Made available in DSpace on 2014-06-11T19:31:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-04-23Bitstream added on 2014-06-13T18:41:35Z : No. of bitstreams: 1 domingues_s_dr_bauru_prot.pdf: 3657467 bytes, checksum: 76e7046498caea5b3afd0c62aff5a187 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / O objetivo deste trabalho foi preparar, pelo método dos precursores poliméricos, condutores mistos (eletrônico e iônico) de 'Ti IND. x''('Sm IND. 0,2''Ce IND. 0,8') IND. (1-x)''O IND. (2-Б) e estudar o efeito da adição de um íon homovalente (titânio) na propriedade estrutural e elétrica do óxido de cério dopado com samário, visando a sua aplicação como anodo em células a combustível (SOFC) que opera em temperaturas reduzidas. A adição do titânio se deu mantendo a substituição do cério por samário (íon aliovalente) à 20% em mol, constituindo o sistema 'Ti IND. x''('Sm IND. 0,2''Ce IND. 0,8') IND. (1-x)''O IND. (2-Б), na tentativa de prover condutividade eletrônica sem degradar a iônica. A caracterização física dos materiais obtidos foi feita por: análises térmicas (TG/DSC), difratometria de raios X (DRX) com refinamento estrutural pelo método de Rietveld, análise textural por adsorção de nitrogênio a 77K (BET), microscopia eletrônica de varredura (MEV), análise elementar semi-quantitativa por energia dispersiva de raios X (EDX) e espectroscopia de impedância (caracterização elétrica). A análise termogravimétrica mostrou que temperaturas próximas à 700ºC é suficiente para que o material estivesse praticamente livre de orgânicos. A difratometria de raios X, associada ao método de refinamento estrutural de Rietveld, mostrou que a fase principal obtida é a do tipo cerianita e que para temperaturas de tratamento inferiores à 700ºC não há formação de fase secundária (monofásica). A 1000ºC, observa-se a formação das seguintes fases secundárias: titanato de samário quando as composições de 0,05'<OU='x<0,20 e Ti'O IND. 2' rutilo quando x'> OU ='0,20. O levantamento da isoterma de adsorção de nitrogênio a 77 K mostrou que a amostra com composição de titânio à x=0,05 foi a que apresentou maior área superficial... / This work aimed to prepare the electronic and ionic mixed conductor 'Ti IND. x''('Sm IND. 0,2''Ce IND. 0,8') IND. (1-x)''O IND. (2-Б) by polymeric precursor method and study the effect of homovalent ion (titanium) addition on the structure and electric properties of the samarium doped cerium oxide to apply as anode in solid oxide fuel cell (SOFC) operating at lower temperatures. The titanium was added by keeping the cerium and samarium ratio as 4:1, constituting the 'Ti IND. x''('Sm IND. 0,2''Ce IND. 0,8') IND. (1-x)''O IND. (2-Б) system, to provide electronic conductivity without lowering the ionic one. The characterization was carried out by simultaneous thermal analysis (TG/DSC), X ray diffractrometry (XRD) which data were refined by Rietveld method, nitrogen adsorption analysis at 77K (BET), scanning electron microscopy (SEM), semiquantitative elementar analysis by energy dispersive X ray (EDX) and impedance spectroscopy. The thermal analysis showed that a temperature close to 700ºC is enough to eliminate the organic compounds. The X ray diffractrometry showed that the samples are monophase constituted by cerianite when the treatment temperature is lower than 700ºC. When the sample is treated at 1000ºC, the secondary phases of samarium titanate and rutile (Ti'O IND. 2') are observed for the compositions of 0,05'<OU='x<0,20 e Ti'O IND. 2', respectively. The nitrogen adsorption isotherm at 77K showed that the sample with titanium composition of x=0.05 has the highest surface area. For lower concentration, x<0.05, the sintering process is intensified as the sample with x=0.01 showed the highest sinterization. The compositional analysis by energy dispersive X ray (EDX) showed a good agreement with the nominal composition. Porous films were obtained by slurry coating and the morphology was analyzed by scanning electronic microscopy... (Complete abstract click electronic access below)

A program of study has been established for the quantitative study of electrode reactions in solid oxide fuel cells. The initial focus of the program is the mixed conducting cathode material strontium-doped lanthanum manganate (LSM). A formalism was established treating reactions taking place at the gas-exposed surface of mixed conducting electrodes. This formalism was incorporated into a phenomenological model for oxygen reduction in LSM, which treats the phenomenon of sheet resistance. Patterned electrodes were designed that reduce the dimensionality of the appropriate model, and these electrodes were successfully fabricated using DC sputtering and photolithography. A new model for the bulk defect equilibrium in LSM was proposed and shown to be a better fit to nonstoichiometry data at low temperatures. The fitting was carried out with a particle swarm optimizer and a rigorous method for identification. It was shown that a model for the interface structure between LSM and yttria-stabilized zirconia (YSZ) that assumes free oxygen vacancies in YSZ does not accord with experimental observations. Cluster variation method (CVM) was adapted for analysis of the problem, and a new analytical method combining CVM and electrical contributions to the free energy was proposed.

