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Boosting Electrochemical Performance of Sm0.5Sr0.5CoO3-δ Cathodes in Low-Temperature Solid Oxide Fuel Cells via
Bing Yang1, Mingxu Sun1, Peng Li1
1School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, China.
Abstract:
High-performance solid oxide fuel cells (SOFCs) operating at intermediate to low temperatures require cathode materials with enhanced activity and stability. This study investigates the effect of excess B-site cations on the electrochemical performance of Sm0.5Sr0.5CoO3-δ (SSC) electrodes. A series of Sm0.5Sr0.5Co1+xO3-δ (SSC1 + x, X = 0, 0.05, 0.1, 0.15, and 0.3) perovskite cathodes with varying Co excess are synthesized to investigate their effect on electrical conductivity, oxygen vacancy formation, and overall cathode properties. The Sm0.5Sr0.5Co1.1O3-δ (SSC1.1) composition demonstrates a polarization resistance of 0.517 Ω cm2 at 550 °C, outperforming the standard SSC cathode (0.711 Ω cm2). Moreover, single cells with SSC1.1 cathodes achieve a peak power density of 1.054 W cm-2 at 700 °C, marking a 25% improvement over standard SSC cathodes (0.842 W cm-2). These results highlight the potential of SSC1.1 as an advanced cathode material for enhancing SOFC performance at reduced temperatures.
