Electrical characterization of co-precipitated LaBaCo2O5+δ and YBaCo2O5+δ oxides |
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| Affiliation: | 1. Politecnico di Milano, Dipartimento di Chimica Materiali e Ingegneria Chimica “G. Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;2. Politecnico di Milano, Dipartimento di Energia, Via Lambruschini 4, 20156 Milano, Italy;3. INSTM R.U. and Università di Bergamo, Dipartimento di Ingegneria, Viale Marconi 5, 24044 Dalmine, BG, Italy;1. Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Av. Bustillo 9500, 8400, S.C. de Bariloche, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina;3. Instituto de Física Del Sur (IFISUR), Departamento de Física Universidad Del Sur. Av Alem 1253, Bahía Blanca 8000, Argentina;4. Y-TEC, YPF – TECNOLOGIA, Av. Del Petróleo S/n Entre 128 y 143, 1923, Berisso, Buenos Aires, Argentina;1. College of Materials Science and Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, Jiangsu, 210009, PR China;2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore;1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, PR China;2. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, PR China;1. Anhui Key Laboratory of Low Temperature Co-fired Materials, Department of Chemistry and Engineering, Huainan Normal University, Huainan 232001, China;2. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China |
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| Abstract: | REBaCo2O5+δ layered perovskite oxides (RE = Rare Earth) are promising cathodes for IT-SOFCs. In this work, a simple co-precipitation synthesis in aqueous medium was applied to prepare LaBaCo2O5+δ (LBC) and YBaCo2O5+δ (YBC) cathodes. The chemical and electrochemical properties of both materials were characterized via XRD, SEM, TPO, TG–DTA, 4-probe conductivity measurement, and EIS tests on symmetric cells. The coprecipitation synthesis revealed a promising preparation route: the measured ASR values of both materials were well comparable with the literature ones. A kinetic investigation of the O2 reduction process was performed on LBC (600–800 °C, 5–100% O2, v/v), whose results were analyzed with equivalent circuits. The main steps were identified (oxygen diffusion and charge transfer at high frequency, O2 chemisorption at medium frequency), and their activation energy and reaction order were quantified. Aging tests (500 h time on stream, 500–800 °C) revealed quick deactivation for YBC and good stability for LBC. |
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| Keywords: | Co-precipitation LBC YBC IT-SOFC EIS |
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