Thermodynamic analysis and experimental study of electrode reactions and open circuit voltages for methane-fuelled SOFC |
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| Affiliation: | 1. Shandong University of Science and Technology, 579 Qianwangang Road, Qingdao, 266590, PR China;2. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, PR China;3. Marine Engineering College, Dalian Maritime University, Dalian, 116026, PR China;1. Department of Electrical Engineering, COMSATS University, Islamabad, 44000, Pakistan;2. Department of Physics, COMSATS University Islamabad, Lahore Campus, 54000, Pakistan;3. Department of Energy Technology, Royal Institute of Technology (KTH), 10044, Stockholm, Sweden;4. Department of Physics, University of Okara, Okara, 56300, Pakistan;1. Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan, 030006, PR China;2. College of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong, 030619, PR China;3. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, NO.30 Puzhu Road(S), Nanjing, 211816, PR China;4. Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan, 030006, PR China;5. Department of Chemical Engineering, Curtin University, Perth, WA, 6845, Australia;1. Key Laboratory of Gas and Fire Control for Coal Mines (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;3. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;4. Department of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China;1. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China;2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208, United States;3. Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Lab of Material Processing and Die & Mound Technology, Huazhong University of Science and Technology, Wuhan, 430074, China |
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| Abstract: | Natural gas is one of the most important fuels for solid oxide fuel cell (SOFC). The relationships among the reactions of methane over the nickel-based anode, fuel compositions, carbon deposition, electromotive force (EMF) and open circuit voltage (OCV) of SOFC are investigated in this work. With the increase of temperature, EMF and OCV of SOFC decrease gradually when the cell uses humidified hydrogen as fuel. Reactivity of methane increases gradually with the increase of temperature, which can affect the EMF and OCV of SOFC. When the humidified mixture of nitrogen and methane is used as the fuel, the EMF and OCV of SOFC increase gradually with the increase of temperature. EMF and OCV of SOFC with humidified mixture of hydrogen and methane (MCH4: MH2: MH2O = 12.2: 85.3: 2.5) as fuel decrease gradually with the increase of temperature when the temperature is lower than 873 K, which is similar to that with humidified hydrogen as fuel. While when the temperature is higher than 923 K, the EMF and OCV of SOFC with humidified mixture of hydrogen and methane as fuel increase gradually with the increase of temperature, which is similar to that with humidified mixture of nitrogen and methane as fuel. OCV of SOFC is mainly affected by thermodynamic equilibriums for methane-fuelled SOFC when the anode activity is high enough, which is close to the EMF calculated according to the thermodynamic equilibriums. While with the increase of carbon deposition, the anode activity decreases apparently and the OCV of SOFC also decreases apparently, which shows that the OCV is affected by the anode activity for methane-fuelled SOFC when the anode activity is low. |
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| Keywords: | Solid oxide fuel cell Ni-YSZ anode Electromotive force Open circuit voltage Carbon deposition |
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