Intermediate-temperature solid oxide fuel cell (IT-SOFC) is promising for carbon neutrality, but its cathode is limited by the contradiction between thermal compatibility and catalytic activity. Herein, we propose a high-entropy double perovskite cathode material, GdBa(Fe0.2Mn0.2Co0.2Ni0.2Cu0.2)2O5+δ (HE-GBO) with improved compatibility and activity, in view of the high-entropy strategy by multi-elemental coupling, which owns double perovskite structure and excellent chemical compatibility with state-of-the-art Gd0.1Ce0.9O2-δ (GDC). The polarization resistance (Rp) of the symmetrical cells with HE-GBO cathode is 1.68 Ω•cm 2 at 750 ℃, and the corresponding Rp of HE-GBO-GDC (mass ratio 7 : 3) composite cathode can be greatly reduced (0.23 Ω•cm 2 at 750 ℃) by the introduction of GDC. Dendritic microchannels anode-supported single cells with HE-GBO and HE-GBO-GDC cathodes have maximum power densities of 972.12 and 1057.06 mW/cm 2 at 800 ℃, respectively, indicating that cell performance can be enhanced by high-entropy cathodes. The results demonstrate that high-performance cathodes can be developed by multiscale optimization.
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