The polarization resistance of mixed conducting SOFC cathodes: A comparative study using thin film model electrodes

Baumann, F.; Maier, Joachim; Fleig, Jürgen

doi:10.1016/j.ssi.2008.02.059

Cited by 111 publications

(92 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this limit, I IP eon /I CP eon is approximately proportional to k (eqn (29) and, hence, at fixed p O 2 this ratio and d SIZ increase monotonically with k 0 . In terms of the dependence on oxygen partial pressure both R rxn and R CP eon scale with p 1=4 O 2 , and thus I IP eon /I CP eon and d SIZ do not depend on p O 2 .…”

Section: Influence Of Surface Reaction Rate and Oxygen Partial Pressurementioning

confidence: 88%

Surface reaction and transport in mixed conductors with electrochemically-active surfaces: a 2-D numerical study of ceria

Ciucci

Chueh

Goodwin

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

A two-dimensional, small-bias model has been developed for describing transport through a mixed ionic and electronic conductor (MIEC) with electrochemically-active surfaces, a system of particular relevance to solid oxide fuel cells. Utilizing the h-adaptive finite-element method, we solve the electrochemical potential and flux for both ionic and electronic species in the MIEC, taking the transport properties of Sm 0.15 Ce 0.85 O 1.925Àd (SDC15). In addition to the ionic flux that flows between the two sides of the cell, there are two types of electronic fluxes: (1) cross-plane current that flows in the same general direction as the ionic current, and (2) in-plane current that flows between the catalytically-active MIEC surface and the metal current collectors. From an evaluation of these fluxes, the macroscopic interfacial resistance is decomposed into an electrochemical reaction resistance and an electron diffusion-drift resistance, the latter associated with the in-plane electronic current. Analysis of the experimental data for the interfacial resistance for hydrogen electro-oxidation on SDC15 having either Pt or Au current collectors (W. Lai and S. M. Haile, J. Am. Ceram. Soc., 2005, 88, 2979-2997; W. C. Chueh, W. Lai and S. M. Haile, Solid State Ionics, 2008Ionics, , 179, 1036Ionics, -1041 indicates that surface reaction rather than electron migration is the overall rate-limiting step, and suggests furthermore that the surface reaction rate, which has not been directly measured in the literature, scales with p À1=4 O 2 . The penetration depth for the in-plane electronic current is estimated at 0.6 mm for the experimental conditions of interest to SDC15, and is found to attain a value as high as 4 mm within the broader range of computational conditions.

show abstract

Section: Influence Of Surface Reaction Rate and Oxygen Partial Pressurementioning

confidence: 88%

Surface reaction and transport in mixed conductors with electrochemically-active surfaces: a 2-D numerical study of ceria

Ciucci

Chueh

Goodwin

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Indeed, some attempts have been already reported on the development of pure oxide-based electrodes for fabricating fully-ceramic µSOFC, based on state-of-the-art materials on bulk SOFC systems working as cathodes [19][20][21][22][23][24][25][26][27] or anodes [28]. However, only few results have been reported on µSOFC performance using ceramic electrodes [29][30][31][32].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Garbayo

Esposito

Sanna

et al. 2014

Journal of Power Sources

View full text Add to dashboard Cite

“…Baumann et al [5,6] , and SSC cathodes. The authors showed that among these cobaltites and ferrites, BSCF has the lowest surface exchange resistance; for example, electrochemical surface exchange at a BSCF microelectrode was 50 times lower than at a similar LSCF microelectrode.…”

Section: Introductionmentioning

confidence: 99%

“…These measurements have been performed using point electrodes [5,6,15,18,[52][53][54], porous electrodes in a symmetrical cell [55][56][57][58][59], or three-electrode setup [60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Mosiałek

Dudek

Michna

et al. 2014

J Solid State Electrochem

View full text Add to dashboard Cite

Silver-Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathodes were prepared in two ways. In the first method, Ag-BSCF composite powder was prepared in ethanol solution, where Ag nanoparticles serving as a component in the preparation of Ag-BSCF composite cathodes had been previously obtained via one-step synthesis in absolute ethanol using a neutral polymer (polyvinylpyrrolidone). To the best of our knowledge, this is the first study to use a Ag sol obtained by the above method for preparation of Ag-BSCF composite powder. Then, a paste containing this powder was screen-printed on a Sm 0.2 Ce 0.8 O 1.9 electrolyte and sintered at 1,000°C. In the second technique, an aqueous solution of AgNO 3 was added to a previously sintered BSCF cathode, which was then sintered again at 800°C. The oxygen reduction reaction at the quasi-point BSCF cathode on the Sm 0.2 Ce 0.8 O 1.9 electrolyte was tested by electrochemical impedance spectroscopy at different oxygen concentrations in three electrode setup. The continuous decrease of polarization resistance was observed under polarization −0.5 V at 600°C. The comparative studies of both obtained composite Ag-BSCF materials were performed in hydrogen-oxygen IT-SOFC involving samariadoped ceria as an electrolyte and Ni-Gd 0.2 Ce 0.8 O 1.9 anode. In both cases, the addition of silver to the cathode caused an increase in current and power density compared with an IT-SOFC built with the same components but involving a monophase BSFC cathode material.

show abstract

The polarization resistance of mixed conducting SOFC cathodes: A comparative study using thin film model electrodes

Cited by 111 publications

References 13 publications

Surface reaction and transport in mixed conductors with electrochemically-active surfaces: a 2-D numerical study of ceria

Surface reaction and transport in mixed conductors with electrochemically-active surfaces: a 2-D numerical study of ceria

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Contact Info

Product

Resources

About