High oxide ion conductivity in Fe and Mg doped LaGaO3 as the electrolyte of solid oxide fuel cells |
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| Institution: | 1. Department of Hydrogen Energy Systems, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. International Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. Next-Generation Fuel Cell Research Center (NEXT-FC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;4. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. Department of Physics, Government General Degree College, Salboni, Paschim Medinipur, 721516, India;2. Department of Physics, The University of Burdwan, Burdwan, 713104, India;1. Tecnológico Nacional de México, Instituto Tecnológico de Saltillo, 25280, Saltillo, Coahuila, Mexico;2. CIQA, Enrique Reyna Hermosillo 140, 25294, Saltillo, Coahuila, Mexico;3. COMIMSA-Conacyt, Ciencia y Tecnología 790, 25290, Saltillo, Coahuila, Mexico;4. CINVESTAV Unidad Saltillo, Av. Industria Metalúrgica 1062, 25900, Ramos Arizpe, Coahuila, Mexico;5. INEEL, Reforma 113, 62490, Cuernavaca, Morelos, Mexico |
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| Abstract: | La(Sr)Ga(Fe,Mg)O3 exhibited the high oxide ion conductivity and the electrical power generating property of SOFC single cell using La0.7Sr0.3Ga0.7Fe0.2Mg0.1O3-δ (LSGFM) electrolyte was investigated in this study. The transport number of oxide ion is almost 0.8 in LSGFM and so open circuit potential (OCV) is as low as 0.8 V. OCV was strongly affected by anode materials and the highest OCV was achieved on Ni–Fe bimetallic anode. The extremely high power density was achieved by using LSGFM for electrolyte of SOFC. The maximum power densities of the cells can be elevated by coating with oxide ion conductor film at anode side. The maximum power density increased in the following order for coating film: LSGM > SDC > YSZ. The maximum power density of 197 and 100 mW/cm2 can be achieved at 873 and 773 K, respectively, when LSGM film deposited on the anode side of LSGFM. Therefore, LSGFM can be used as electrolyte of SOFC operating at intermediate temperature. |
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