Material transport and degradation behavior of SOFC interconnects |
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| Institution: | 1. New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea;2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;1. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, No. 62, Wencui Road, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, No. 96, JinZhai Road Baohe District, Hefei, Anhui, 230026, China;1. Department of Renewable Energy, Niroo Research Institute, P.O. Box: 1468613113, Tehran, Iran;2. Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland;3. Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Kashan, P.O. Box: 87317-51167, Kashan, Iran;1. Electronic Materials Module Team, Korea Institute of Ceramics Engineering & Technology, Seoul 153-801, Republic of Korea;2. Department of Ceramic Engineering, Inha University, Incheon 402-751, Republic of Korea;3. Department of Materials Science and Engineering, Nelsom Mandela African Institute of Science and Technology, Arusha, Tanzania |
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| Abstract: | The SOFC interconnect materials, both lanthanum chromite based oxides and Fe–Cr ferritic alloys, are discussed from the viewpoint of material transport which causes the degradation in conductivity or chemical stability. The controlling factors, such as effect of oxygen chemical potential gradient, interaction with other cell components, and surrounding gaseous atmospheres are evaluated. The role grain boundary is important in the transport of metal components in oxide materials such as lanthanum chromites, or oxide scales on alloy. The diffusivity of metal components in alloy is much faster, which causes the interdiffusion on nickel and chromium between alloy and anode current collector. The reaction of alloy and sealing materials would be more significant, since the chromium component in alloy easily reacts with alkaline earth components in sealing materials. The slight amount of water vapor in air may greatly enhance the chromium vaporization rate from chromium oxide (Cr2O3). |
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