La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) is the state-of-the-art air electrode material for solid oxide electrochemical cells using oxide-ion electrolytes, yet its application in proton ceramic electrochemical cells (PCCs) remains limited, mainly attributed to its instability under operating conditions of high temperature and high humidity. To address this issue, coating a PrCoO_3−δ (PCO) catalyst onto the LSCF scaffold has been evaluated in this study. The introduction of the PCO coating not only enhances the LSCF electrode's electrochemical performance but also significantly improves its steam tolerance by preventing direct contact between steam and LSCF. A PCC single cell with the PCO-coated LSCF air electrode exhibited a peak power density of 1.14 W cm⁻² in fuel cell mode and a current density of 2.04 A cm⁻² at an applied voltage of 1.3 V in electrolysis cell mode at 650 °C. Furthermore, single cells demonstrated excellent durability under operating conditions of high temperature and high humidity, maintaining stable operation for over 1100 h at a current density of −0.5 A cm⁻² in humid air at 600 °C. This research highlights the potential of surface modification on LSCF as a promising air electrode for PCCs to achieve efficient and stable operations.

中文翻译：

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提高质子陶瓷电化学电池La0.6Sr0.4Co0.2Fe0.8O3−δ基空气电极的蒸汽耐受性和电化学性能


La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O _{3− δ} (LSCF) 是最先进的空气电极材料，用于使用氧化物离子电解质的固体氧化物电化学电池，但其在质子陶瓷电化学电池 (PCC) 中的应用仍然存在有限，主要归因于其在高温高湿操作条件下的不稳定。为了解决这个问题，本研究对在 LSCF 支架上涂覆 PrCoO _{3− δ} (PCO) 催化剂进行了评估。 PCO涂层的引入不仅增强了LSCF电极的电化学性能，而且通过防止蒸汽与LSCF之间的直接接触，显着提高了其蒸汽耐受性。具有PCO涂层LSCF空气电极的PCC单电池在燃料电池模式下表现出1.14 W cm ^-2的峰值功率密度，在电解池模式下在1.3 V的施加电压下在650℃下表现出2.04 A cm ^-2的电流密度。 °C。此外，单电池在高温高湿运行条件下表现出优异的耐久性，在600℃潮湿空气中-0.5A cm ^-2的电流密度下可稳定运行1100小时以上。这项研究凸显了 LSCF 表面改性作为 PCC 空气电极实现高效稳定运行的潜力。