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dc.contributor.author
Fuentes, Rodolfo Oscar
dc.contributor.author
Acuña, Leandro Marcelo
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Albornoz, Cecilia Andrea
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Leyva, A. G.
dc.contributor.author
Sousa, N.
dc.contributor.author
Figueiredo, F. M.
dc.date.available
2018-05-04T21:22:29Z
dc.date.issued
2016-07
dc.identifier.citation
Fuentes, Rodolfo Oscar; Acuña, Leandro Marcelo; Albornoz, Cecilia Andrea; Leyva, A. G.; Sousa, N.; et al.; Structural, physical and chemical properties of nanostructured nickel-substituted ceria oxides under reducing and oxidizing conditions; Royal Society of Chemistry; RSC Advances; 6; 69; 7-2016; 64861-64870
dc.identifier.issn
2046-2069
dc.identifier.uri
http://hdl.handle.net/11336/44244
dc.description.abstract
This work reports the synthesis of nanostructured Ce1-xNixO2-δ (x = 0.05, 0.1, 0.15 and 0.2) oxides prepared by cation complexation route and with the main objective of studying their redox properties using a combination of electron microscopy, synchrotron radiation X-ray diffraction (SR-XRD) and X-ray absorption near-edge spectroscopy (XANES). The Ce1-xNixO2-δ series of nanopowders maintain the cubic crystal structure (Fm3m space group) of pure ceria, with an average crystallite size of 5-7 nm indicated by XRD patterns and confirmed by transmission electron microscopy. In situ SR-XRD and XANES carried out under reducing (5% H2/He; 5% CO/He) and oxidizing (21%O2/N2) atmospheres at temperatures up to 500 °C show a Ni solubility limit close to 15 at.% in air at room temperature, decreasing to about 10 at.% after exposure to 5% H2/He atmosphere at 500 °C. At room temperature in air, the effect of Ni on the lattice parameter of Ce1-xNixO2-δ is negligible, whereas a marked expansion of the lattice is observed at 500 °C in reducing conditions. This is shown by XANES to be correlated with the reduction of up to 25% of Ce4+ cations to the much larger Ce3+, possibly accompanied by the formation of oxygen vacancies. The redox ability of the Ce4+/Ce3+ couple in nanocrystalline Ni-doped ceria is greatly enhanced in comparison to pure ceria or achieved by using other dopants (e.g. Gd, Tb or Pr), where it is limited to less than 5% of Ce cations.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Royal Society of Chemistry
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Nickel-Substituted Ceria
dc.subject
Nanostructured
dc.subject
Xanes
dc.subject.classification
Recubrimientos y Películas
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Ingeniería de los Materiales
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INGENIERÍAS Y TECNOLOGÍAS
dc.title
Structural, physical and chemical properties of nanostructured nickel-substituted ceria oxides under reducing and oxidizing conditions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-04T14:56:23Z
dc.journal.volume
6
dc.journal.number
69
dc.journal.pagination
64861-64870
dc.journal.pais
Reino Unido
dc.description.fil
Fil: Fuentes, Rodolfo Oscar. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Acuña, Leandro Marcelo. Ministerio de Defensa. Instituto de Investigaciones Científicas y Técnicas para la Defensa; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Albornoz, Cecilia Andrea. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
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Fil: Leyva, A. G.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina
dc.description.fil
Fil: Sousa, N.. University of Aveiro; Portugal
dc.description.fil
Fil: Figueiredo, F. M.. University of Aveiro; Portugal
dc.journal.title
RSC Advances
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1039/C6RA14853K
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C6RA14853K
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