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- W4293577895 abstract "Reversible protonic ceramic cells (RPCCs) show great potential as new-generation energy conversion and storage devices. However, the mature development of RPCCs is seriously hindered by the inactivity and poor stability of air electrodes exposed to concentrated vapor under operating conditions. Herein, we report a high-entropy air electrode with the composition BaCo0.2Fe0.2Zr0.2Sn0.2Pr0.2O3-δ (BCFZSP), which shows integrated electronic, protonic and oxygenic conduction in a single perovskite phase and excellent structural stability in concentrated steam. Such triple conduction can spread the electrochemically active sites of the air electrode to the overall electrode surface, thus optimizing the kinetics of the oxygen reduction and evolution reactions (0.448 Ω cm2 of polarization resistance at 550 °C). As-prepared RPCCs with a BCFZSP air electrode at 600 °C achieved a peak power density of 0.68 W/cm2 in fuel-cell mode and a current density of 0.92 A/cm2 under a 1.3 V applied voltage in electrolysis mode. More importantly, the RPCCs demonstrate an encouragingly high stability during 120 h of reversible switching between the fuel-cell and electrolysis modes. Given their excellent performance, high-entropy perovskites can be promising electrode materials for RPCCs." @default.
- W4293577895 created "2022-08-30" @default.
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- W4293577895 date "2023-07-01" @default.
- W4293577895 modified "2023-10-16" @default.
- W4293577895 title "High-entropy perovskite oxide BaCo0.2Fe0.2Zr0.2Sn0.2Pr0.2O3- with triple conduction for the air electrode of reversible protonic ceramic cells" @default.
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- W4293577895 doi "https://doi.org/10.1016/j.cclet.2022.107776" @default.
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