Issue

Vol. 17 (2025)

Tailoring the Reversible Phase Transition of Perovskite Nanofiber Electrodes for High-Performance and Durable Reversible Solid Oxide Cells

https://doi.org/10.1007/s40820-024-01600-4
Chaofan Yin
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Jiaming Yang
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Jiangyuan Feng
Beijing Huairou Laboratory, Beijing 101400, People’s Republic of China
Yueyue Sun
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Zhengrong Liu
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Junkai Wang
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Jiajia Cui
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Zixuan Xue
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Liang Zhang
Beijing Huairou Laboratory, Beijing 101400, People’s Republic of China
Yucun Zhou
Beijing Huairou Laboratory, Beijing 101400, People’s Republic of China
Jun Zhou
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Liangfei Xu
Beijing Huairou Laboratory, Beijing 101400, People’s Republic of China
Kai Wu
Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Jianqiu Li
Beijing Huairou Laboratory, Beijing 101400, People’s Republic of China

Corresponding Author: Jun Zhou

zhoujun@mail.xjtu.edu.cn

Nano-Micro Letters, Vol. 17 (2025), Article Number: 150

Abstract

Reversible solid oxide cells (RSOCs) are capable of converting various energy resources, between electricity and chemical fuels, with high efficiency and flexibility, making them suitable for grid balancing and renewable energy consumption. However, the practical application of RSOCs is still limited by the insufficient activity and stability of the electrodes in different operating modes. Herein, a highly efficient symmetrical electrode composed of La0.3Sr0.6Ti0.1Co0.2Fe0.7O3−δ (LSTCF) nanofibers and in situ exsolved Co3Fe7 nanoparticles is developed for boosting the performance of RSOCs. The reversible phase transition, high activity and stability of the electrode have been confirmed by a combination of experimental (e.g., transmission electron microscopy and X-ray absorption fine structure) and computational studies. Electrolyte-supported RSOCs with the symmetrical electrode demonstrate excellent catalytic activity and stability, achieving a high peak power density of 0.98 W cm−2 in the fuel cell mode using H2 as the fuel (or 0.53 W cm−2 using CH4 as the fuel) and a high current density of 1.09 A cm−2 at 1.4 V in the CO2 electrolysis mode (or 1.03 A cm−2 at 1.3 V for H2O electrolysis) at 800 °C while maintaining excellent durability for over 100 h.


Highlights:
1 La0.3Sr0.6Ti0.1Co0.2Fe0.7O3−δ (LSTCF) nanofibers showed high structural reversibility.
2 LSTCF fibers and CoFe nanoparticles were reconstructed through a reversible phase transition process.
3 The LSTCF fiber electrode demonstrated excellent activity and stability for power and fuel co-generation.

Keywords

Reversible solid oxide cells Reversible phase transition Exsolution and dissolution CO2 electrolysis
Yin, Chaofan, Jiaming Yang, Jiangyuan Feng, Yueyue Sun, Zhengrong Liu, Junkai Wang, Jiajia Cui, Zixuan Xue, Liang Zhang, Yucun Zhou, Jun Zhou, Liangfei Xu, Kai Wu, and Jianqiu Li. 2025. “Tailoring the Reversible Phase Transition of Perovskite Nanofiber Electrodes for High-Performance and Durable Reversible Solid Oxide Cells”. Nano-Micro Letters 17 (February):150. https://doi.org/10.1007/s40820-024-01600-4.
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