Finally, another alternative to non-noble metals for PROX catalysts is the use of transition metal oxides, such as copper and cobalt-based catalysts, which show potential for this reaction [179][180][181][182][183][184].…”

Section: Co Oxidation and Preferential Co Oxidation (Prox)mentioning

confidence: 99%

Ceria-Based Catalysts Studied by Near Ambient Pressure X-ray Photoelectron Spectroscopy: A Review

et al. 2020

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The development of better catalysts is a passionate topic at the forefront of modern science, where operando techniques are necessary to identify the nature of the active sites. The surface of a solid catalyst is dynamic and dependent on the reaction environment and, therefore, the catalytic active sites may only be formed under specific reaction conditions and may not be stable either in air or under high vacuum conditions. The identification of the active sites and the understanding of their behaviour are essential information towards a rational catalyst design. One of the most powerful operando techniques for the study of active sites is near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), which is particularly sensitive to the surface and sub-surface of solids. Here we review the use of NAP-XPS for the study of ceria-based catalysts, widely used in a large number of industrial processes due to their excellent oxygen storage capacity and well-established redox properties.

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“…[ 47 ] Bernardi's group prepared defect‐controllable CeO 2 through thermal treatment under a CO atmosphere. [ 48 ] Combining the near ambient pressure X‐ray photoelectron spectroscopy (NAP‐XPS) technique with the in situ XAS technique, it was found that Ce (III) fraction values as high as 0.92 were achieved at relatively low temperatures. Namely, a higher concentration of oxygen vacancies in CeO 2 is obtained, which is efficient for the CO oxidation reaction ( Figure a).…”

Section: Strategies For Introducing Defectsmentioning

confidence: 99%

“…a–c) Reproduced with permission. [ 48 ] Copyright 2017, Elsevier. d) Possible mechanism of charge separation and production of oxidation groups over CeO 2 /ZnO photocatalyst under visible light irradiation.…”

Section: Strategies For Introducing Defectsmentioning

confidence: 99%

Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications

et al. 2021

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With abundant crystal defects, cerium oxide (CeO2), widely used in heterogeneous catalysis, has attracted extensive attention. In recent years, researchers have investigated that the defect chemistry of CeO2 plays a vital role in its catalytic activity and have developed various defect introduction methods to synthesize stable and efficient defective CeO2‐based catalysts. Herein, the understanding, introduction, and applications of defect chemistry in CeO2‐based heterogeneous catalysis are reviewed, and the structure–activity relationship between defect engineering and catalytic performance is recommended with great emphasis. Interests are put into the investigation of how defects influence the activity and stability of defective CeO2 catalysts and effective strategies for fabricating efficient, stable, and defective CeO2 catalysts. Finally, the existing problems and perspectives of CeO2 defect chemistry for heterogeneous catalysis are displayed. This review provides a reference for in‐depth understanding and the design of more efficient CeO2‐based catalysts for heterogeneous catalysis.

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Tuning the oxygen vacancy population of cerium oxide (CeO2−x, 0 <x<0.5) nanoparticles

Cited by 90 publications

References 43 publications

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Ceria-Based Catalysts Studied by Near Ambient Pressure X-ray Photoelectron Spectroscopy: A Review

Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications

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Tuning the oxygen vacancy population of cerium oxide (CeO2−x, 0 <x<0.5) nanoparticles

Cited by 90 publications

References 43 publications

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Ceria-Based Catalysts Studied by Near Ambient Pressure X-ray Photoelectron Spectroscopy: A Review

Defect Engineering on CeO2‐Based Catalysts for Heterogeneous Catalytic Applications

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Product

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Defect Engineering on CeO₂‐Based Catalysts for Heterogeneous Catalytic Applications