Theoretical optimisation of a SOFC composite cathode

Deseure, Jonathan; Bultel, Yann; Dessemond, Laurent; Siebert, Elisabeth

doi:10.1016/j.electacta.2004.09.012

Cited by 137 publications

(104 citation statements)

References 28 publications

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“…Volumespecific TPB surface area is estimated according to [17] as [17] where u v is the oxygen ion mobility, defined as…”

Section: Insert Conductances Ijmentioning

confidence: 99%

“…Models have also contributed novel observations about electrode performance and its relationship to interfacial microstructure. In particular, the dependence of performance on the physical size of particles and the entire electrode have been recreated through simulation by researchers such as Costamagna et al, Deseure et al and others [15][16][17][18][19]; the dependence on electrode composition has been repeatedly found to be of particular importance [15][16][17][19][20][21]; the dependence of likelihood of TPB formation on location within the electrode has been characterized by the work of Costamagna et al as well as through the current model [21,15]; the dependence on the ratio of electronic-to-ionic conductivity has been identified [16]; the effect of functional and compositional grading in the electrode has been characterized by Deseure et al and Schneider et al [17,19]; the dependence of TPB formation on the geometry of the current collector and the intermixing of gaseous and electronically conducting phases in this boundary has been noted to be of particular importance through the previous use of the current model [21]; and the approximation that a TPB length is roughly three times the radius of a representative particle has been calculated [20].…”

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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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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“…Volumespecific TPB surface area is estimated according to [17] as [17] where u v is the oxygen ion mobility, defined as…”

Section: Insert Conductances Ijmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Finally, some studies have considered electrodes in which the size of the particles and the volumetric fraction of each phase can change in depth [14,15]. This affects the properties of the medium.…”

Section: Introductionmentioning

confidence: 99%

Theoretical considerations on the modelling of transport in a three-phase electrode and application to a proton conducting solid oxide electrolysis cell

Dumortier

Sánchez

Keddam

et al. 2012

International Journal of Hydrogen Energy

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Theoretical considerations on the modelling of transport in a three-phase electrode and application to a proton conducting solid oxide electrolysis cell. International Journal of Hydrogen Energy, Elsevier, 2012, 37 (16) The paper presents a complete numerical model for the prediction of mass and charge transfer inside electrolysis cells and fuel cells working at high temperature and using cermets as electrodes. It also discusses some assumptions taken in fuel cells or electrolysis cells modelling.I think that the problems dealt in this paper are in perfect match with the topics covered by the International Journal of Hydrogen Energy. Indeed many articles that were published in the journal served as a basis for this work.Meng Ni, from the University of Hong Kong, M.M Hussain, from the University of Waterloo and Anchasa Pramuanjaroenkija, from the University of Miami, would represent in my view relevant reviewers for this paper. As specialists in fuel cells and electrolysis cells modelling, they can rigorously evaluate the scientific content of this paper. Moreover, several assumptions they use for their models are discussed in the paper.I am fully available from the first of January to deal with the reports of the reviewers.I will be pleased to supply any further information should it be required.Yours sincerely, Mikael DumortierCover LetterDemonstration of continuity equations for mass and charge inside a cermet electrode *Manuscript Click here to view linked References Abstract

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“…Em uma amostra, o MLS foi depositado sobre a pastilha de ZEI e na outra a deposição foi feita sobre a CF. A porosidade da amostra Tcomp/MLS é inferior devido provavelmente a uma maior coalescência entre o MLS e o ZEI e, segundo dados da literatura [14], dentro dos limites otimizados.…”

Section: Resultados E Discussõesunclassified

A importância da camada funcional em meia células catódicas para pilhas PaCOS

Belardi¹,

Domingues²,

Matencio³

et al. 2008

Matéria (Rio J.)

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RESUMOO grande desafio para se melhorar o desenvolvimento de pilhas a combustível de óxido sólido (PACOS) é diminuir as resistências de polarização ôhmica e de polarização de concentração, sobretudo no catodo. Uma alternativa efetiva é a introdução de uma camada catódica funcional entre o eletrólito e o catodo convencional. Esta camada funcional é um compósito constituído pelos materiais de eletrólito e catodo que neste caso são a zircônia estabilizada com ítria (ZEI) e a manganita de lantânio e estrôncio (MSL). Esta camada melhora o contato entre o catodo e o eletrólito diminuindo a resistência ôhmica de polarização de concentração devido ao aumento do número de pontos de contato triplo (PCT) no volume do material.Neste trabalho, duas meias células foram preparadas: a primeira é constituída por um filme catódico funcional (50% p/p) e a camada coletora de corrente depositados sobre uma pastilha de ZEI. A segunda meia célula é composta apenas pela camada catódica de MSL também depositada sobre a pastilha de ZEI.O estudo elétrico foi realizado por espectroscopia de impedância na faixa de temperatura entre 700 e 900 °C. As resistências das amostras diminuíram com o aumento da temperatura e, foi observado que a meia célula que possuía o catodo funcional apresentou menores resistências elétricas. Após tratamento térmico a 750°C por 3 dias foi verificado que a amostra sem a camada funcional apresentou um semicírculo adicional no diagrama de impedância caracterizado como uma resistência devida a baixa aderência eletrólito/catodo. Este fenômeno foi confirmado por imagens de microscopia eletrônica de varredura (MEV). Palavras-chaves: MLS, Espectroscopia de impedância, catodo funcional. The importance of the functional layer in SOFC half cathodic cell ABSTRACTThe greatest challenge to improve SOCF (Solid Oxide Fuel Cell) development is to decrease polarization and ohmic concentration resistances mainly for the cathode. One effective alternative is the introduction of a functional cathode layer between the electrolyte and the conventional cathode. This functional cathode layer is a composite constituted by the electrolyte and cathode materials, in this case, yttria stabilized zirconia (YSZ) and lanthanum doped strontium (LSM). This layer improves the contact between the cathode and the electrolyte decreasing the ohmic concentration polarization due to the increasing of triple contact points (TPB) in the bulk concentration.In this work, two half cells were prepared: the first one is constituted by a functional cathode film (50% in weight), and a collecting current layer (LSM) both deposited on a YSZ pellet. The second half cell is composed by a LSM cathode layer deposited on the YSZ Tosoh pellet.The electric study has been realized by Impedance Spectroscopy varying the temperature from 700 to 900 ºC. The two half cells resistance decreased with increasing the temperature, and it has noted that the half cell with the functional cathode layer presented the lowest resistance. After annealing at 750 °C for 3 days, the sample wi...

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Theoretical optimisation of a SOFC composite cathode

Cited by 137 publications

References 28 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

Theoretical considerations on the modelling of transport in a three-phase electrode and application to a proton conducting solid oxide electrolysis cell

A importância da camada funcional em meia células catódicas para pilhas PaCOS

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