Ionic conductivity of Mn2+ doped dense tin pyrophosphate electrolytes synthesized by a new co-precipitation method |
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| Affiliation: | 1. Ionics Lab, School of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwang-Ju 500-757, Republic of Korea;2. Research Institute for Catalysis, Chonnam National University, Republic of Korea;3. Department of Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea;1. UVHC, LMCPA EA 2443, F-59313 Valenciennes, France;2. Univ. Lille Nord de France, F-59000 Lille, France;3. ONERA Lille, F-59045 Lille, France;1. National Energy Technology Laboratory, U.S. Department of Energy, 3610 Collins Ferry Rd., Morgantown, WV 26507, United States;2. AECOM, Morgantown, WV 26507, United States;3. West Virginia University, Morgantown, WV 26506, United States;4. Louisiana State University, Baton Rouge, LA 70803, United States;1. Institute of Nanomaterial & Nanostructure, Changsha University of Science and Technology, Changsha 410114, China;2. College of Engineering and Applied Science, University of Wisconsin Milwaukee, Wisconsin 53211, USA;1. Department of Industrial Chemistry, Alagappa University, Karaikudi, India;2. Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea;3. Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 702-701, South Korea;1. Missouri University of Science and Technology, Department of Chemistry, 400W 11th Street, Rolla, MO, 65409, USA;2. Missouri University of Science and Technology, Department of Mechanical and Aerospace Engineering, Rolla, MO, 65409, USA;3. BK21 Plus, Division of Nano Convergence Technology, Pusan National University, Busan, 609735, South Korea |
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| Abstract: | Mn2+-doped Sn1−xMnxP2O7 (x = 0–0.2) are synthesized by a new co-precipitation method using tin(II)oxalate as tin(IV) precursor, which gives pure tin pyrophosphate at 300 °C, as all the reaction by-products are vaporizable at <150 °C. The dopant Mn2+ acts as a sintering aid and leads to dense Sn1−xMnxP2O7 samples on sintering at 1100 °C. Though conductivity of Sn1−xMnxP2O7 samples in the ambient atmosphere is 10−9–10−6 S cm−1 in 300–550 °C range, it increases significantly in humidified (water vapor pressure, pH2O = 0.12 atm) atmosphere and reaches >10−3 S cm−1 in 100–200 °C range. The maximum conductivity is shown by Sn0.88Mn0.12P2O7 with 9.79 × 10−6 S cm−1 at 550 °C in ambient air and 2.29 × 10−3 S cm−1 at 190 °C in humidified air. It is observed that the humidification of Sn1−xMnxP2O7 samples is a slow process and its rate increases at higher temperature. The stability of Sn1−xMnxP2O7 samples is analyzed. |
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| Keywords: | Tin pyrophosphate Proton conductivity Proton-conducting ceramic-electrolyte fuel cells Sintering-aid Co-precipitation method |
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