Effect of Ni-GDC AFL Composition on Performance of IT-SOFCs

摘要

Anode supported solid oxide fuel cells (SOFCs) with various NiO content in the anode function layer (AFL) were fabricated and investigated. For AFLs with lower NiO content, the observed open circuit potential was higher. However, the highest maximum power density of 1.15 W/cm2 at 650 ℃ was achieved at 60 wt% of NiO in the AFL, which is a 1:1 volume ratio of Ni to GDC phase. The optimal composition was valid in the intermediate temperature range from 450 to 650 ℃. The effect of the optimal composition on power density was retained for 200 hours with high power density of 1.1 W/cm2. Electrochemical impedance tests supported this result by showing the lowest electrode area specific resistance at 60 wt% NiO, which has a linear relationship with maximum power density.