Stable, Low Polarization Resistance Solid Oxide Fuel Cell Anodes: La1鈥?i>xSrxCr1鈥?i>xFexO3-未 (x = 0.2鈥?.67)

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• 作者：Daniel E. Fowler ; Jacob M. Haag ; Claire Boland ; David M. Bierschenk ; Scott A. Barnett ; Kenneth R. Poeppelmeier
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：May 27, 2014
• 年：2014
• 卷：26
• 期：10
• 页码：3113-3120
• 全文大小：645K
• 年卷期：v.26,no.10(May 27, 2014)
• ISSN：1520-5002

文摘

The perovskite series, La<sub>1鈥?i>xsub>Sr<sub>xsub>Cr<sub>1鈥?i>xsub>Fe<sub>xsub>O<sub>3-未sub> (x = 0.2, 0.3, 0.4, 0.5, 0.67, LSCrFe), was synthesized and examined as both single phase and LSCrFe鈥揋d<sub>0.1sub>Ce<sub>0.9sub>O<sub>2-尾sub> (GDC) composite solid oxide fuel cell anodes in full cells with La<sub>0.9sub>Sr<sub>0.1sub>Ga<sub>0.8sub>Mg<sub>0.2sub>O<sub>3-蔚sub>/La<sub>0.4sub>Ce<sub>0.6sub>O<sub>2sub> bilayer electrolytes. Each anode demonstrated marked improvement in polarization resistance compared to prior studies on Fe-free La<sub>1鈥?i>xsub>Sr<sub>xsub>CrO<sub>3-未sub>-based anodes and in stability compared to studies on more Fe-rich compositions. Higher Fe content anodes yielded lower polarization resistances, with the x = 0.67 anodes obtaining resistances of 0.275 惟路cm<sup>2sup> for LSCrFe and 0.333 惟路cm<sup>2sup> for LSCrFe-GDC in humidified H<sub>2sub> at 800 掳C. The lower polarization resistance with increasing Fe content can be attributed to oxygen loss, which introduces significant ionic conductivity into these perovskites. Substitution of an intermediate amount of Fe and Sr into the perovskites can thus optimize anode performance.