PrBaCo₂O_5+σ-BaZr_0.1Ce_0.7Y_0.1Yb_0.1O₃ (PBC-BZCYYb) composite cathodes are prepared by repeating impregnation (up to 5 times) of PBC into BZCYYb scaffold for proton-conducting solid oxide fuel cells with Ni-BZCYYb anode and BZCYYb electrolyte. The single-cells are evaluated electrochemically at temperatures between 600 and 750 °C using humidified hydrogen (∼3% H₂O) as the fuel and air as the oxidant, and the corresponding electrochemical impedance spectra of the cells acquired at open circuit voltage are analyzed by the distribution of relaxation time. The optimal PBC loading in the composite cathode is 36 wt%, which is obtained by 4 times of PBC impregnation and leads to the highest cell performance with a peak power density of 0.49 W cm⁻² and the smallest polarization resistance of 0.078 Ω cm² at 750 °C. With the decrease of temperature from 750 to 600 °C, the peak power density is decreased from 0.49 to 0.17 W cm⁻²and the polarization resistance is increased from 0.078 to 1.085 Ω cm², and the dominating processes of polarization are changed from those in the anode to the ones in the cathode.

通过将PBC浸渍（最多5次）到BZCYYb支架中（用于质子导电的含Ni的固体氧化物燃料电池）重复制备PrBaCo ₂ O _{5 +σ-} BaZr _0.1 Ce _0.7 Y _0.1 Yb _0.1 O ₃（PBC-BZCYYb）复合阴极-BZCYYb阳极和BZCYYb电解质。在600至750°C的温度下，使用加湿的氢气（〜3％H ₂O）作为燃料，空气作为氧化剂，并通过弛豫时间的分布分析了在开路电压下获得的电池的相应电化学阻抗谱。复合阴极中的最佳PBC负载为36 wt％，这是通过PBC浸渍的4倍获得的，从而以最高的电池性能实现峰值功率密度为0.49 W cm ^-2，而最小的极化电阻为0.078Ωcm ²在750°C下。随着温度从750降低到600°C，峰值功率密度从0.49降低到0.17 W cm ^-2，而极化电阻从0.078升高到1.085Ωcm ²，并且极化的主要过程从阳极的过程变成了阴极的过程。