电极
材料科学
陶瓷
氧化物
高温电解
电解
化学工程
储能
热传导
极化(电化学)
无机化学
化学
复合材料
热力学
物理化学
冶金
物理
功率(物理)
电解质
工程类
作者
Jiaxiang Sun,Rongzheng Ren,Hualiang Yue,Wencan Cui,Gai-Ge Wang,Xu Chen,Jinshuo Qiao,Wang Sun,Kening Sun,Zhenhua Wang
标识
DOI:10.1016/j.cclet.2022.107776
摘要
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.
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