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- Title
Low-Cost Getters for Gaseous Chromium Removal in High-Temperature Electrochemical Systems.
- Authors
Aphale, Ashish; Hu, Boxun; Singh, Prabhakar
- Abstract
Electrochemical performance degradation of the air electrode due to the presence of trace levels of gaseous chromium impurities, a critical issue in high-temperature electrochemical systems, contributes to long-term irreversible performance instabilities. We report a low-cost getter comprised of SrO and NiO to capture extrinsic chromium impurities present in ambient air. Ceramic honeycomb-supported getters have been tested for 500 h under SOFC cathode exposure conditions and characterized by scanning electron microscopy-energy dispersive X-ray spectrometry and focused ion beam-transmission electron microscopy. Chemical and structural analyses show that gaseous chromium predominantly concentrates within ~ 4-5 mm at the air inlet, leaving only the remainder of the getter free of chromium. Chromium capture mechanisms are proposed and discussed based on experimental findings and thermodynamic calculations.
- Subjects
ELECTROCHEMICAL analysis; SCANNING electron microscopy; LITHIUM-ion batteries; SURFACE coatings; X-ray spectrometers
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 1, p124
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-018-3196-2