京都大学 / 新制・課程博士 / 博士(理学) / 甲第23721号 / 理博第4811号 / 新制||理||1689(附属図書館) / 京都大学大学院理学研究科化学専攻 / (主査)教授 北川 宏, 教授 吉村 一良, 教授 竹腰 清乃理 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM

Orientador: Margarida Juri Saeki / Banca: Valter Ussui / Banca: Eliana Navarro dos Santos Muccillo / Banca: Marcos Antonio Coelho Berton / Banca: Alejandra Hortencia Miranda González / O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp / Resumo: O objetivo deste trabalho foi preparar, pelo método dos precursores poliméricos, condutores mistos (eletrônico e iônico) de 'Ti IND. x'('Sm IND. 0,2'Ce IND. 0,8') IND. (1-x)'O IND. (2-Б) e estudar o efeito da adição de um íon homovalente (titânio) na propriedade estrutural e elétrica do óxido de cério dopado com samário, visando a sua aplicação como anodo em células a combustível (SOFC) que opera em temperaturas reduzidas. A adição do titânio se deu mantendo a substituição do cério por samário (íon aliovalente) à 20% em mol, constituindo o sistema 'Ti IND. x'('Sm IND. 0,2'Ce IND. 0,8') IND. (1-x)'O IND. (2-Б), na tentativa de prover condutividade eletrônica sem degradar a iônica. A caracterização física dos materiais obtidos foi feita por: análises térmicas (TG/DSC), difratometria de raios X (DRX) com refinamento estrutural pelo método de Rietveld, análise textural por adsorção de nitrogênio a 77K (BET), microscopia eletrônica de varredura (MEV), análise elementar semi-quantitativa por energia dispersiva de raios X (EDX) e espectroscopia de impedância (caracterização elétrica). A análise termogravimétrica mostrou que temperaturas próximas à 700ºC é suficiente para que o material estivesse praticamente livre de orgânicos. A difratometria de raios X, associada ao método de refinamento estrutural de Rietveld, mostrou que a fase principal obtida é a do tipo cerianita e que para temperaturas de tratamento inferiores à 700ºC não há formação de fase secundária (monofásica). A 1000ºC, observa-se a formação das seguintes fases secundárias: titanato de samário quando as composições de 0,05'<OU='x<0,20 e Ti'O IND. 2' rutilo quando x'> OU ='0,20. O levantamento da isoterma de adsorção de nitrogênio a 77 K mostrou que a amostra com composição de titânio à x=0,05 foi a que apresentou maior área superficial... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This work aimed to prepare the electronic and ionic mixed conductor 'Ti IND. x'('Sm IND. 0,2'Ce IND. 0,8') IND. (1-x)'O IND. (2-Б) by polymeric precursor method and study the effect of homovalent ion (titanium) addition on the structure and electric properties of the samarium doped cerium oxide to apply as anode in solid oxide fuel cell (SOFC) operating at lower temperatures. The titanium was added by keeping the cerium and samarium ratio as 4:1, constituting the 'Ti IND. x'('Sm IND. 0,2'Ce IND. 0,8') IND. (1-x)'O IND. (2-Б) system, to provide electronic conductivity without lowering the ionic one. The characterization was carried out by simultaneous thermal analysis (TG/DSC), X ray diffractrometry (XRD) which data were refined by Rietveld method, nitrogen adsorption analysis at 77K (BET), scanning electron microscopy (SEM), semiquantitative elementar analysis by energy dispersive X ray (EDX) and impedance spectroscopy. The thermal analysis showed that a temperature close to 700ºC is enough to eliminate the organic compounds. The X ray diffractrometry showed that the samples are monophase constituted by cerianite when the treatment temperature is lower than 700ºC. When the sample is treated at 1000ºC, the secondary phases of samarium titanate and rutile (Ti'O IND. 2') are observed for the compositions of 0,05'<OU='x<0,20 e Ti'O IND. 2', respectively. The nitrogen adsorption isotherm at 77K showed that the sample with titanium composition of x=0.05 has the highest surface area. For lower concentration, x<0.05, the sintering process is intensified as the sample with x=0.01 showed the highest sinterization. The compositional analysis by energy dispersive X ray (EDX) showed a good agreement with the nominal composition. Porous films were obtained by slurry coating and the morphology was analyzed by scanning electronic microscopy... (Complete abstract click electronic access below) / Doutor

