Structural and Chemical Characterization of Cerium Oxide Thin Layers Grown on Silicon Substrate

Potin, Valérie; Lavková, Jaroslava; Bourgeois, S.; Dubau, Martin; Matolı́nová, Iva; Matolín, Vladimı́r

doi:10.1016/j.matpr.2015.04.014

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…1) and combined with the photoemission analysis of the electronic structure of the oxide surface. The polycrystalline film had a grain size between 10 and 30 nm, measured by both AFM and SEM, in agreement with the published data on similar continuous compact polycrystalline CeO2 films prepared by magnetron sputtering [27][28][29]. The surface roughness was about 1.20 nm.…”

Section: Ceo2/gc Cathode Characterization By Afm Sem Xps and Rpessupporting

confidence: 89%

“…The RPES analysis shows that immersion in PBS and CV cycling further reduce the electrode surface. Once the hydrogen peroxide is introduced into the working solution under applied Catalyst Km, mM Reference RF CeO2/GC 1.02 This paper CeO2 NPs 64.60 [28] CeO2/NT-TiO2 0.04 [29] H2TCPP-CeO2 NPs 0.254 [30] CeO2 NPs 0.278 [30] LaNiO3 90.05 [31] Au/CeO2-chitosan composite film 1.93 [32] Fe3O4 154 [33] HRP 3.70 [33,34] This item was downloaded from IRIS Università di Bologna (https://cris.unibo.it/)…”

Section: Discussionmentioning

confidence: 99%

“…The partial reduction of the CeO2/GC electrode was associated with the polycrystalline structure of the oxide (mainly due to oxygen vacancies on the crystallites surface [28,29]) and with the presence of a small amount of fluorine on the surface of the film (the usual contamination element for commercially available cerium or cerium oxide). As the ceria film was stored in air and analysed in UHV without cleaning, the adventitious carbon and fluorine were detected on the surface roughly in the ratio 1.7 to 1 (Table 1).…”

Section: When Citing Please Refer To the Published Versionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical activity of the polycrystalline cerium oxide films for hydrogen peroxide detection

Kosto

Zanut

Franchi

et al. 2019

Applied Surface Science

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Section: Ceo2/gc Cathode Characterization By Afm Sem Xps and Rpessupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: When Citing Please Refer To the Published Versionmentioning

confidence: 99%

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Electrochemical activity of the polycrystalline cerium oxide films for hydrogen peroxide detection

Kosto

Zanut

Franchi

et al. 2019

Applied Surface Science

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“…The structure of the Pt-CeO 2 films is identical to the structure of bare CeO 2 films and does not depend on the choice of the preparation technique. For instance, nanoparticles of CeO 2 and Pt-CeO 2 terminated predominantly by the {111} and {100} facets have been identified in films prepared by magnetron sputtering, 56,64 chemical vapor deposition, 60 and pulsed laser deposition. 57 It follows that with respect to the nature of Pt 2+ surface species, either the {111} or {100} facets or edge and step sites connecting these facets provide the adsorption sites that anchor atomically dispersed Pt atoms.…”

Section: Parameters Controlling Proton Exchange Membrane Fuel Cell Pementioning

confidence: 99%

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Lykhach

Bruix

Fabris

et al. 2017

Catal. Sci. Technol.

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The concept of single atom catalysis offers maximum noble metal efficiency for the development of lowcost catalytic materials. Among possible applications are catalytic materials for proton exchange membrane fuel cells. In the present review, recent efforts towards the fabrication of single atom catalysts on nanostructured ceria and their reactivity are discussed in the prospect of their employment as anode catalysts.The remarkable performance and the durability of the ceria-based anode catalysts with ultra-low Pt loading result from the interplay between two states associated with supported atomically dispersed Pt and subnanometer Pt particles. The occurrence of these two states is a consequence of strong interactions between Pt and nanostructured ceria that yield atomically dispersed species under oxidizing conditions and sub-nanometer Pt particles under reducing conditions. The square-planar arrangement of four O atoms on {100} nanoterraces has been identified as the key structural element on the surface of the nanostructured ceria where Pt is anchored in the form of Pt 2+ species. The conversion of Pt 2+ species to subnanometer Pt particles is triggered by a redox process involving Ce 3+ centers. The latter emerge due to either oxygen vacancies or adsorption of reducing agents. The unique properties of the sub-nanometer Pt particles arise from metal-support interactions involving charge transfer, structural flexibility, and spillover phenomena. The abundance of specific adsorption sites similar to those on {100} nanoterraces determines the ideal (maximum) Pt loading in Pt-CeO x films that still allows reversible switching between the atomically dispersed Pt and sub-nanometer particles yielding high activity and durability during fuel cell operation.

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“…These nanostructured compact ceria films (20 nm thick) were prepared ex situ by nonreactive magnetron sputtering of a CeO 2 target (99.99%, Kurt J. Lesker). 27 The sputtering was carried out in an Ar atmosphere at total pressure of 4 × 10 −3 mbar with RF power of 80 W giving a growth rate of 1 nm/min. The films were deposited onto a single-crystalline Si(100) wafer covered by a 3 nm thick natural oxide film.…”

Section: Methodsmentioning

confidence: 99%

Thermally Controlled Bonding of Adenine to Cerium Oxide: Effect of Substrate Stoichiometry, Morphology, Composition, and Molecular Deposition Technique

et al. 2017

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The adsorption of adenine, one of the structural units of DNA and RNA, on nanostructured cerium oxide was studied using synchrotron radiation based techniques: photoelectron and X-ray absorption spectroscopies. Using a systematic approach, we studied this biomolecule's bonding to the inorganic surface and examined the effects of different stoichiometry, morphology and composition of cerium oxide films, as well as two methods of molecular deposition (evaporation in vacuum and deposition from aqueous solution). The adenine molecule chemisorbs on the stoichiometric (IV) cerium oxide intact via nitrogen atoms, independent of the oxide morphology and deposition technique. Annealing of the adenine adlayer at 250 °C causes CeO 2 surface partial reduction, along with the partial deprotonation of the nitrogen. The reaction of adenine with ex situ prepared CeO 2 films (nanostructured compact and porous) activates Ce 4+ cation reduction not only on the surface but also in the subsurface layers accompanied by water desorption. The adenine molecule was found to oxidize and decompose on a reduced surface of the cerium oxide, and for a higher degree of oxide reduction, the temperature of decomposition is lower. The concentration of oxygen vacancies on the surface determines the degree of adenine stability on cerium oxide.

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Structural and Chemical Characterization of Cerium Oxide Thin Layers Grown on Silicon Substrate

Cited by 5 publications

References 27 publications

Electrochemical activity of the polycrystalline cerium oxide films for hydrogen peroxide detection

Electrochemical activity of the polycrystalline cerium oxide films for hydrogen peroxide detection

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Thermally Controlled Bonding of Adenine to Cerium Oxide: Effect of Substrate Stoichiometry, Morphology, Composition, and Molecular Deposition Technique

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