Abstract
The mechanical stability of an SOFC stack is compromised when its cells operate in oxidation-reduction (Redox) environments. Previous studies, based mainly on voltage-current or electrochemical impedance measurements, showed that cell performance degraded upon redox cycling above 600°C. Therefore, the purpose of this work is to investigate the Redox process and the stability of a SOFC stack applying the Acoustic Emission (AE) monitoring technique. The investigation includes the interpretation of AE events and signals considering their waveform and frequency content.
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