Publication date: 10th April 2024
One way to achieve enhancement of the electrochemical performance of solid oxide fuel cell cathode at low temperatures is to mix two oxides with dissimilar structures to form a composite electrode. To understand the enhancement factor of the composite electrode consisting of ionic conducting oxide, Ce0.9Gd0.1O1.95 (GDC), and mixed ionic and electronic conducting oxide, La0.6Sr0.4CoO3-δ (LSC), the electrochemical measurement was performed. It was found that the area-specific conductivity (σe) of the composite electrode enhanced compared to the LSC porous electrode at low temperatures (T < 873 K) under high oxygen partial pressure region (1 – 10-1 bar). The transmission line mode (TLM) was utilized to understand the enhancement factor of the composite electrode. The experimental values for both LSC and composite electrodes (30% LSC: 70% GDC volume ratio) were nearly twice as large as the calculated values at the low temperature. However, the calculated values at 873 K were similar to the experimental values. The discrepancy could be due to the accuracy of the calculated microstructure on the porous electrode, although another possible reason may exist.
In the other case, the enhancement of the ionic conducting pathway due to the existence of the GDC was considered in the calculated σe by TLM for the composite electrode. Considering the low-temperature measurements, the effect of surface diffusion is inevitable. Thus, there are two competing reaction pathways: surface reaction and surface diffusion. The surface diffusion could be one of the possible reasons for the discrepancy between calculated and measured σe since the TLM only considered the surface reaction. Thus, it is necessary to reveal the enhancement factor and reaction mechanism by considering two reaction pathways. Therefore, in this study, the existence of an additional reaction pathway to understand the enhancement factor is discussed.
This work was supported by JST, Japan, as part of “Phase Interface Science for Highly Efficient Energy Utilization” project in strategic basic research program, CREST.
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