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http://hdl.handle.net/10773/19688
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Campo DC | Valor | Idioma |
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dc.contributor.author | Monteiro, J. F. | pt |
dc.contributor.author | Waerenborgh, J. C. | pt |
dc.contributor.author | Kovalevsky, A. V. | pt |
dc.contributor.author | Yaremchenko, A. A. | pt |
dc.contributor.author | Frade, J. R. | pt |
dc.date.accessioned | 2017-12-07T19:21:33Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0022-4596 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19688 | - |
dc.description.abstract | Potassium-substituted SrFeO3-delta for possible application as oxygen evolution electrode in alkaline or molten salt media was prepared by mechanical activation and characterized by X-ray diffraction, dilatometric and thermogravimetric analysis, Mossbauer spectroscopy, and electrical conductivity measurements. Room temperature mechanical activation of a mixture of oxide precursors with subsequent thermal treatments at 700-900 degrees C results in the formation of Sr(0.9)Ka(0.1)FeO(3-delta) with tetragonal perovskite-like structure. Such allows to decrease the synthesis temperature, if compared to the conventional solid-state route, and to prevent possible volatilization of potassium. The results of Mossbauer spectroscopy studies indicate that the oxygen nonstoichiometry in the samples annealed in air at 900-1100 degrees C with subsequent rapid cooling vary in the range delta=0.30-0.32. The electrical conductivity in air exhibits a metal-like behaviour at temperatures above 400 degrees C and semiconductor behaviour in the low-temperature range, reaching 13-30 S/cm under prospective operation conditions for alkaline electrolyzers (<= 90 degrees C). (C) 2012 Elsevier Inc. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F68290%2F2010/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | OXIDE FUEL-CELLS | pt |
dc.subject | OXYGEN STOICHIOMETRY | pt |
dc.subject | CATHODE MATERIALS | pt |
dc.subject | SRFEO3-DELTA | pt |
dc.subject | CONDUCTIVITY | pt |
dc.subject | PEROVSKITES | pt |
dc.subject | PERMEATION | pt |
dc.subject | STABILITY | pt |
dc.subject | CERAMICS | pt |
dc.subject | SIZE | pt |
dc.title | Synthesis of Sr0.9K0.1FeO3-delta electrocatalysts by mechanical activation | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 169 | pt |
degois.publication.lastPage | 175 | pt |
degois.publication.title | JOURNAL OF SOLID STATE CHEMISTRY | pt |
degois.publication.volume | 198 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.jssc.2012.10.009 | pt |
dc.identifier.doi | 10.1016/j.jssc.2012.10.009 | pt |
Aparece nas coleções: | CICECO - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Synthesis of Sr0.9K0.1FeO3-δ electrocatalysts by mechanical activation_10.1016j.jssc.2012.10.009.pdf | 627.61 kB | Adobe PDF |
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