Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems

• DOI: 10.1021/acsami.9b09677
• Publication Date: 2019-08-29T06:48:45Z
• Authors: Junsung Hong; Ashish N. Aphale; Su Jeong Heo; Boxun Hu; Michael Reisert; Seraphim Belko; Prabhakar Singh
• Keywords: Getter

Traces (ppm to ppb level) of airborne contaminants such as CrO2(OH)2 and SO2 irreversibly degrade the electrochemical activity air electrodes in high-temperature devices solid oxide fuel cells by retarding oxygen reduction reactions. The use getter has been proposed a cost-effective strategy mitigate electrode poisoning. However, owing harsh operating conditions (i.e., exposure heat moisture), long-term durability materials remains considerable challenge. In this study, we report our findings on strontium manganese (SMO) robust material for cocapture Cr S contaminants. SMO with 3D honeycomb architecture, fabricated via slurry dip-coating, successfully maintains under flow gaseous species, validating getter's capability capturing traces Investigations found that both Sr Mn cations contribute absorption reaction processes are accompanied morphological elongation form SrSO4 nanorods SrCrO4 whiskers, which favors continued incoming also displays stability at high temperatures humid environments without phase transformation hydrolysis. These results demonstrate feasibility severe representative systems.