Gd- and Pr-based double perovskite cobaltites as oxygen electrodes for proton ceramic fuel cells and electrolyser cells / Strandbakke R., Cherepanov V.A., Zuev A.Y., Tsvetkov D.S., Argirusis C., Sourkouni G., Prünte S., Norby T. // Solid State Ionics. - 2015. - V. 278, l. . - P. 120-132.

ISSN:

01672738

Type:

Article

Abstract:

Double perovskite oxides BaGd0.8La0.2Co2O6-δ (BGLC), BaGdCo1.8Fe0.2O6-δ (BGCF), BaPrCo2O6-δ (BPC) and BaPrCo1.4Fe0.6O6-δ (BPCF) were investigated as oxygen electrodes on mixed conducting BaZr0.7Ce0.2Y0.1O3 (BZCY72) electrolyte using impedance spectroscopy vs temperature, pO2, and pH2O. We propose and have applied a novel approach to extract and parameterise the charge transfer and diffusion impedances of the electrode reactions in a system comprising charge transport of protons, oxide ions, and electrons. Given by the properties of the BZCY72, transport of protons dominates at lower temperatures and high pH2O, oxide ions at higher temperatures, and electron holes increasingly at high temperatures and high pO2. The electrodes showed good performance, with the lowest total apparent polarisation resistance for BGLC/BZCY72 being 0.05 and 10 Ωcm2 at 650 and 350 °C, respectively. The low temperature rate limiting reaction step is a surface related process, involving protonic species, with an activation energy of approximately 50 kJ mol-1 for BGLC/BZCY72. The oxide ion transport taking over at higher temperatures exhibits a higher activation energy typical of SOFC cathodes. Thermogravimetric studies revealed that BGLC exhibits considerable protonation at 300-400 °C, which may be interpreted as hydration with an enthalpy of approximately -50 kJ mol-1. The resulting mixed proton electron conduction may explain its good performance as electrode on BZCY72. © 2015 Elsevier B.V. All rights reserved.

Author keywords:

Double perovskite; Mixed conductivity; P-MIEC; PCEC; PCFC; Proton conductor

Index keywords:

Activation energy; Charge transfer; Chemical activation; Fuel cells; Ions; Perovskite; Protonic ceramic fuel cells (PCFC); Solid oxide fuel cells (SOFC); Surface reactions; Double perovskite oxide; Do

DOI:

10.1016/j.ssi.2015.05.014

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934953300&doi=10.1016%2fj.ssi.2015.05.014&partnerID=40&md5=b7c38e5f90acc218b8e6df4109da8b45

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934953300&doi=10.1016%2fj.ssi.2015.05.014&partnerID=40&md5=b7c38e5f90acc218b8e6df4109da8b45
Affiliations	Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, Oslo, Norway; Department of Chemistry, Ural Federal University, Yekaterinburg, Russian Federation; School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechneiou, Zographou, Athens, Greece; TU Clausthal, Institut für Elektrische Energietechnik und Energiesysteme, Leibnizstraße 28, Clausthal-Zell, Germany; Energie-Forschungszentrum Niedersachsen (EFZN), Am Stollen 19, Goslar, Germany
Author Keywords	Double perovskite; Mixed conductivity; P-MIEC; PCEC; PCFC; Proton conductor
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Correspondence Address	Strandbakke, R.; Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, Norway
Publisher	Elsevier
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus