Publication date: 10th April 2024
Solid oxide electrolysis technology is gaining attention for its potential in clean synthetic fuel production. However, electrode degradation remains a significant issue, particularly in the microstructure change of the Ni-YSZ fuel electrode. This study involved the fabrication of Ni-YSZ cross-sectional model electrodes, with the morphological changes of the fuel electrodes being quantitatively evaluated by laser microscopic observations under operating condition. To evaluate the microstructure evolution of Ni/YSZ fuel electrodes, comb-shaped symmetric Ni pattern electrodes were designed on the top layer of the YSZ thin film. When operated in fuel cell mode, one side of the Ni pattern electrode spreaded, resulting in an increase in triple phase boundary (TPB) length and a decrease in electrolyte width. On the other hand, when operated in electrolysis mode, the Ni pattern electrode slightly migrated away from the electrolyte. To prevent electrochemical oxidation, platinum electrode was used as a counter electrode. Then, quantitative analysis of the Ni microstructure change in electrolysis operation became possible.
This research has been supported by NEDO, Japan (JPNP16002)
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