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An active high-entropy air electrode for enhanced reversible solid oxide cell performance and stability
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DOI：10.1016/j.matre.2025.100381.png)
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Abstract
En 中文
The insufficient stability and poor surface reaction kinetics (i.e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)) of air electrodes are significant factors hindering the development of reversible solid oxide cells (R-SOCs). The high-entropy strategy offers a new direction to optimize air electrodes. We introduce a high-entropy air electrode, (La0.12Pr0.12Nd0.12Sm0.12Gd0.12)Sr0.4Co0.2Fe0.8O3-b (LPNSGSrCF), demonstrating a low polarization resistance (0.15 Omega cm2) and good durability (1.3 x 10-3 Omega cm2 h-1), superior to those of La0.6Sr0.4Co0.2Fe0.8O3-b (0.31 Omega cm2, 2.0 x 10-3 Omega cm2 h-1) at 650 degrees C. The elevated activity may be a result of the substantial concentration of oxygen vacancies and rapid reaction kinetics, as verified by X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and distribution of relaxation times studies. Specifically, an R-SOC with LPNSGSrCF air electrode achieves a peak power density of 1.05 W cm-2 in fuel cell mode and a current density of -0.89 A cm-2 at 1.3 V in electrolysis cell mode (with 30% H2O) at 700 degrees C. Moreover, the cells with LPNSGSrCF electrode can be stably operated in both modes for over 100 h.
Keywords:
High-entropy perovskite
Air electrodes
Oxygen reduction/evolution reaction
Reversible solid oxide cells
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