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High-Entropy Co-Based Oxygen Electrodes with Enhanced Thermomechanical Compatibility for Reversible Protonic Ceramic
Jianxiong Wang1,2, Zuo Li3, Wei Chen1
1School of Chemical and Environmental Engineering, China University of Mining & Technology-Beijing, Beijing, 100083, China.
None:
Reversible protonic ceramic cells (R-PCCs) are a kind of distinguished long-time energy conversion and storage device. The utilization of oxygen electrodes is vital to achieve high electrochemical performances for R-PCCs, demanding high catalytic activity toward oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and appropriate thermal expansion coefficients (TEC). Herein, novel high-entropy perovskites Pr0.2Ba0.2Sr0.2La0.2Nd0.2MeO3-δ (Me = Co, Fe, Mn) are explored. Pr0.2Ba0.2Sr0.2La0.2Nd0.2CoO3-δ (PBSLNC) exhibits a TEC of 12.02 × 10-6 K-1, which is thermomechanical compatible with BaCe0.7Zr0.1Y0.1Yb0.1O3-δ (BCZYYb) electrolyte. The cell with PBSLNC electrode delivers a peak power density of 0.87 W cm-2 in fuel cell (FC) mode and a current density of -1.39 A cm-2 at 1.3V and 650 °C under H2O electrolysis (EC) mode. The R-PCCs with PBSLNC electrode also achieve a distinguished current density of -1.45 A cm-2 at 1.3 V and 700 °C under CO2-H2O co-electrolysis condition. Moreover, the R-PCCs with PBSLNC electrode demonstrate exceptional stability for 150 h in both FC and EC modes, 96 h in H2O-CO2 co-electrolysis mode, and 100 h (10 cycles) in reversible mode. This research provides a novel oxygen electrode for R-PCCs, as well as a strategy to design efficient Co-based oxide catalysts with low TEC for advanced R-PCCs.
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