Ceria-based ceramic composites for high temperature thermochemical applications

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dc.contributor.authorSILVA, PAULO M.pt_BR
dc.contributor.authorESPOSITO, VINCENZOpt_BR
dc.contributor.authorMARANI, DEBORApt_BR
dc.contributor.authorFLORIO, DANIEL Z. dept_BR
dc.contributor.authorFONSECA, FABIO C.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoBRAZILIAN MRS MEETING, 17thpt_BR
dc.date.accessioned2019-11-26T18:20:37Z
dc.date.available2019-11-26T18:20:37Z
dc.date.eventoSeptember 16-20, 2018pt_BR
dc.description.abstractAmong thermochemical conversion processes, the production of fuels such as H2 via solar thermochemical cycles is potentially more efficient and more economical than the use of electric energy to electrolyze water. The principle of solar thermochemical cycles is based on the remarkable properties of some oxides, which can be reduced and oxidized cyclically (redox cycles), i.e., releasing and absorbing oxygen under certain temperature (or pressure) regimes. These redox cycles can be efficiently used to convert H2O (or CO2) to H2 (CO). Thermochemical redox cycles avoid the problematic step of fuel / O2 separation and allow operation at more moderate temperatures (~ 1500 K) [1]. In this work, a new material concept for the separation of high temperature H2O based on porous ceramic composites composed of an ultra-high temperature ceramic phase (UHTC) and doped cerium oxide is proposed. UHTC usually exhibit extremely low mass diffusion rates and excellent thermomechanical properties for high temperature applications [2]. Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 10-12 atm) and high temperatures (T > 800 °C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3[3]. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air and reducing condition, focusing on densification, viscosity and the evolution of the microstructure. The redox process of CGO/Al2O3 is investigated using dilatometry, microscopy, and electrochemical impedance spectroscopy. The preliminary results evidenced that new phases with remarkable microstructure can be obtained at reducing atmosphere depending on the temperature of reoxidation during coolingpt_BR
dc.format.extent989-989pt_BR
dc.identifier.citationSILVA, PAULO M.; ESPOSITO, VINCENZO; MARANI, DEBORA; FLORIO, DANIEL Z. de; FONSECA, FABIO C. Ceria-based ceramic composites for high temperature thermochemical applications. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. <b>Abstract...</b> São Carlos: Aptor Software, 2018. p. 989-989. Disponível em: http://repositorio.ipen.br/handle/123456789/30333.
dc.identifier.orcid0000-0003-0708-2021pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0708-2021
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/30333
dc.localSão Carlospt_BR
dc.local.eventoNatal, RNpt_BR
dc.publisherAptor Softwarept_BR
dc.rightsopenAccesspt_BR
dc.titleCeria-based ceramic composites for high temperature thermochemical applicationspt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorFABIO CORAL FONSECA
ipen.autorPAULO SERGIO MARTINS DA SILVA
ipen.codigoautor943
ipen.codigoautor11424
ipen.contributor.ipenauthorFABIO CORAL FONSECA
ipen.contributor.ipenauthorPAULO SERGIO MARTINS DA SILVA
ipen.date.recebimento19-11
ipen.event.datapadronizada2018pt_BR
ipen.identifier.ipendoc26122pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
relation.isAuthorOfPublicationaa9a4b52-270e-4ea4-a566-a1107da1e0cf
relation.isAuthorOfPublication5c6d762b-7c33-450a-b32a-3b4537a961d7
relation.isAuthorOfPublication.latestForDiscovery5c6d762b-7c33-450a-b32a-3b4537a961d7
sigepi.autor.atividadeFONSECA, FABIO C.:943:610:Npt_BR
sigepi.autor.atividadeSILVA, PAULO M.:11424:610:Spt_BR
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