La technologie des membranes céramiques pour la production d’oxygène pur connaît un intérêt croissant pour remplacer le procédé de distillation cryogénique, très coûteux sur le plan énergétique. Cependant, à l’heure actuelle, les flux d’oxygène produits par la technologie membranaire ne sont pas suffisamment élevés pour être économiquement viable à l’échelle industrielle. Il est donc nécessaire d’améliorer les performances des membranes. Les résultats obtenus à travers ce travail de thèse, à l’aide d’un dispositif original, nous ont permis de mieux cerner les paramètres architecturaux permettant l’amélioration du flux de semi-perméation à l’oxygène en fonction des mécanismes limitant le transport de l’oxygène à travers la membrane. De ce fait, il est possible d’orienter les recherches vers des architectures plus complexes répondant au moins partiellement aux objectifs industriels. / The technology of ceramic membranes for oxygen separation knows a great interest due to high energetic efficiency in comparison with the cryogenic distillation process. However, for now, the oxygen fluxes produced by the membrane technology are not high enough for industrial applications. It is therefore necessary to improve the performances of the membranes. The results obtained in this work, using an original device, allowed us to a better understanding of the influence of architectural parameters on the oxygen flux and on the mechanisms limiting the transport of oxygen through the membrane. As a result, it is possible to investigate new architectures of membrane of which the oxygen flux could be close to industrial targets.

Made available in DSpace on 2014-06-11T19:23:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-09-21Bitstream added on 2014-06-13T18:50:39Z : No. of bitstreams: 1 pereira_tj_me_bauru.pdf: 1565927 bytes, checksum: 1adb925b5730cee1bd464613d8886996 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / O objetivo deste trabalho foi preparar, pelo método de precursor polimérico, condutores mistos (eletrônico e iônico) de perovskita de 'La IND.0,6''Sr IND.0,4''Fe IND.y''Co IND.1-y''O IND.3-'delta'', para serem utilizados como cátodo em SOFC. Os materiais foram desenvolvidos para que os eletrodos constituídos promovessem a reação de redução de oxigênio (RRO) mesmo em temperaturas reduzidas para possibilitar a operação das SOFCs em temperatura moderada. A caracterização física dos materiais obtidos foi feita por medidas de TG/DSC, difratometria de raios X (DRX) com refinamento das estruturas pelo Método de Rietveld, microscopia eletrônica de varredura (MEV) e análise composicional por espectroscopia dispersiva de raios X (EDS). Observou-se que a total eliminação da matéria orgânica dos precursores é importante para a formação da fase perovskita e que a quantidade dessa fase é dependente do conteúdo de cobalto e da temperatura de calcinação. De modo geral, à medida que se aumenta o conteúdo em cobalto aumenta a quantidade de fases secundárias (Sr'CO IND.3', 'Co IND. 2''O IND. 3' e Se'Fe IND.12''O IND.19'). Observou-se também que a fase perovskita é melhor descrita quando se adota a simetria R-3cH. Na caracterização eletroquímica, feita por levantamento da curva de polarização em estado estacionário e espectroscopia de impedância, melhores resultados foram observados parao sistema y=1. Reações entre o eletrólito de YSZ e perovskitas e flutuações composicionais destas podem ter ocorrido no caso dos eletrodos contendo cobalto resultando em desempenhos insatisfatórios. Além disso, a causa desse desempenho pode estar no aumento da temperatura de calcinação, necessário para obter adequada aderência das perovskitas contendo cobalto, e que resultou em eletrodos com baixa porosidade com desvios na composição. / In this work, 'La IND.0,6''Sr IND.0,4''Fe IND.y''Co IND.1-y''O IND.3-'delta'' perovskite mixed conductor (electronic and ionic) was prepared by polymeric precursor mehod to be used as cathodes for SOFCs. The materials were developed to promote the oxygen reduction reaction (ORR) at the reduced temperatures to make possible the moderated temperature operation of SOFCs. The physical characterization of the obtained material was carried out by TG/DCS, X ray diffractometry using the Rietveld Method for structure refinement, scanning electronic microscopy (SEM) and compositional analysis by energy dispersive X ray spectroscopy (EDS). It