固体氧化物燃料电池合金连接体尖晶石保护涂层研究进展

Research Progress of Spinel Protective Coatings on Alloy Interconnects for Solid Oxide Fuel Cells

Fe-Cr基合金连接体是固体氧化物燃料电池组堆的重要组件,但其在600~800℃工作时易被氧化,致使导电性能下降且“Cr中毒”问题突出。目前,主要的解决方法是在Fe-Cr基合金连接体上的表面涂覆保护涂层以减小固体氧化物燃料电池组堆性能的降低。尖晶石涂层因其良好的抗氧化性能、导电性能及适宜的热膨胀系数,在合金连接体保护涂层中得到广泛应用。阐述了近年来不同尖晶石涂层体系的研究进展,介绍了尖晶石涂层的制备方法,并指出了该领域今后的发展方向。

Fe-Cr based alloy interconnects were the important components of solid oxide fuel cells（SOFCs）. However, the Fe-Cr interconnects were easy to be oxidized at the operating temperature of 600-800 ℃, which can lead to the poor conductive performance and potential chromium（Cr） poisoning. Recently, the surface modification with protective coatings on Fe-Cr interconnect was found to be effective in reducing the performance degradation of SOFCs. The spinel coating was widely used in the protective coating of Fe-Cr interconnects due to its excellent oxidation resistance, conductive properties and suitable thermal expansion coefficient. The research progress of different spinel coating systems were reviewed. The preparation methods of spinel coating were introduced, and the development direction of the field in the future was proposed.