SBIR Phase II: Novel Oxygen Anion Conducting Solid Electrolytes

这个小型企业创新研究(SBIR)第二阶段项目是针对新一代氧阴离子导电固体电解质的制备和性能评估。这些源自褐磨石固态结构的新材料之所以被选中，是因为它们具有比目前技术上可用的材料更高的氧阴离子导电性和化学稳定性的近期潜力。该计划中出现的技术将提高以下方面的性能：(1)电驱动大气氧分离；(2)中温固体氧化物燃料电池(SOFC)；以及(3)快速响应化学传感器，仅举几个例子。电解氧分离和SOFC技术都将通过降低目前因使用氧化钇稳定的氧化锆(YSZ)固体电解质而导致的操作温度过高而产生的严峻的材料硬件限制，使其在经济上更具竞争力。基于这种先进的固体电解质的中温电化学设备还将具有额外的优势，即需要更便宜的硬件组件来实现其商业实施。在该计划的这一阶段，工作已经确定了具有：(1)在同时氧化和还原条件下具有良好的化学稳定性；(2)微不足道的寄生电子导电性；以及(3)从直流测量中获得的氧阴离子导电率大约是YSZ的两倍，代表了电化学设备中预期的那些条件。本计划中所进行的工作将导致澄清新一代的氧阴离子导电电解质，这些电解质有望在中温电化学设备中获得商业应用，如电解氧发生器、燃料电池和化学传感器。

This Small Business Innovation Research (SBIR) Phase II project is directed toward the fabrication and performance evaluation of a new generation of oxygen anion conducting solid electrolytes. These new materials, derived from the brownmillerite solid state structure, are being selected because of their near term potential for achieving higher oxygen anion conductivity and chemical stability than currently technically available materials. Technology emerging in this program will enable improved performance for: (1) electrically driven atmospheric oxygen separation; (2) intermediate temperature Solid Oxide Fuel Cells (SOFCs); and, (3) fast response chemical sensors, to give but a few examples. Both electrolytic oxygen separation and SOFC technology will be made economically more competitive by lowering present severe materials hardware constraints resulting from high operating temperatures associated with the use of Yttria Stabilized Zirconia (YSZ) solid electrolyte. Moderate temperature electrochemical devices based upon such advanced solid electrolytes will also have the added advantage of requiring less expensive hardware components for their commercial implementation. Work to this stage in the program has identified oxygen anion conducting solid electrolytes which possess: (1) excellent chemical stability under simultaneous oxidizing and reducing conditions; (2) insignificant parasitic electronic conductivity; and, (3) an oxygen anion conductivity approximately twice that of YSZ from DC measurements, representative of those conditions anticipated in electrochemical devices.Work being performed in this program will result in clarifying a new generation of oxygen anion conducting electrolytes which are anticipated to find commercial application in intermediate temperature electrochemical devices, such as electrolytic oxygen generators, fuel cells, and chemical sensors.