This study focuses on reducing the cathode polarization resistance through the use of mixed ionic electronic conductors and the optimization of cathode microstructure to increase the number of electrochemically active sites. Among the available mixed ionic electronic conductors (MIECs), the layered perovskite GdBa_0.5Sr_0.5CoFeO_5+δ (GBSCF) was chosen as a cathode material for intermediate temperature solid oxide fuel cells owing to its excellent electrochemical performance and structural stability. The optimized microstructure of a GBSCF–yttria‐stabilized zirconia (YSZ) composite cathode was prepared through an infiltration method with careful control of the sintering temperature to achieve high surface area, adequate porosity, and well‐organized connection between nanosized particles to transfer electrons. A symmetric cell shows outstanding results, with the cathode exhibiting an area‐specific resistance of 0.006 Ω cm² at 700 °C. The maximum power density of a single cell using Ce–Pd anode with a thickness of ∼80 μm electrolyte was ∼0.6 W cm⁻² at 700 °C.

中文翻译：

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烧结温度低的纳米结构双钙钛矿阴极，用于中温固体氧化物燃料电池

这项研究的重点是通过使用混合离子电子导体来降低阴极极化电阻，以及优化阴极微观结构以增加电化学活性位点的数量。在可用的混合离子电子导体（MIEC）中，层状钙钛矿GdBa _0.5 Sr _0.5 CoFeO _{5+ δ}由于其优异的电化学性能和结构稳定性，（GBSCF）被选作中温固体氧化物燃料电池的正极材料。GBSCF-氧化钇稳定的氧化锆（YSZ）复合阴极的优化微观结构是通过渗透方法制备的，仔细控制烧结温度以实现高表面积，足够的孔隙率以及纳米级粒子之间良好组织的连接以传输电子。对称电池显示出出色的结果，阴极在700°C下的比表面积电阻为0.006Ωcm ²。在700°C下，使用厚度为80μm电解质的Ce-Pd阳极的单电池的最大功率密度为〜0.6 W cm ^-2。