was observed that the complete organic matter elimination from the precursors is important to obtain the perovskite phase and that the amount of this phase is dependent of the cobalt content and calcination temperature. In general, as increases the cobalt content increases the amount of secondary phases (Sr'CO IND.3', 'Co IND. 2''O IND. 3' e Se'Fe IND.12''O IND.19'). Also, it was observed that the perovskite phase is better described when the R-3cH symmetry is adopted in the structure refinement. In the electrochemical studies, by stationary polarization and impendance spectrocopy, better results were observed for the system with y=1. Reactions between YSZ electrolyte and perovskites and compositional fluctuation can take place in the case of cobalt containing electrodes, resulting in an unsatisfactory performance. The increasing in the calcination temperature, required to the appropriate adherence between the cobalt containing electrodes and electrolyte, also resulted electrodes with low porosity with composition deviations.

Les systèmes électrochromes suscitent un intérêt croissant dû au fait qu’ils permettent un contrôle des propriétés optiques dans le domaine du visible et du proche infrarouge.Lors d’une précédente étude, la synthèse d’électrolytes NaSICon (Na+ SuperIonicConductor) a été réalisée. Il est alors possible de développer des systèmes électrochromes « tout céramique » à mouvement de sodium par pulvérisation cathodique. Ce travail de thèse, s’articule autour de deux axes :Le premier concerne le développement de la contre-électrode du dispositif. Des films minces ont été synthétisés dans le système Na-W-O par pulvérisation de cibles Na2WO4. Le réglage de la pression de travail permet un contrôle du rapport Na/W. Il est alors possible de synthétiser des films nanocristallisés de NaxWO3+. Des caractérisations électrochimiques par voltampérométrie cyclique ont démontré la possibilité d’y insérer réversiblement du sodium. Il est alors envisageable d’utiliser ces composés comme couche électrochrome, et d’utiliser des films de WO3 épais comme contre-électrode.Le deuxième volet est l’étude d’électrodes conductrices transparentes d’oxyde de zinc dopé à l’aluminium (ZnO:Al). De fortes variations des propriétés de conduction électronique ont été observées. Les films les plus résistifs présentent une augmentation du paramètre c de la maille, et une faible mobilité des porteurs de charges en cohérence avec la présence de lacunes de zinc et une sur-stoechiométrie en oxygène. De plus, la structure électronique des films montre l’existence de deux coordinations différentes des atomes d’aluminium vis-à-vis de l’oxygène. Ces analyses suggèrent la formation d’une structure homologue (ZnO)mAl2O3 / Electrochromic systems are currently attracting increasing interest because they allow control of optical properties in the visible and near infrared. In a previous study, NaSICon (Na+ Super Ionic Conductor) electrolytes were synthesized as thin films by physical vapour deposition. It is therefore possible to develop an “all-ceramic” electrochromic system with sodium movement synthesized by magnetron sputtering. This work focuses on two resaerch areas:The first part concerns the development of the device’s counter electrode. Thin films were synthesized in the Na-W-O system by sputtering Na2WO4 targets. Adjustment of the work pressure allows the control of the Na/W ratio. Indeed, it is possible to synthesize nanocrystallized films of NaxWO3+ with x<1Electrochemical characterizations by voltamperometry showed the possibility to insert reversibly sodium. It is possible to use these compounds as electrochromic layer, and to use thick films of WO3 as counter electrode. The second part is the study of transparent conductive electrodes of aluminium doped zinc oxide (ZnO : Al). Strong variations of electronic conduction were observed. The most resistive films show on one hand an increase of the parameter c of the cell, and also a low mobility of charge carriers (optical measurements) consistent with the presence of zinc vacancies and oxygen over-stoichiometry. In addition the electronic structure of films, probed by XANES spectroscopy, shows the existence of two different coordinations of the aluminum atoms with oxygen. These observations suggest deterioration in the conductivity by the formation of a homologous structure (ZnO) mAl2O3

