Citation: Zhen Liu, Qi Zhang, Yongqi Zhang, Rongzheng Ren, Chunming Xu, Zhenhua Wang, Jinshuo Qiao, Wang Sun, Kening Sun. Enhancing proton mobility through radius-matched Ta⁵⁺ doping in Sr₂Fe_1.5Mo_0.5O_6-δ triple-conducting oxide for high-efficiency protonic ceramic electrolysis cells[J]. Chinese Chemical Letters, ;2026, 37(12): 111884. doi: 10.1016/j.cclet.2025.111884 shu

Enhancing proton mobility through radius-matched Ta⁵⁺ doping in Sr₂Fe_1.5Mo_0.5O_6-δ triple-conducting oxide for high-efficiency protonic ceramic electrolysis cells

Beijing Key Laboratory of Chemical Power Source and Green Catalysis, Beijing Institute of Technology, Beijing 100081, China

renrongzheng@bit.edu.cn

18010099836@163.com

wangzh@bit.edu.cn

Received Date: 28 July 2025
Revised Date: 17 September 2025
Accepted Date: 23 September 2025
Available Online: 24 September 2025

Figures(3)

Protonic ceramic electrolysis cells (PCECs) are promising for energy conversion and hydrogen production. Developing air electrodes with high reaction kinetics and durability is crucial for their broad applications. In this study, a novel triple-conducting oxide air electrode is developed by incorporating Ta⁵⁺ ions into the Sr₂Fe_1.5Mo_0.5O_6-δ substrate. This modification ensures the lattice matching due to compatible ionic radii, while simultaneously modulating oxygen vacancy concentration. The hydration capacity of SFMTa material is enhanced, leading to an increase in proton defects and improving proton mobility. When tested in air with 3 vol% H₂O at 1.3 V and 700 ℃, the Sr₂Fe_1.5Mo_0.4Ta_0.1O_6-δ single cell demonstrates a relatively high current density of 2.17 A/cm². Furthermore, the cell exhibits stable operation for 120 h without significant degradation, indicating the chemical stability of the material. The ionic radius matching strategy offers a practical approach for the development of highly efficient and durable air electrodes for PCECs.
- Protonic ceramic electrolysis cells,
- Triple-conducting oxide,
- Radius matching,
- Air electrode,
- Water electrolysis
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Enhancing proton mobility through radius-matched Ta5+ doping in Sr2Fe1.5Mo0.5O6-δ triple-conducting oxide for high-efficiency protonic ceramic electrolysis cells

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通讯作者: 陈斌, bchen63@163.com

Enhancing proton mobility through radius-matched Ta⁵⁺ doping in Sr₂Fe_1.5Mo_0.5O_6-δ triple-conducting oxide for high-efficiency protonic ceramic electrolysis cells