Transport properties and electrochemical activity of YBa(Co,Fe)4O7 cathodes |
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| Affiliation: | 1. Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Department of Energy Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;1. Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autonoma del Estado de Morelos, Cuernavaca, Mexico;2. Unidad Querétaro del Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Querétaro, Mexico;3. Centro de Investigaciones Quimicas, Universidad Autonoma del Estado de Morelos, Cuernavaca, Mexico;4. Facultad de Ciencias Químicas e Ingeniería, Universidad Autonoma del Estado de Morelos, Cuernavaca, Mexico;1. Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, UK;2. EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;1. Academy of Scientific and Innovative Research (AcSIR), CSIR—National Institute for Interdisciplinary Science and Technology (CSIR-NIIST) Campus, Trivandrum 695 019, India;2. Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum 695 019, India;3. Materials Research Laboratory, University of Nova Gorica, Nova Gorica 5000, Slovenia;4. Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076, India;1. Syktyvkar State University, Oktjabrskij prospect, 55, Syktyvkar, Republic of Komi 167001, Russia;2. St. Petersburg State University, Universitetsky pr. 26, St. Petersburg 198504, Russia;3. Institute of Chemistry of the Komi Science Center UB RAS, Pervomaiskaya st. 48, Syktyvkar, Republic of Komi 167982, Russia;4. Institute of Geology of the Komi Science Center UB RAS, Pervomaiskaya st. 54, Syktyvkar, Republic of Komi 167982, Russia;5. University of Illinois at Chicago, 845 W. Taylor St., MC 111, Chicago, IL 60607, USA |
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| Abstract: | The layered phases derived from YBaCo4O7 exhibit a relatively low thermal expansion, significant mixed conductivity and attractive electrochemical activity in contact with doped LaGaO3 solid electrolyte. These properties may be of interest for intermediate-temperature SOFC cathodes. Moderate doping of yttrium-barium cobaltite with iron decreases slightly the total conductivity, predominantly p-type electronic, and have no essential effect on the oxygen ion transport and cathodic polarization at 1073 K. However, hexagonal YBaCo4O7, where the average cobalt oxidation state is + 2.25, and its derivatives appear metastable at temperatures below 1050–1100 K. Oxygen uptake at intermediate temperatures in air leads to the phase decomposition, accompanied by increasing conductivity and dramatic volume contraction. |
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