Electrochemical Formation of Thin Ceramic Mixed Conduction Membranes for Oxygen Separation

该计划解决了在高温下实现可靠氧分离的薄陶瓷膜的开发需求。技术上的努力将朝向开发用于制备用作氧分离膜的离子和电子混合薄膜陶瓷导体（MIEC）的常温电解技术。这些膜将基于RE1-xAxCo 1-yByO3-a组成的钙钛矿(其中稀土金属（RE）将从La， Nd, Sm, Gd, Dy, Er， Yb中选择；A来自Ba， Sr和Ca， B来自Fe， Ni， Ag和Cu。这将首先通过混合石墨和YSZ粉末制备碳和钇稳定氧化锆（YSZ）的带铸导电金属陶瓷，然后在惰性气氛（如氩气或氮气）下将混合物烧结。这种结构有两个目的：首先，它将提供一个导电衬底，在上面可以进行钙钛矿薄膜的电沉积；其次，通过将金属陶瓷和电沉积薄膜在空气中加热到700-900摄氏度，石墨将燃烧殆尽，留下一个高度多孔的YSZ结构，在上面支撑钙钛矿薄膜。研究了多孔YSZ支撑的MIEC膜在高温下分离大气氧的性能

This program addresses the need for development of thin ceramic membranes for achieving reliable oxygen separation at elevated temperatures. Technical effort will be directed towards development of ambient temperature electrolytic technique for the preparation of thin film ceramic mixed ionic and electronic conductors (MIEC) for use as oxygen separation membranes. These membranes will be based on perovskites of compositions RE1-xAxCo 1-yByO3-a (where the rare earth metal (RE) will be selected from La, Nd, Sm, Gd, Dy, Er, Yb; A from Ba, Sr, and Ca and B from Fe, Ni, Ag and Cu. This will be performed by initially preparing a tape cast conductive cermet of carbon and yttria stabilized zirconia (YSZ) by mixing graphite and YSZ powder followed by sintering the mixture under an inert atmosphere such as argon or nitrogen. This structure will serve two purposes: first it will provide a conductive substrate onto which electrodeposition of pervskite films can be performed, and secondly by taking the cermet and electrodeposited film up to 700-900 degrees celsius under air the graphite will burn out leaving a highly porous YSZ structure onto which the pervskite film is supported. The performance characteristics of MIEC membranes supported on porous YSZ for separation of atmospheric oxygen at elevated temperatures will be determined.//