Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19929
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dc.contributor.authorLoureiro, Francisco J. A.pt
dc.contributor.authorRajesh, Surendranpt
dc.contributor.authorFigueiredo, Filipe M. L.pt
dc.contributor.authorMarques, Fernando M. B.pt
dc.date.accessioned2017-12-07T19:29:42Z-
dc.date.available2017-12-07T19:29:42Z-
dc.date.issued2014pt
dc.identifier.issn2046-2069pt
dc.identifier.urihttp://hdl.handle.net/10773/19929-
dc.description.abstractSolid oxide-alkaline carbonate (Li2CO3 : Na2CO3, 1 : 1 molar ratio) composite electrolytes were prepared using different solid oxide matrices (TiO2, HfO2, Yb2O3, Y2O3, Dy2O3, Gd2O3 and La2O3), to cover a wide range of ceramic chemical characteristics. The chemical and microstructural stability of these oxides with the mixed carbonates were studied by powder X-ray diffraction, scanning electron microscopy, infrared and laser Raman spectroscopic techniques after reacting them at 690 degrees C for 1 h in air. The electrical performance of selected composites was evaluated using impedance spectroscopy, in air. Amongst the oxides hereby tested, TiO2 is found to be the most unstable in contact with the molten carbonates whereas Yb2O3 is quite stable. The corresponding composites have ionic conductivities (3.3 x 10(-1) S cm(-1) at 580 degrees C, in air) close to those reported for state-of-the-art ceria-based composite electrolytes. A draft equivalent circuit model underlines the transport in the carbonate phase and across the carbonate/oxide interfaces as the dominant contributions to the total conductivity of these composites. Yb2O3 + Li2CO3 : Na2CO3 composites show chemical stability at operating temperatures in the order of 690 degrees C, standing as a potential candidate for intermediate temperature applications.pt
dc.language.isoengpt
dc.publisherROYAL SOC CHEMISTRYpt
dc.relationinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/137242/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/COMPETE/132936/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F76228%2F2011/PTpt
dc.rightsopenAccesspor
dc.subjectCO2 SEPARATION MEMBRANESpt
dc.subjectCERAMIC FUEL-CELLSpt
dc.subjectELECTRICAL-CONDUCTIVITYpt
dc.subjectALKALI CARBONATESpt
dc.subjectIONIC-CONDUCTIONpt
dc.subjectDOPED CERIApt
dc.subjectRE2O3 REpt
dc.subjectTEMPERATUREpt
dc.subjectRAMANpt
dc.subjectMIXTURESpt
dc.titleStability of metal oxides against Li/Na carbonates in composite electrolytespt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.firstPage59943pt
degois.publication.issue104pt
degois.publication.lastPage59952pt
degois.publication.titleRSC ADVANCESpt
degois.publication.volume4pt
dc.relation.publisherversion10.1039/c4ra11446apt
dc.identifier.doi10.1039/c4ra11446apt
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