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High-performing Zr4+/Ti4+ Co-doped SrFeO3 as electrodes for symmetrical solid oxide fuel cells
Electrochimica Acta ( IF 5.5 ) Pub Date : 2024-12-16 , DOI: 10.1016/j.electacta.2024.145507 Sunil Kumar, Darshilkumar N. Chhatrodiya, Shobit Omar
Electrochimica Acta ( IF 5.5 ) Pub Date : 2024-12-16 , DOI: 10.1016/j.electacta.2024.145507 Sunil Kumar, Darshilkumar N. Chhatrodiya, Shobit Omar
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Bifunctional electrodes are critical for ensuring high performance and reliable operation in symmetrical solid oxide fuel cells (SSOFCs). This study introduces a novel Zr/Ti co-doping strategy in perovskite-structured SrFeO3-δ, which significantly enhances performance stability, establishing it as a strong candidate for symmetrical electrode applications. A series of SrFe1-xTix/2Zrx/2O3-δ (x = 0–0.2) compositions are synthesised via the conventional solid-state reaction method. The co-doped samples retain a cubic phase, albeit with considerable oxygen deficiency in air. The optimized composition, SrFe0.85Ti0.075Zr0.075O3-δ (SFTZ-0.15), demonstrates electrical conductivities of 68.5 S.cm-1 in air and 3.6 S.cm-1 in 3 % H2O/H2 at 800 °C. Under extreme reducing conditions, the brownmillerite phase and Fe particle exsolution occur. The area-specific resistance (ASR) offered by the SFTZ-0.15 electrode at 800 °C is 0.046 Ω.cm2 in air and 0.064 Ω.cm2 in moist H₂. While stable in air, the ASR rises to 0.132 Ω.cm2 after 100 h exposure in reducing conditions. Electrolyte-supported symmetrical single-cells with SFTZ-0.15 electrodes deliver a maximum power density of 732 mW.cm-2 at 800 °C, retaining 91.5 % of their performance after 100 h of continuous operation at 1.2 A.cm-2. These findings highlight the synergistic benefits of Zr4+/Ti4+ co-doping in SrFeO3-δ, showcasing its potential as a bifunctional electrode for SSOFCs.
更新日期：2024-12-17
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