This thesis details research performed in modeling, simulation, and rational design of porous SOFC cathodes via development, extension, and use of the key tools to aid in the fundamental understanding and engineering design of cathode materials. Phenomenological modeling of triple phase boundary (TPB) reactions and surface transport on La₁₋ₓSrₓMnO₃ (LSM) was conducted, providing insight into the role of the bulk versus surface oxygen reduction pathway and the role of sheet resistance in thin-film patterned electrode measurements. In response to observation of sheet resistance deactivation, a modeling study was conducted to design thin-film patterned electrodes with respect to sheet resistance. Additionally, this thesis outlines the application of phenomenological chemical kinetics to describe and explain the performance and stability enhancements resulting from surface modification of La₁₋ₓSrₓCo₁₋yFeyO₃₋delta (LSCF) with a conformal LSM coating. The analysis was performed in close coordination with electrochemical experiments and transmission electron microscopy. Finally, the thesis describes conformal modeling of porous cathode microstructures using chemical kinetics and transport models. A novel application of conservative point defect ensembles was developed to allow simulations with complicated chemical surface kinetics to be efficiently coupled with bulk transport within the porous structure. The finite element method was employed to simulate electrochemical response conformal to sintered porous ceramic structures using actual 3D microstructural reconstructions obtained using x-ray microtomography. Mesh refinement, linear, and nonlinear reaction rate kinetics were employed to study the bulk versus surface oxygen reduction pathways and the effect of near-TPB nanostructure.

Resumo: O objetivo deste trabalho foi preparar, pelo método de precursor polimérico, condutores mistos (eletrônico e iônico) de perovskita de 'La IND.0,6'Sr IND.0,4'Fe IND.y'Co IND.1-y'O IND.3-'delta', para serem utilizados como cátodo em SOFC. Os materiais foram desenvolvidos para que os eletrodos constituídos promovessem a reação de redução de oxigênio (RRO) mesmo em temperaturas reduzidas para possibilitar a operação das SOFCs em temperatura moderada. A caracterização física dos materiais obtidos foi feita por medidas de TG/DSC, difratometria de raios X (DRX) com refinamento das estruturas pelo Método de Rietveld, microscopia eletrônica de varredura (MEV) e análise composicional por espectroscopia dispersiva de raios X (EDS). Observou-se que a total eliminação da matéria orgânica dos precursores é importante para a formação da fase perovskita e que a quantidade dessa fase é dependente do conteúdo de cobalto e da temperatura de calcinação. De modo geral, à medida que se aumenta o conteúdo em cobalto aumenta a quantidade de fases secundárias (Sr'CO IND.3', 'Co IND. 2'O IND. 3' e Se'Fe IND.12'O IND.19'). Observou-se também que a fase perovskita é melhor descrita quando se adota a simetria R-3cH. Na caracterização eletroquímica, feita por levantamento da curva de polarização em estado estacionário e espectroscopia de impedância, melhores resultados foram observados parao sistema y=1. Reações entre o eletrólito de YSZ e perovskitas e flutuações composicionais destas podem ter ocorrido no caso dos eletrodos contendo cobalto resultando em desempenhos insatisfatórios. Além disso, a causa desse desempenho pode estar no aumento da temperatura de calcinação, necessário para obter adequada aderência das perovskitas contendo cobalto, e que resultou em eletrodos com baixa porosidade com desvios na composição. / Abstract: In this work, 'La IND.0,6'Sr IND.0,4'Fe IND.y'Co IND.1-y'O IND.3-'delta' perovskite mixed conductor (electronic and ionic) was prepared by polymeric precursor mehod to be used as cathodes for SOFCs. The materials were developed to promote the oxygen reduction reaction (ORR) at the reduced temperatures to make possible the moderated temperature operation of SOFCs. The physical characterization of the obtained material was carried out by TG/DCS, X ray diffractometry using the Rietveld Method for structure refinement, scanning electronic microscopy (SEM) and compositional analysis by