A Coupled Experimental/Numerical Approach for Tuning High-Performing SOFC-Cathode

Çelikbilek, Ӧzden; Jauffrès, David; Dessemond, Laurent; Burriel, Mónica; Martín, Christophe; Djurado, Elisabeth

doi:10.1149/07207.0081ecst

Cited by 8 publications

(7 citation statements)

References 26 publications

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“…Some of these works include comparison with experimental data showing that even a simplified geometry model provides a good estimation of the electrode performance [59,64], and can be used to study the influence of the microstructure on the performance. Besides, no fitting procedures are used for the model input parameters as they are obtained by independent experimental characterization.…”

Section: Electrode Models Based On a Simplified Microstructure Geometrymentioning

confidence: 99%

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Modelling of solid oxide cell oxygen electrodes

et al. 2023

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Numerical models are versatile tools to study and predict efficiently the performance of Solid Oxide Cells (SOCs) according to their microstructure and composition. As the main contribution to the cell polarisation is due to the oxygen electrode, a large part of the proposed models has been focused on this electrode. Electrode modelling aims to improve the SOCs performance by serving as a guide for the microstructural optimisation, and helps to better understand the electrochemical reaction mechanisms. For studying the electrode microstructure, three categories of models can be distinguished: homogenised models, simplified geometry based models, and reconstructed microstructure based models. Most models are based on continuum physics, while elementary kinetic models have been developed more recently. This article presents a review of the existing SOCs models for the oxygen electrode. As a perspective, the current challenges of electrode modelling are discussed in views of a better prediction of the performance and durability, and more specifically for the case of thin-film SOCs.

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Section: Electrode Models Based On a Simplified Microstructure Geometrymentioning

confidence: 99%

“…Secondly, the model is solved through either an analytical approach or numerical methods using either a commercial software (e.g. Matlab, COMSOL Multiphysics [21][22][23], ANSYS [24]) or within the framework of an in-house or open-source code (e.g. Parcell3D [25,26]).…”

Section: Introductionmentioning

confidence: 99%

Modelling of solid oxide cell oxygen electrodes

et al. 2023

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“…The obtained polarisation resistance results were comparable with the well-known LSCF electrode materials. An area specific resistance (ASR) of 0.020 Ω cm 2 at 650°C [42] has been reported for LSCF, whereas for SrTi 0.1 Fe 0.9 O 3 (STF90), an ASR of 0.067 Ω cm 2 at 650°C has been reported [43]. Some reports show that STFx material with x = 0.35 has the lowest degree of structural distortions, which makes it promising for technical applications [44] despite its relatively low electronic conductivity (~2 S cm −1 ) and higher ASR values (~0.1 Ω cm 2 at 800°C [40]).…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on electrochemical performance of porous SrTi1-xFexO3-δ (x = 0.35, 0.5, 0.7) oxygen electrodes for solid oxide cells

Mroziński

Molin

Jasiński

2020

J Solid State Electrochem

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This work evaluates the effects of the sintering temperature (800°C, 900°C, 1000°C) of SrTi 1-x Fe x O 3-δ (x = 0.35, 0.5, 0.7) porous electrodes on their electrochemical performance as potential oxygen electrode materials of solid oxide cells. The materials were prepared by a solid-state reaction method and revealed the expected cubic perovskite structure. After milling, the powders were characterised by a sub-micrometre particle size with high sinter-activity. It was shown that the lowest area specific resistance was achieved after sintering SrTi 0.65 Fe 0.35 O 3 electrodes at 1000°C, and SrTi 0.5 Fe 0.5 O 3 and SrTi 0.30 Fe 0.70 O 3 electrodes at 800°C, which can be considered to be a relatively low temperature. In general, EIS measurements showed that increasing the Fe content results in lowered electrode polarisation and a decrease of the series resistance. Even though the studied materials have much lower total conductivities than state-of-the-art electrode materials (e.g. (La,Sr)(Co,Fe)O 3 ), the polarisation resistances obtained in this work can be considered low.

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“…However, powder sintering and infiltration-derived LSCF-GDC cathodes are not suitable for use in micro-SOFCs, due to the high heat treatment temperatures (850-1000 °C) required in at least one of their processing steps [8]. Cathode layers in the form of thin films, on the other hand, can be fabricated by pulsed laser deposition (PLD) [32], radiofrequency (RF) magnetron sputtering [33], spray pyrolysis [34,35], and electrostatic spray deposition (ESD) methods [36][37][38]. Among these studies, high polarization resistances of 8 Ω cm 2 at 750 °C and 122 Ω cm 2 at 600 °C were obtained in LSCF thin-film cathodes prepared by PLD [32] and RF magnetron sputtering [33], respectively.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of LSCF and LSCF-GDC nanocomposite thin films using polymeric precursors

Sındıraç

Ahsen

Öztürk

et al. 2019

Ionics

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La 1-x Sr x Co y Fe 1-y O 3 (LSCF) and LSCF-gadolinia-doped ceria (LSCF-GDC) composites are used as solid oxide fuel cell (SOFC) cathodes. In the present study, to maximize the LSCF/gas and LSCF/GDC interfacial area and thus enhance the performance, we fabricated both single-phase LSCF and composite LSCF-GDC thin-film electrodes using a facile and cost-effective polymeric precursor technique. This method involves molecular level mixing of cations in solution form and results in average particle sizes of ca. 72 nm and 60 nm upon annealing at 700 °C, respectively. For LSCF, electrochemical impedance spectroscopy measurements indicate very low electrode polarization resistances of ca. 0.6 Ω cm 2 per electrode at 600 °C. However, the addition of GDC results in poorer electrochemical activity but better microstructural and electrochemical stability, all at 600 °C. Surface analysis revealed that Fe surface segregation occurs in the single-phase LSCF, while predominantly Co segregation is observed at the LSCF-GDC composite electrode surface.

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A Coupled Experimental/Numerical Approach for Tuning High-Performing SOFC-Cathode

Abstract: International audienc

Cited by 8 publications

References 26 publications

Modelling of solid oxide cell oxygen electrodes

Modelling of solid oxide cell oxygen electrodes

Effect of sintering temperature on electrochemical performance of porous SrTi1-xFexO3-δ (x = 0.35, 0.5, 0.7) oxygen electrodes for solid oxide cells

Fabrication of LSCF and LSCF-GDC nanocomposite thin films using polymeric precursors

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