About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Comparison of Cr-Poisoning Mechanisms of Air Electrodes in Ceramic Proton and Oxide-Ion Conducting Electrochemical Cells |
| Author(s) |
Kevin Huang |
| On-Site Speaker (Planned) |
Kevin Huang |
| Abstract Scope |
Chromium (Cr) poisoning is a well-established and critical degradation mechanism in oxide-ion–conducting electrochemical cells, with its underlying processes extensively documented. As ceramic proton-conducting electrochemical cells rapidly emerge as a promising candidate for next-generation solid oxide fuel cells and electrolyzers, it is imperative to establish a clear understanding of Cr-poisoning behavior in these systems. Unfortunately, this area remains largely unexplored. In this presentation, we present our integrated experimental and theoretical investigation of Cr-poisoning mechanisms in BaCoO3-based air electrodes of proton-conducting cells. Our results reveal that Cr poisoning is not only present but can become a dominant degradation pathway under relevant operating conditions. The revealed Cr-poisoning mechanisms are closely compared with those of oxide-ion conducting cells. The findings highlight an urgent need to reassess electrode stability in Cr-containing environments for proton-conducting systems and to develop corresponding mitigation solutions. |
