AbstractElectrochemical 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… Click to show full abstract
AbstractElectrochemical 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.
               
Click one of the above tabs to view related content.