energy dispersive X ray spectroscopy (EDS). It was observed that the complete organic matter elimination from the precursors is important to obtain the perovskite phase and that the amount of this phase is dependent of the cobalt content and calcination temperature. In general, as increases the cobalt content increases the amount of secondary phases (Sr'CO IND.3', 'Co IND. 2'O IND. 3' e Se'Fe IND.12'O IND.19'). Also, it was observed that the perovskite phase is better described when the R-3cH symmetry is adopted in the structure refinement. In the electrochemical studies, by stationary polarization and impendance spectrocopy, better results were observed for the system with y=1. Reactions between YSZ electrolyte and perovskites and compositional fluctuation can take place in the case of cobalt containing electrodes, resulting in an unsatisfactory performance. The increasing in the calcination temperature, required to the appropriate adherence between the cobalt containing electrodes and electrolyte, also resulted electrodes with low porosity with composition deviations. / Orientador: Margarida Juri Saeki / Coorientador: Luis Vicente de Andrade Scalvi / Banca: Joelma Perez / Banca: Sonia Regina Homem de Mello Castanho / O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp / Mestre

Le développement de piles à combustibles capables de fonctionner à des températures intermédiaires de l’ordre de 400-600°C présente un grand intérêt tant du point de vue du vieillissement des matériaux que des différents éléments du système complet. Une des technologies envisagées est basée sur l’utilisation d’électrolyte céramique possédant une conduction protonique élevée (Protonic Ceramic Fuel Cell PCFC). A ce jour, un des problèmes principaux concerne les fortes surtensions observées au niveau de la cathode lors du passage d’un courant. Dans ce cadre, le but de nos recherche a été de concevoir de nouveaux matériaux de cathode pour pile PCFC présentant de bonnes propriétés de conduction mixte ionique et électronique ainsi qu’une activité catalytique élevée vis-à-vis de la réaction de réduction de l’oxygène, entre 400 et 600°C. Plusieurs matériaux à conduction mixte ont été synthétisés à l’ICMCB, notamment des perovskites et des oxydes de structure de type Ruddlesden-Popper (en particulier les oxydes A2MO4+?). Des analyses thermogravimétriques ont été réalisées pour étudier la stabilité de ces phases sous air humide, ainsi qu’une éventuelle insertion d’eau dans la structure. Des demi-cellules symétriques ont été élaborées pour les caractérisations éléctrochimiques par spectroscopie d’impédance complexe et voltampérométrie (mesures de résistances spécifiques de surface, courbes de polarisation cathodique). Les caractérisations physico-chimiques et électrochimiques ont permit de sélectionner les meilleurs composés et ont conduit à la réalisation de la première monocellule PCFC utilisant le matériau de cathode Pr2NiO4+?. Des densités de puissance de 100 mW/cm² ont été mesurées pour une température de fonctionnement de 600°C. / Development of Fuel Cell operating at intermediate temperatures (400-600°C) is more and more interesting regarding ageing of materials. One of these technologies is based on ceramic electrolytes with high protonic conductivity (Protonic Ceramic Fuel Cell, PCFC). Nowadays, the major problem is overpotential at the cathode side, under polarization. In this context, our researches aimed to elaborate new cathode materials for PCFC with high mixed conductivity and good electrocatalytic property toward oxygen reduction, between 400 and 600°C. Several materials have been synthesised at the ICMCB, like perovskites and Ruddlesden-Popper type phase (A2MO4+?). Thermogramvimetric analyses have been realised in order to study phase stability under moist air and a possible insertion of water in the structure. Symmetrical half-cells have been elaborated for Electrochemical Impedance Spectroscopy and voltametric measurements (measure of Area Specific Resistance, cathodic polarization curves). The physico-chemical and electrochemical characterizations were useful to choose the best compounds and lead to fabrication of the first cell PCFC with Pr2NiO4+? as cathode materials. Power densities of 100mW/cm² have been reached for a working temperature of 600°C.