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

Authors

Xiaohui Zhong, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211, 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, Zhejiang, 315201, PR China.
Fei Wang, China Astronaut Research and Training Center, Beijing, 10086, PR China.
Anqi 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, Zhejiang, 315201, PR China.
Beibei 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, Zhejiang, 315201, PR China.
Jianxin 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, Zhejiang, 315201, PR China.
Wanbing 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, Zhejiang, 315201, PR China.

Document Type

Article

Corresponding Author(s)

Anqi 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 0.67A·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

10.61558/2993-074X.3518

Online Date

1-8-2025

Recommended Citation

Xiaohui Zhong , Fei Wang , Anqi Wu , Beibei Han , Jianxin Wang , Wanbing Guan. Performance of CO₂/H₂O Co-electrolysis in a Flat-tube Solid Oxide Electrolysis Cell Stack under Air-free Environment[J]. Journal of Electrochemistry, doi: 10.61558/2993-074X.3518.