Nanoscaled La0.6Sr0.4CoO3−δ as intermediate temperature solid oxide fuel cell cathode: Microstructure and electrochemical performance

Hayd, Jan; Dieterle, Levin; Guntow, Uwe; Gerthsen, D.; Ivers-Tiffée, Ellen

doi:10.1016/j.jpowsour.2010.11.147

Cited by 122 publications

(115 citation statements)

References 21 publications

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“…The ASR dependence on temperature follows an Arrhenius-type law for both the YSZ and the LSC, with activation energies of E a =1.05(1) eV and E a =1.54(4) eV, respectively. These values are in concordance with previously reported values for the corresponding bulk materials (see [31,54,[56][57][58] for YSZ and [21,22,24,42] for LSC).…”

Section: Accepted Manuscriptsupporting

confidence: 93%

“…LSC resistivity values were similar or slightly higher than other previously reported thin films of LSC (some of them also plotted on the figure for direct comparison [21,22,42]). This small discrepancy can be attributed to the well-known dependency of the oxygen surface exchange properties and electrolyteelectrode polarization resistances on the fabrication routes.…”

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

confidence: 81%

“…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%

“…In this sense, alternative electrolytes or barrier diffusion layers are sometimes introduced between the electrolyte and the cathode for reducing these effects but still degradation by detachment is present [39][40][41]. The implementation of the LSC layer in porous thin film form has been recently proposed as a good solution for this particular problem showing very promising results in the intermediate range of temperatures (T<700ºC) [21][22][23]42]. It is important to notice here that either increasing the density of LSC thin films (internal lattice strain fields involved, [43][44][45][46]) or lowering the pO 2 [47] can induce Sr segregation and mid-term quick degradation.…”

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

confidence: 99%

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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

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Section: Accepted Manuscriptsupporting

confidence: 93%

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

confidence: 81%

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

confidence: 99%

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

confidence: 99%

See 2 more Smart Citations

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

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“…[21][22][23]. The BSCF based, symmetrical cells were in-situ sintered with a final temperature step at 900…”

Section: Methodsmentioning

confidence: 99%

Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

Almar

Szász

Weber

et al. 2017

J. Electrochem. Soc.

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The oxygen reduction reaction of mixed ionic-electronic conducting (MIEC) cathodes Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) and La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) is investigated by detailed electrochemical impedance spectroscopy and focused ion beam tomography. The oxygen transport parameters of these materials are usually determined for model systems, such as dense bulks or thin films. However in the present study, probable differences regarding the time and thermal history of the samples (e.g. ambient poisoning gases, grain coarsening, secondary phase or surface segregation, etc.) were avoided by the in situ sintering of electrodes with nominal stoichiometry under synthetic air. The microstructural parameters of the electrodes are obtained by 3D FIB-SEM reconstruction tomography and subsequently used in combination with the Adler-Lane-Steele analytical model to calculate a simulated cathode resistance. Large discrepancies are observed compared to the electrochemical impedance measurements. In particular, the electrochemical impedance measurements do not show a Gerischer behavior, as expected for MIEC materials controlled by a coupled surface-exchange and bulk diffusion. Analysis by distribution function of relaxation times (DRT) reveals four individual processes taking place, indicating a surface-exchange controlled behavior with a reaction zone similar to the particle size. Bulk diffusion (D) and surface-exchange (k) coefficients from literature are critically discussed and tentative surface-exchange coefficients (k) for both MIECs are given. High-temperature devices such as solid oxide fuel cells (SOFCs) and oxygen transport membranes (OTMs) are promising systems for working towards zero-emissions power generation. The selected materials require high chemical and microstructural stability, as well as high catalytic activity during the oxygen reduction reaction (ORR), under normal operational conditions (i.e. operational temperature and oxygen partial pressure). Particularly interesting are the mixed ionic-electronic conducting (MIEC) materials, based on the ABO 3 perovskite structure. Their material properties can be flexibly customized, giving solid solutions with high ionic-electronic conductivity and hence good transport properties. More specifically, La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) has become established as the stateof-the-art SOFC cathode, while Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) has presented outstanding oxygen permeation flux in its cubic phase. 1-3The surface-exchange coefficient (k) and the oxygen diffusion coefficient (D) provide key information about the oxygen transport mechanism that dominates the cathodic ORR. Many publications have assessed the D and k values of MIEC materials, most commonly by; electrical conductivity relaxation (ECR) measurements for dense bulks [4][5][6][7][8] and temperature for LSCF cathodes. 17 Here it should be pointed out that the well-known ALS model can only be applied if the measured impedance shows a Gerischer impedance, which indicates tha...

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Cathodes for Solid Oxide Fuel Cell

Zhou

Jin

2020

Solid Oxide Fuel Cells

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Nanoscaled La0.6Sr0.4CoO3−δ as intermediate temperature solid oxide fuel cell cathode: Microstructure and electrochemical performance

Cited by 122 publications

References 21 publications

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

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

Oxygen Transport Kinetics of Mixed Ionic-Electronic Conductors by Coupling Focused Ion Beam Tomography and Electrochemical Impedance Spectroscopy

Cathodes for Solid Oxide Fuel Cell

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