大气等离子喷涂固体氧化物燃料电池用低温阴极材料

Atmospheric Plasma Spraying(APS)Low-Temperature Cathode Materials for Solid Oxide Fuel Cells(SOFCs)

大气等离子喷涂由于能够快速制备具有可控微结构的功能涂层,在固体氧化物燃料电池(SOFCs)制造中具有广阔的应用前景。该技术使得低温运行(500～700℃)的SOFCs可通过在耐用低成本金属支撑体上直接喷涂得以制备。不过,目前商业应用的SOFCs所使用的标准阴极材料在较低运行温度下具有很高的极化电阻,因此,开发可替代的高性能低温阴极材料是推动金属支撑体应用的关键。在不锈钢基材上通过轴向注入大气等离子喷涂方法制备了镧锶钴铁氧化物(LSCF)涂层,并对涂层的厚度和微观结构进行了表征,同时采用X射线衍射(XRD)方法分析了等离子喷涂过程中涂层材料的分解和杂质相的产生。根据这些结果确定了能够制备LSCF涂层的等离子喷涂参数,以及可用于喷涂复合阴极涂层的条件范围。

Atmospheric plasma spraying is attractive for manufacturing solid oxide fuel cells （SOFCs） because it allows functional layers to be built rapidly with controlled microstructures. The technique allows SOFCs that operate at low temperatures （500℃ to 700℃） to be fabricated by spraying directly onto robust and inexpensive metallic supports. However, standard cathode materials used in commercial SOFCs exhibit high polarization resistances at low operating temperatures. Therefore, alternative cathode materials with high performance at low temperatures are essential to facilitate the use of metallic supports. Coatings of lanthanum strontium cobalt fenite （LSCF） were fabricated on steel substrates using axial-injection atmospheric plasma spraying. The thickness and microstructure of the coating layers were evaluated and X-ray diffraction （XRD） analysis was performed on the coatings to detect material decomposition and the formation of undesired phases in the plasma. These results determined the envelope of plasma spray parameters in which coatings of LSCF can be manufactured, and the range of conditions in which composite cathode coatings could potentially be manufactured.