Control of Co content and SOFC cathode performance in Y1−ySr2+yCu3−xCoxO7+δ |
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| Institution: | 1. Computational Chemistry Center for Nanotechnology and Department of Chemistry, Faculty of Science and Technology, Rajabhat Maha Sarakham University, Maha Sarakham 44000, Thailand;2. Center of Excellence for Innovation in Chemistry and Supramolecular Chemistry Research Unit, Department of Chemistry, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand;1. Advanced Materials Laboratory (AML), Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran;2. Magnet Research Laboratory (MRL), Department of Physics, Sharif University of Technology, P.O. Box 11365-916, Tehran, Iran;1. Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place Louis Pasteur 1, 1348 Louvain-la-Neuve, Belgium;2. Laboratoire de Génie chimique-Nanomatériaux, Catalyse, Electrochimie, Université de Liège, Institut de Chimie, B6a, Sart-Tilman, B-4000 Liège, Belgium;3. Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium;1. Physics Department, V. Karazin Kharkiv National University, 61022 Kharkiv, Ukraine;2. Physikalisches Institut, Goethe University, 60438 Frankfurt am Main, Germany;3. IPA Instituto Superior Autonomo de Estudos Politecnicos, 1900-440 Lisboa, Portugal |
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| Abstract: | The electrochemical performance of the layered perovskite YSr2Cu3−xCoxO7+δ, a potential solid oxide fuel cell (SOFC) cathode, is improved by increasing the Co content from x = 1.00 to a maximum of x = 1.30. Single phase samples with x > 1.00 are obtained by tuning the Y/Sr ratio, yielding the composition Y1−ySr2+yCu3−xCoxO7+δ (where y ≤ 0.05). The high temperature structure of Y0.95Sr2.05Cu1.7Co1.3O7+δ at 740 °C is characterised by powder neutron diffraction and the potential of this Co-enriched material as a SOFC cathode is investigated by combining AC impedance spectroscopy, four-probe DC conductivity and powder XRD measurements to determine its electrochemical properties along with its thermal stability and compatibility with a range of commercially available electrolytes. The material is shown to be compatible with doped ceria electrolytes at 900 °C. |
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| Keywords: | Mixed ionic-electronic conductor Solid oxide fuel cell Cathode Perovskite |
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