Preparation and Performance of High-Performance LSFT-GDC Composite Electrode

doi:10.16552/j.cnki.issn1001-1625.2025.0328

Abstract

Abstract: Solid oxide fuel cells (SOFCs) have attracted extensive attention due to their exceptional efficiency, wide fuel selection, and low environmental pollution compared to conventional power generation systems. In this study, composite electrode materials comprising perovskite oxide La_0.3Sr_0.7Fe_0.7Ti_0.3O₃ (LSFT) and oxygen-ion conductor Gd_0.2Ce_0.8O_2-δ (GDC) were synthesized via the sol-gel method for application as both cathode and anode in symmetric solid oxide fuel cells (SSOFCs).The results show that the composite electrodes prepared with different mass ratios of LSFT and GDC exhibit good chemical compatibility. At 800 ℃, the symmetric cell using LSFT-GDC composite electrode (the mass ratio of LSFT and GDC is 6:4) achieves a polarization resistance of approximately 0.28 Ω·cm² (under humidified hydrogen atmosphere), with a maximum power density of 286 mW·cm^-2, demonstrating an excellent electrochemical performance. This enhanced performance is attributed to the LSFT composited with ionic conductor GDC, which extends the triple-phase reaction interface of the electrode material and improves catalytic activity for both oxygen reduction and hydrogen oxidation reactions. Furthermore, the symmetric cell demonstrates exceptional stability during a 24 h operational test in wet hydrogen atmosphere without performance degradation and maintained consistent electrochemical properties through 5 oxygen reduction cycles.

Key words: symmetric solid oxide fuel cell, composite electrode, oxygen reduction stability, electrochemical performance test, relaxation time, stability

CLC Number:

TM205.1

DONG Hao, CAO Zhiqun, LI Na, WEI Zhaotong. Preparation and Performance of High-Performance LSFT-GDC Composite Electrode[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3873-3879.

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