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Fabrication of anode-supported thin BCZY electrolyte protonic fuel cells using NiO sintering aid
Affiliation:1. Institute of Materials Science and Engineering, National Central University, Taoyuan City, 32001, Taiwan, ROC;2. Department of Mechanical Engineering, National Central University, Taoyuan City, 32001, Taiwan, ROC;3. Department of Materials Science and Engineering, National Chiao Tung University, Hischu, 30010, Taiwan, ROC;4. Department of Chemical and Materials Engineering, National Central University, Taoyuan City, 32001, Taiwan, ROC;1. CNEA-CONICET, Centro Atómico Bariloche, Av. Bustillo 9500, S. C. de Bariloche, Rio Negro, 8400, Argentina;2. Departamento de Física, Universidad Nacional de Sur, and Instituto de Física, CONICET, Alem 1253, Bahía Blanca, 8000, Argentina;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. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. Narutowicza 11/12,Gdansk 80-233, Poland;2. Faculty of Electronics, Telecommunication and Informatics, Gdansk University of Technology, ul. Narutowicza 11/12, Gdansk 80-233, Poland;1. Institute of Science and Technology for Ceramics, National Council of Research (ISTEC-CNR), Via Granarolo 64, 48018, Faenza, Italy;2. Department of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, 44122, Ferrara, Italy;1. Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Department of Fuel Cells and Hydrogen Technology, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea
Abstract:A thin and fully dense BaCe0.6Zr0.2Y0.2O3-δ (BCZY) electrolyte for the use of anode-supported protonic fuel cells has been successfully prepared by spin coating using NiO sintering aid. The effects of NiO addition on the electrolyte microstructures and fuel cell performances are also investigated. An appropriate NiO addition has a significant positive contribution to the densification and grain growth of thin BCZY electrolytes. However, too much NiO addition gives rise to NiO aggregation in BCZY electrolyte and deteriorates the cell performance. The enhanced sintering mechanism can be mainly attributed to the oxygen vacancies generated from the NiO decomposition and bulk diffusion of Ni into BCZY perovskites. The fuel cell with a BCZY-3%NiO electrolyte exhibits the highest maximum power density of ~106.6 mW/cm2 at 800 °C among all fuel cells in this study. The electrochemical impedance characteristics of thin BCZY electrolyte fuel cells are further discussed under open circuit conditions.
Keywords:Solid oxide fuel cells  Proton-conducting electrolyte  Sintering aid  Spin coating  Electrochemical impedance spectroscopy
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