| 摘 要： | In this study,we successfully synthesized double perovskite-type oxide NdBa_(0.5)Ca_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(NBCCF) using a conventional wet chemical method as the oxygen electrode for reversible solid oxide electrochemical cells (RSOCs).The polarization resistance (R_p) of the composite electrode NBCCFGd_(0.1)Ce_(0.9)O_2 (GDC) is only 0.079Ωcm~2 at 800℃under air.The single cell based on NBCCF-GDC electrode displays a peak power density of 0.941 W/cm~2 in fuel cell mode and a low R_p value of 0.134Ωcm~2.In electrolysis cell mode,the cell displays an outstanding oxygen evolution reaction (OER) activity and shows current density as high as 0.92 A/cm~2 with 50 vol%AH (Absolute Humidity) at 800℃and applied voltage of 1.3 V.Most importantly,the cell exhibits admirable durability of 60 h both in electrolysis mode and fuel cell mode with distinguished reversibility.All these results suggest that NBCCF is a promising candidate electrode for RSOC.
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