Identification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ

Flura, Aurélien; Nicollet, Clément; Fourcade, Sébastien; Vibhu, Vaibhav; Rougier, Aline; Bassat, Jean‐Marc; Grenier, J.‐C.

doi:10.1016/j.electacta.2015.06.084

Cited by 49 publications

(28 citation statements)

References 21 publications

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“…The Bode plot (dependence of the phase angle with frequency) provides useful information to determine the number of processes in complex systems such as composites or porous electrodes . In Figure , the Bode plot corresponding to the composite electrode containing Sr 2 CoTiO 6− δ revealed the presence of three processes at low, intermediate, and high frequencies (denoted as LF, IF, and HF, respectively); a similar behavior is observed for all samples.…”

Section: Resultsmentioning

confidence: 72%

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

et al. 2017

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The perovskite series Sr CoNb Ti O (0≤x≤1) was investigated in the full compositional range to assess its potential as cathode material for solid oxide fuel cell (SOFC). The variation of transport properties and thus, the area specific resistances (ASR) are explained by a detailed investigation of the defect chemistry. Increasing the titanium content from x=0-1 produces both oxidation of Co to Co (from 0 up to 40 %) and oxygen vacancies (from 6.0 to 5.7 oxygen atom/formula unit), although each charge compensation mechanism predominates in different compositional ranges. Neutron diffraction reveals that samples with high Ti-contents lose a significant amount of oxygen upon heating above 600 K. Oxygen is partially recovered upon cooling as the oxygen release and uptake show noticeably different kinetics. The complex defect chemistry of these compounds, together with the compositional changes upon heating/cooling cycles and atmospheres, produce a complicated behavior of electrical conductivity. Cathodes containing Sr CoTiO display low ASR values, 0,13 Ω cm at 973 K, comparable to those of the best compounds reported so far, being a very promising cathode material for SOFC.

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Section: Resultsmentioning

confidence: 72%

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

et al. 2017

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“…5a). The fit is completed using a series resistance, a R//CPE for the oxide oxidation reaction (OOR) at the SOEC electrode, and a finite length Warburg for the gas diffusion [50]. The values obtained for the artifact and the gas diffusion are kept for fitting the SOFC impedance diagram (Fig.…”

Section: Electrochemical Behaviour Of Lno Pno and Lp5no For One Montmentioning

confidence: 99%

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

Vibhu

Flura

Rougier

et al. 2020

Journal of Energy Chemistry

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The chemical and electrochemical stability of lanthanide nickelates La2NiO4+δ (LNO), Pr2NiO4+δ (PNO) and their mixed compounds La2-xPrxNiO4+δ (LPNOs) with x = 0.5, 1 or 1.5 is reported. The aim is to promote these materials as efficient electrodes for solid oxide fuel cell (SOFC) and/or solid oxide electrolysis cell (SOEC). La2NiO4+δ and La1.5Pr0.5NiO4+δ compounds are chemically very stable as powders over one month in the temperature range 600 − 800 °C, while the other materials rich in praseodymium progressively decompose into various perovskite-deriving components with additional Pr6O11. Despite their uneven properties, all these materials are quite efficient and sustainable as electrodes on top of gadolinium doped ceria (GDCBL) // yttrium doped zirconia (8YSZ) electrolyte, for one month at 700 °C without polarization. Under polarization (300 mA•cm-2), the electrochemical performances of LNO, PNO and La1.5Pr0.5NiO4+δ (LP5NO) quickly degrade in SOFC mode, i.e. for the oxygen reduction reaction, while they show durability in SOEC mode, i.e. for the oxide oxidation reaction.

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“…Data were fitted using the equivalent circuit model (ECM) technique with Zview® software (Scribner Associates Inc.). More details of the setup used to perform impedance measurements are provided in reference [42]. The 50:50 wt% mixtures of PrDC and P and PS cathode was grinded and calcined at 900°C for 3 h, then XRPD analysis was performed on the resulting powders.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

et al. 2020

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PrBa 2 Cu 3 O 6+δ (P) and PrBa 1.5 Sr 0.5 Cu 3 O 6+δ (PS) layered perovskite-type oxides are synthesized and characterized as oxygen electrodes in IT-SOFCs. The layered structure of P and PS compounds is constituted by the regular alternation along the crystallographic c axis of Pr O planes, Cu 2+ chains (CN = 4) and Cu 3+ pyramidal (CN = 5) layers. Interesting features of the PrBa 2 Cu 3 O 6+δ structure are the absence of cobalt, the presence of aliovalent cations and large amounts of oxygen vacancies. The substitution of 25% Ba with Sr is evaluated in order to improve the electronic conductivity of the undoped material. The compounds are synthesized via Citrate-Nitrate procedure and characterized by XRPD, 4-probe conductivity tests (100-800°C) and EIS measurements on symmetric cells in air varying the temperature (450-850°C). SEM images of post mortem cells are collected to evaluate the adhesion between components, layers thickness and particle morphology. Sr doping does not significantly improve the electrical conductivity but prompts a considerable hysteresis in the P sample between the cooling and the heating ramps. Conductivity values are lower than 100 S cm − 1 , but no electrical limitations are observed in EIS results. The introduction of a thin PrDC interlayer greatly reduces the Area Specific Resistances for both the compounds and the 0.15 Ω cm 2 target is almost fulfilled at 600°C (0.17 Ω cm 2 for PS + PrDC sample).

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Identification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ

Cited by 49 publications

References 21 publications

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

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Identification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ

Cited by 49 publications

References 21 publications

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr2CoNb1−xTixO6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr2CoNb1−xTixO6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

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Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells

Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr₂CoNb_1−xTi_xO_6−δ (0≤x≤1) as Cathode Materials for Solid Oxide Fuel Cells