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3934 |
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The effect of samarium oxide on electrical conductivity of plasma sprayed SOFC anode |
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Hamed Samadi* / Dept. of Materials Science and Engineering, Science and Research Branch, Islamic Azad University, Iran Sara Nikkho Panahi / Dept. of Materials Science and Engineering, Science and Research Branch, Islamic Azad University, Iran Ali Nemati/ Dept. of Materials Science and Engineering, Sharif University of Technology, Iran |
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Because of their higher energy efficiency, solid oxide fuel cells (SOFCs) are considered as one of the new energy conversion systems. These systems are going to be put into practice more, from clean energy producing and environmentally friendly technology point of view. Recently, the anodes of SOFCs are being studied in depth. Examinations have indicated that anodes based on perovskite structure are a more promising candidate in SOFCs. Among perovskite-type oxides, SrTiO3 is one of the most hope-giving compositions. It has been studied as the anode in SOFCs as doped SrTiO3 possesses good electrical properties. The main purpose of this paper is studying the effect of rare-earth dopant in perovskite structure on electrical behavior of anode in SOFCs. Sm2O3 doped SrTiO3 synthesized by solid state reaction was coated on substrate by atmospheric plasma spray (APS). In order to compare the effect of dopant on electrical conductivity of strontium titanate, different concentrations of Sm2O3 were used. The samples were then investigated by XRD, Four-point probe at various temperatures (to determine the electrical conductivity) and SEM. It is shown that at room temperature, undoped sample has a higher electrical resistance and the electrical resistance decreases with dopant addition. Increasing the temperature increases the electrical conductivity. The results were correlated to the XRD and SEM data and an optimum value was found. |