Performance of CO₂/H₂O Co-electrolysis in a Flat-tube Solid Oxide Electrolysis Cell Ctack under Air-free Environment

Authors

Xiao-Hui Zhong, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang, PR China; Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR China
Fei Wang, China Astronaut Research and Training Center, Beijing 10086, PR China
An-Qi Wu, Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR ChinaFollow
Bei-Bei Han, Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR China
Jian-Xin Wang, Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR China
Wan-Bing Guan, Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR China

Corresponding Author

An-Qi Wu (wuanqi@nimte.ac.cn)

Abstract

This work investigates the transient performance and stability of CO₂/H₂O co-electrolysis in an air-free environment using a flat-tube solid oxide electrolysis cell (SOEC) stack. The results show that the transient behavior of the stack with and without blowing gas in the air electrode is almost the same. With a current density of 0.67 A·cm⁻²@750 °C, the stack operated for over 200 h under co-electrolysis conditions with no air blowing, and the voltage drop rate of the stack was approximately 0.203%/100 hours. Microstructure analysis reveals significant loss of Ni particles and formation of an insulating phase SrCrO₄ on the surface of the current collection layer of the air electrode, which are identified as key factors contributing to performance degradation of the stack. This study provides a reference for efficient fuel preparation technology based on SOEC stack in airless environments.

Graphical Abstract

Keywords

Co-electrolysis, Stability, No air, Electrolysis stack, Solid oxide electrolysis cell

DOI Link

https://doi.org/10.61558/2993-074X.3518

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2025-04-28

Online Available Date

2025-01-08

Revised Date

2024-12-20

Received Date

2024-11-12

Recommended Citation

Xiao-Hui Zhong, Fei Wang, An-Qi Wu, Bei-Bei Han, Jian-Xin Wang, Wan-Bing Guan. Performance of CO₂/H₂O Co-electrolysis in a Flat-tube Solid Oxide Electrolysis Cell Ctack under Air-free Environment[J]. Journal of Electrochemistry, 2025 , 31(4): 2111121.
DOI: 10.61558/2993-074X.3518
Available at: https://jelectrochem.xmu.edu.cn/journal/vol31/iss4/3