Manganite-zirconia composite cathodes for SOFC: Influence of structure and composition

Østergård, M.J.L.; Clausen, C.; Bagger, C.; Mogensen, Mogens Bjerg

doi:10.1016/0013-4686(94)00332-u

Cited by 253 publications

(139 citation statements)

References 18 publications

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“…It is unclear from previous work whether or not the particle size and shape distributions are significant factors of percolation physics that affect overall cell performance [9][10][11]23].…”

Section: Model Descriptionmentioning

confidence: 99%

“…The effects of these processes and the various features of the raw materials on fuel cell performance have been investigated through many previous studies by empirical methods and the development and application of models [9][10][11][12][13][14]. Experimentalists have identified many parameters that are important to manufacturing electrode-electrolyte interfaces with low ohmic and/or activation losses.…”

Section: Introductionmentioning

confidence: 99%

“…Experimentalists have identified many parameters that are important to manufacturing electrode-electrolyte interfaces with low ohmic and/or activation losses. For example, researchers such as Sasaki et al have identified that material properties such as particle size distribution are particularly important [9][10][11]. In addition, Sasaki et al and Juhl et al have found significant dependence upon manufacturing parameters such as electrode thickness [9,12] and processing temperatures including calcining and sintering steps [9,10,13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and comparison to literature data of composite solid oxide fuel cell electrode–electrolyte interface conductivity

Martinez¹,

Brouwer²

2010

Journal of Power Sources

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a b s t r a c tA Monte Carlo percolation model previously used to characterize Triple Phase Boundary (TPB) formation in composite SOFC electrode-electrolyte interfaces has been augmented to allow for investigation of the effects of composition, gas-phase percolation, and surface exchange and transport phenomena on the overall conductivity of these electrode-electrolyte interfaces. The model has been utilized to replicate the results of a previous modeling effort, with similar assumptions and application to an SOFC electrode electrolyte interface. Although the models are similar in many aspects, their key differences allow equivalent predictions of the behavior of overall electrode conductivity as a function of electrode composition, thereby verifying the assumptions and overall approach of the current model. The validity of omitting charge-transfer and activation resistances when comparing overall interfacial conductivity trends is confirmed. The current model is then used to simulate several experimental results. The comparisons among these results show the importance of including gas-phase percolation physics and surface exchange and transport phenomena features in the model. Including gas-phase percolation and these surface phenomena can significantly alter the predictions of conductivity behavior and better predicts experimental observations, particularly at low and high electronic conductor volume fractions.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling and comparison to literature data of composite solid oxide fuel cell electrode–electrolyte interface conductivity

Martinez¹,

Brouwer²

2010

Journal of Power Sources

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“…These values are primarily very small when compared with data in literatures, suggesting that the mechanically fabricated LSM/ ScSZ composite cathode proposed here is superior to the conventional composite cathodes. For examples Østergård et al 6) reported R e = 0.5 to 4.4 ³ cm 2 and Choi et al 7) measured R e = 0.6 to 1.7 ³ cm 2 for their electrodeelectrolyte composite cathodes. …”

Section: Repeated Lsm Charging Casementioning

confidence: 98%

The effects of preparation conditions on mechanically fabricated composite particles for solid oxide fuel cells

Hobara

Abe

Naito

et al. 2011

J. Ceram. Soc. Japan

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The present paper discusses the effect of material charging in a mechano-chemical particle fabrication process for the production of LSM/ScSZ composite particle material developed for solid oxide fuel cells. The composite particle considered here has a structure where coarse electro-catalyst particles are coated with fine electrolyte particles so that they can be used as "pre-fabricated" electrode microstructure elements. The study reveals that the intended composite particle material can be the most successfully fabricated by repeatedly charging a small amount of fine ScSZ particles and that the electrochemical performance can be improved to a substantial degree when the particle fabrication process is carefully controlled.

