Microstructures and electrical properties of zirconium doped barium cerate perovskite proton conductors |
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| Affiliation: | 1. Department of Mechanical Engineering, National Central University, Taoyuan City, 32001, Taiwan;2. Institute of Materials Science and Engineering, National Central University, Taoyuan City, 32001, Taiwan;3. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu City, 30010, Taiwan;1. Department Mechanical Engineering, National Central University, Taoyuan City, 32001, Taiwan;2. Institute of Materials Science and Engineering, National Central University, Taoyuan City, 32001, Taiwan;3. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan;1. Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA;2. Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA;3. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;1. International Institute for Carbon-Neutral Energy Research (I2CNER-WPI), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Organization for the Promotion of Tenure Track, University of Miyazaki, 1-1 Gakuenkibanadai Nishi, 889-2192, Japan;3. Strategic Institute of Technology and Research Center Nippon Shokubai Co. LTD, 992-1 Nishioki, Himeji, Hyogo 671-1292, Japan;4. Next-Generation Fuel Cell Research Center (NEXT-FC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. Department of Physics, Shivaji University, Kolhapur, 416004, India;2. Department of Physics, Rajaram College, Kolhapur, 416004, India |
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| Abstract: | In this work, we vary the Zr to Ce ratio to investigate the microstructures and electrical properties of zirconium doped barium cerates. The solid state reaction is used in synthesizing the BaCe0.8-xZrxY0.2O3 (X = 0.1–0.5). The electron backscatter diffraction (EBSD) is successfully applied to identify the crystal structure of the barium cerates. EBSD results indicate that all samples have the orthorhombic structure. Conductivity measurement results show that for temperatures below 700 °C, Zr-doped barium cerates have higher protonic conductivities than oxygen-ion/electron-hole conductivities. The protonic conductivity increases with the Zr content initially, but decreases after the Zr content is higher than 0.3. The protonic conductivity of BCZY0.3 reaches 8.8 mS/cm at 700 °C in dry hydrogen atmosphere. Stability test results show that, for stable operation in CO2 atmosphere, the Zr content in barium cerates should be greater than 0.2. |
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| Keywords: | Perovskite Protonic conductivity Electrolyte Crystal structure Proton ceramic fuel cells |
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