Oxygen reduction reaction of PrBaCo2−xFexO5+δ compounds as H+-SOFC cathodes: correlation with physical properties

Grimaud, Alexis; Bassat, Jean‐Marc; Mauvy, Fabrice; Pollet, M.; Wattiaux, Alain; Marrony, Mathieu; Grenier, Jean‐Claude

doi:10.1039/c3ta13956e

Cited by 53 publications

(42 citation statements)

References 38 publications

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“…In addition, the R 1 contribution is in the range of 0.035–0.04 Ωcm 2 appearing at frequencies of ∼10–20 kHz. As previously observed by different authors, this process is attributed to charge transfer at the oxygen electrode/electrolyte interface2223. Furthermore, R 1 , the high frequency (HF) component, is not changing for both cells, confirming that this contribution is produced by the common Nd nickelate-YSZ oxygen electrode.…”

Section: Resultssupporting

confidence: 82%

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

Hanifi

Laguna‐Bercero

Sandhu

et al. 2016

Sci Rep

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In this study, the effects of calcination and milling of 8YSZ (8 mol% yttria stabilized zirconia) used in the nickel-YSZ anode on the performance of anode supported tubular fuel cells were investigated. For this purpose, two different types of cells were prepared based on a Ni-YSZ/YSZ/Nd2NiO4+δ-YSZ configuration. For the anode preparation, a suspension was prepared by mixing NiO and YSZ in a ratio of 65:35 wt% (Ni:YSZ 50:50 vol.%) with 30 vol.% graphite as the pore former. As received Tosoh YSZ or its calcined form (heated at 1500 °C for 3 hours) was used in the anode support as the YSZ source. Electrochemical results showed that optimization of the fuel electrode microstructure is essential for the optimal distribution of gas within the support of the cell, especially under electrolysis operation where the performance for an optimized cell (calcined YSZ) was enhanced by a factor of two. In comparison with a standard cell (containing as received YSZ), at 1.5 V and 800 °C the measured current density was −1380 mA cm−2 and −690 mA cm−2 for the cells containing calcined and as received YSZ, respectively. The present study suggests that the anode porosity for improved cell performance under SOEC is more critical than SOFC mode due to more complex gas diffusion under electrolysis mode where large amount of steam needs to be transfered into the cell.

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Section: Resultssupporting

confidence: 82%

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

Hanifi

Laguna‐Bercero

Sandhu

et al. 2016

Sci Rep

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“…Layered double perovskite materials with the general formula LnBaM 2 O 5+δ (Ln = lanthanide or Y; M = transition metal) have been studied as potential electrodes for both PCFC [15,16,17,18] and SOFC due to their outstanding mixed electronic and oxide-ion conductivities [19,20]. Ln and Ba occupy the A-site in this double perovskite AA′B 2 O 6 -type crystal structure, while M occupies the B-site.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

et al. 2018

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The effect of A-site cation ordering on the cathode performance and chemical stability of A-site cation ordered LaBaCo2O5+δ and disordered La0.5Ba0.5CoO3−δ materials are reported. Symmetric half-cells with a proton-conducting BaZr0.9Y0.1O3−δ electrolyte were prepared by ceramic processing, and good chemical compatibility of the materials was demonstrated. Both A-site ordered LaBaCo2O5+δ and A-site disordered La0.5Ba0.5CoO3−δ yield excellent cathode performance with Area Specific Resistances as low as 7.4 and 11.5 Ω·cm2 at 400 °C and 0.16 and 0.32 Ω·cm2 at 600 °C in 3% humidified synthetic air respectively. The oxygen vacancy concentration, electrical conductivity, basicity of cations and crystal structure were evaluated to rationalize the electrochemical performance of the two materials. The combination of high-basicity elements and high electrical conductivity as well as sufficient oxygen vacancy concentration explains the excellent performance of both LaBaCo2O5+δ and La0.5Ba0.5CoO3−δ materials at high temperatures. At lower temperatures, oxygen-deficiency in both materials is greatly reduced, leading to decreased performance despite the high basicity and electrical conductivity. A-site cation ordering leads to a higher oxygen vacancy concentration, which explains the better performance of LaBaCo2O5+δ. Finally, the more pronounced oxygen deficiency of the cation ordered polymorph and the lower chemical stability at reducing conditions were confirmed by coulometric titration.

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“…Another possible way for developing high-performance air electrode materials is to explore the occurrence of proton conductivity in existing air electrode materials. For example, it has been reported that Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 − δ , PrBaCo 2 O 5+ δ , and Pr 2 NiO 4+ δ , known as mixed oxygen-ion and electronic conductors, possess also protonic conductivity [51,52]. This has been inferred not from direct protonic conduction measurements, but from the hydration capability of these materials, suggesting a potential protonic conduction.…”

Section: Electrode Materialsmentioning

confidence: 92%

Reversible solid oxide fuel cells (R-SOFCs) with chemically stable proton-conducting oxides

Boulfrad

Traversa

2015

Solid State Ionics

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Oxygen reduction reaction of PrBaCo2−xFexO5+δ compounds as H+-SOFC cathodes: correlation with physical properties

Cited by 53 publications

References 38 publications

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

Reversible solid oxide fuel cells (R-SOFCs) with chemically stable proton-conducting oxides

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