Negative expansion material compounded cobalt-based perovskite material, preparation method and solid oxide fuel cell

Abstract

The invention relates to a negative expansion material compounded cobalt-based perovskite material, a preparation method and a solid oxide fuel cell, and belongs to the technical field of fuel cells. According to the invention, the negative expansion material is introduced into the cobalt-based perovskite oxide, so that the SOFC cathode material with good electrochemical performance and low thermal expansion is successfully prepared. A composite electrode achieves good mechanical tolerance in the SOFC, the volume change in the whole sintering process can be relieved, the composite electrode is stably transited to a high-temperature stage, the TEC of the composite electrode is only 12.9 * 10 <-6 > K <-1 >, and the composite electrode is completely matched with an SDC electrolyte; in addition, the composite material shows good ORR activity and TEC value, and meanwhile, the CO2 poisoning resistance of the composite material is very excellent.

Description

technical field [0001] The invention relates to a cobalt-based perovskite material compounded with negative expansion materials, a preparation method and a solid oxide fuel cell, belonging to the technical field of fuel cells. Background technique [0002] Although SOFC has great commercial application prospects, as far as the current situation is concerned, the cost of manufacturing and using SOFC is too high to meet the requirements of commercialization, and the high operating temperature is the key factor causing the high cost. And the high operating temperature also limits the application of SOFC in portable devices, thus losing the mass market. Therefore, reducing the battery operating temperature is the development trend of SOFC. The development of medium and low temperature SOFC, lowering the operating temperature, can significantly improve the thermal cycle stability, and at the same time, it can use cheap connector materials, reduce the manufacturing cost of the ba...

AI Technical Summary

Problems solved by technology

When discussing the operation stability (durability) of fuel cells, for perovskite oxide cathode materials, the thermal expansion coefficient is one of the important parameters to measure the practical application value of materials, and the working temperature of medium and low temperature SOFC cells is roughly 500- Around 700°C, the electrode material, electrolyte and connector will experience different degrees of volume expansion in this temperature range, because the stress caused by the mismatch of thermal expansion coefficient will cause the electrode to fall off from the electrolyte, and the battery will deform, leak or even crack, which will seriously affect the battery. Life and work safety, stability

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