Citation: Jiaxiang Sun, Rongzheng Ren, Hualiang Yue, Wencan Cui, Gaige Wang, Chunming Xu, Jinshuo Qiao, Wang Sun, Kening Sun, Zhenhua Wang. High-entropy perovskite oxide BaCo_0.2Fe_0.2Zr_0.2Sn_0.2Pr_0.2O_3-_δ with triple conduction for the air electrode of reversible protonic ceramic cells[J]. Chinese Chemical Letters, ;2023, 34(7): 107776. doi: 10.1016/j.cclet.2022.107776 shu

High-entropy perovskite oxide BaCo_0.2Fe_0.2Zr_0.2Sn_0.2Pr_0.2O_3-_δ with triple conduction for the air electrode of reversible protonic ceramic cells

Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China

7520200218@bit.edu.cn

wangzh@bit.edu.cn

Received Date: 12 July 2022
Revised Date: 7 August 2022
Accepted Date: 22 August 2022
Available Online: 28 August 2022

Figures(6)

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 BaCo_0.2Fe_0.2Zr_0.2Sn_0.2Pr_0.2O_3- (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 ℃). As-prepared RPCCs with a BCFZSP air electrode at 600 ℃ 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.
- High-entropy perovskite oxide,
- Triple-conducting oxide,
- Air electrode,
- Reversible protonic ceramic cells,
- Hydrogen production
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沈阳化工大学材料科学与工程学院沈阳 110142

High-entropy perovskite oxide BaCo0.2Fe0.2Zr0.2Sn0.2Pr0.2O3-δ with triple conduction for the air electrode of reversible protonic ceramic cells

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通讯作者: 陈斌, bchen63@163.com

High-entropy perovskite oxide BaCo_0.2Fe_0.2Zr_0.2Sn_0.2Pr_0.2O_3-_δ with triple conduction for the air electrode of reversible protonic ceramic cells