Chromium-Related Degradation of Thin-Film Electrolyte Solid Oxide Fuel Cell Stacks. (2nd June 2015)

• Record Type: Journal Article
• Authors: Menzler, Norbert H.; Sebold, Doris; Fang, Qingping
• Is Part Of: ECS transactions. Volume 68:Number 1(2015)
• Page Start: 1815
• Page End: 1825
• Publication Date: 2015-06-02
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06801.1815ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : SOFC short stacks with thin-film electrolyte anode-supported cells were operated for up to ~ 3, 000 h and post-test characterized. The cells consisted of thin electrolyte films (≤ 3µm) and LSCF or LSC cathodes. Typical manganese-oxide chromium evaporation protection layers and cathode contact layers were used. Operating parameters were: temperatures between 600°C and 750°C, a current density of 500 mA/cm², hydrogen with 20% water vapor as fuel, and a fuel utilization of ~40%. Microstructural characterization revealed that Cr-containing phases formed at different locations. SEM and TEM analysis of some cells additionally showed microstructural changes within the GDC layer. A possible explanation for the different chromium-containing phase locations based on theoretical assumptions is given.