Electrochemical Formation of Thin Ceramic Mixed Conduction Membranes for Oxygen Separation

用于氧气分离的薄陶瓷混合导电膜的电化学形成

• 批准号: 9161276
• 负责人: Michael Schwartz
• 金额: $ 5万
• 依托单位: Eltron Research, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-15 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9161276&HistoricalAwards=false
• 关键词: Electrochemical; Formation; Thin; Ceramic; Mixed

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.//

该计划解决了开发用于在高温下实现可靠的氧分离的薄陶瓷膜的需求。将致力于开发常温电解技术，以制备用作氧分离膜的陶瓷混合离子和电子导体(MIEC)。这些膜将基于组成为Re1-xAxCo1-yByO3-a的钙钛矿(其中稀土金属(RE)选自La、ND、Sm、Gd、Dy、Er、Yb；A选自Ba、Sr，以及Ca和B选自Fe、Ni、Ag和Cu.这将首先通过将石墨和YSZ粉末混合，然后在惰性气氛(如Ar或N)下烧结来制备由碳和Yttria稳定的氧化锆(YSZ)制成的流延导电金属陶瓷。这种结构将用于两个目的：第一，它将提供导电衬底，在其上可以进行钙钛矿膜的电沉积；第二，通过在空气中将金属陶瓷和电沉积膜带到700-900摄氏度，石墨将燃烧殆尽，留下高度多孔的YSZ结构，其上支撑着钙钛矿膜。将测定以多孔YSZ为载体的MIEC膜在高温下分离大气氧的性能特征。