Perovskite SrFe1-xTixO3-δ (x?<?= 0.1) cathode for low temperature solid oxide fuel cell |
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Authors: | Naveed Mushtaq Chen Xia Wenjing Dong G Abbas Rizwan Raza Amjad Ali Sajid Rauf Baoyuan Wang Jung-Sik Kim Bin Zhu |
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Affiliation: | 1. Hubei Collaborative Innovation Center for Advanced Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei 430062, PR China;2. Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan;3. Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;4. Department of Energy Technology, Royal Institute of Technology, Stockholm SE-10044, Sweden;5. School of Aeronautical & Automotive Engineering, Loughborough University, Loughborough LE113TU, United Kingdom |
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Abstract: | Stable and compatible cathode materials are a key factor for realizing the low-temperature (LT, ≤600?°C) operation and practical implementations of solid oxide fuel cells (SOFCs). In this study, perovskite oxides SrFe1-xTixO3-δ (x?< = 0.1), with various ratios of Ti doping, are prepared by a sol-gel method for cathode material for LT-SOFCs. The structure, morphology and thermo-gravimetric characteristics of the resultant SFT powders are investigated. It is found that the Ti is successfully doped into SrFeO3-δ to form a single phase cubic perovskite structure and crystal structure of SFT shows better stability than SrFeO3-δ. The dc electrical conductivity and electrochemical properties of SFT are measured and analysed by four-probe and electrochemical impedance spectra (EIS) measurements, respectively. The obtained SFT exhibits a very low polarization resistance (Rp), .01 Ωcm2 at 600?C. The SFT powders using as cathode in fuel cell devices, exhibit maximum power density of 551?mW?cm?2 with open circuit voltage (OCV) of 1.15?V at 600?C. The good performance of the SFT cathode indicates a high rate of oxygen diffusion through the material at cathode. By enabling operation at low temperatures, SFT cathodes may result in a practical implementation of SOFCs. |
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Keywords: | LT-SOFCs Perovskite cathode Material stability Low polarization resistance Power density |
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