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“…A literatura é rica em estudos envolvendo aspectos sobre reatividade química e compatibilidade térmica entre os materiais do catodo e do eletrólito [1][2][3][4][5][6][7], principalmente entre zircônia estabilizada com 8% mol de ítria (ZEI8) e manganitas de lantânio (LaMnO 3 -LM, La 1-x Sr x MnO 3 -LSM entre outros). Stochniol 3 foi para x = 0,3 e y = 0,95, ou seja, LSM deficiente em La (subestequiometria no sítio A).…”

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Efeito de íons aliovalentes nas propriedades elétricas de céria dopada com ítria

Godoi

Souza

2008

Matéria (Rio J.)

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A alta temperatura de operação da PaCOS pode causar a formação de fases resistivas isolantes na interface eletrólito-catodo o que contribui para a perda de eficiência da pilha, podendo-se citar como exemplo a formação de zirconatos na interface manganita de lantânio dopada com estrôncio (LSM) -zircônia estabilizada com ítria (ZEI). Outro aspecto importante em PaCOS é o uso de material de eletrólito com uma condutividade iônica maior do que a da zircônia em temperaturas mais baixas. Essa característica é importante para a redução da temperatura de operação da PaCOS minimizando os problemas relacionados com a alta temperatura de operação, sendo Céria dopada com ítria (CY) um exemplo desse tipo de material. Por isso, para o uso de CY como eletrólito em PaCOS é importante avaliar a possibilidade de formação de fase isolante envolvendo esse material e o material do catodo, como perovskitas de lantânio. Para avaliar possíveis reações entre céria dopada com ítria e dois tipos de perovskitas usadas como catodo, LSM and LSCF, foi realizado, neste trabalho, a dopagem de CY com dois conjuntos de íons: La, Sr, Mn e La, Sr, Fe, Co. A dopagem provocou aumento da condutividade elétrica do grão enquanto que a condutividade efetiva do contorno de grão decresceu. Contudo a condutividade total não foi comprometida com a dopagem. A dopagem com La, Mn e Sr forneceu amostra de Céria dopada com Itria mais estáveis em alta temperatura e atmosfera redutora.Palavras-chaves: céria dopada com ítria, perovskita de lantânio, propriedades elétricas, microestrutura. Effect of aliovalent ions on the electrical properties of Yttria doped Ceria ABSTRACTThe high operating temperature of SOFCs can produces the formation of insulating interphases in the electrolyte-cathode interface contributing for the efficiency loss. As an example, there is the formation of zirconates in the interface strontium doped lanthanum manganite (LSM) -yttria stabilized zirconia (YSZ). Another important aspect in SOFCs concerns to the use of an electrolyte material with a higher ionic conductivity at lower temperatures than that of YSZ. Yttria doped ceria (CY) is an example of this kind of material. This feature is important to reduce the operating temperature of SOFC minimizing the problems related to their high operating temperature. Therefore, if one intends to use CY as an electrolyte in SOFC it is important to evaluate the possibility of any insulating phase formation involving this material and the cathode material, as doped lanthanum perovskites. To verify possible deleterious reactions between yttria doped ceria and two kinds of perovskites cathode, LSM and LSCF, in this work CY composition was doped with two set of ions: La, Sr, Mn and La, Sr, Fe, Co. The doping increased the grain electrical conductivity while the effective grain boundary conductivity decreased, for both set of dopant. Although, the total electrical conductivity stayed almost constant. The La, Mn, Sr doped sample was more stable at high temperature compared with the undoped CY composition.

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Manganite-zirconia composite cathodes for SOFC: Influence of structure and composition

Cited by 253 publications

References 18 publications

Modeling and comparison to literature data of composite solid oxide fuel cell electrode–electrolyte interface conductivity

Modeling and comparison to literature data of composite solid oxide fuel cell electrode–electrolyte interface conductivity

The effects of preparation conditions on mechanically fabricated composite particles for solid oxide fuel cells

Efeito de íons aliovalentes nas propriedades elétricas de céria dopada com ítria

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