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Materials 2018, 11(2), 196; doi:10.3390/ma11020196

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

1
Department of Material Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
2
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai 980-8577, Japan
3
Department of Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USA
4
Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA
Current address: AB Sandvik Materials and Technology, R&D, 81181 Sandviken, Sweden.
*
Author to whom correspondence should be addressed.
Received: 28 December 2017 / Revised: 19 January 2018 / Accepted: 24 January 2018 / Published: 26 January 2018
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [3487 KB, uploaded 30 January 2018]   |  

Abstract

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. View Full-Text
Keywords: proton ceramic fuel cells (PCFC); cathode; layered double perovskite proton ceramic fuel cells (PCFC); cathode; layered double perovskite
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MDPI and ACS Style

Bernuy-Lopez, C.; Rioja-Monllor, L.; Nakamura, T.; Ricote, S.; O’Hayre, R.; Amezawa, K.; Einarsrud, M.-A.; Grande, T. Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes. Materials 2018, 11, 196.

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