Effect of phase transformation of zirconia on the fracture behavior of electrolyte-supported solid oxide fuel cells |
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| Affiliation: | 1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Zhejiang 315201, PR China;2. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, PR China;3. Ningbo SOFCMAN Energy Technology Co., Ltd, Zhejiang 315105, PR China;1. School of Environmental and Safety Engineering, North University of China, People''s Republic of China;2. School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, People''s Republic of China;1. State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China;2. College of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University, Zhoushan, 316000, PR China;3. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA;4. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou, 310013, PR China;1. Department of Physics, Savitribai Phule Pune University, Pune, 411 007, India;2. Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600 036, India;1. J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic;2. Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic;1. Department of Chemistry, Shahid Beheshti University, Evin, 1983963113 Tehran, Iran;2. Gas Research Division, Research Institute of Petroleum Industry, 1485733111, Tehran, Iran;3. Catalysis Research Division, Research Institute of Petroleum Industry, Tehran, Iran |
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| Abstract: | Zirconia solid electrolyte provides the functions of mechanical support, electronic insulation and oxygen ions conductivity for electrolyte-supported solid oxide fuel cell. Ferritic stainless steel is used as current collector to study the structural stability of the two cells during the cooling process. The sample using fully-stabilized zirconia is cracked after the cooling process, while the partially-stabilized zirconia sample has no obvious changes. Thermal expansion coefficient of the two samples is similar, which exhibits that TEC is not the main factor to result in the fracture. In-situ X-ray diffraction results indicated that the conflict between the compression state in cell due to TEC and the volume expansion of the fully-stabilized zirconia sample due to phase transformation can cause cracking. Partially-stabilized zirconia sample can be transformed from tetragonal to cubic phase during the temperature rising, while can be recovered to its initial state during cooling. Even much more cubic phase can be transformed to the tetragonal phase induced by pressure stress during cooling, which plays an important role on the anti-cracking performance. |
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| Keywords: | Fracture Phase transformations Solid oxide fuel cell Tape casting Thermal expansion |
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