Calcium (Ca) Substitution for Strontium (Sr) in La₀.₅₈Sr₀.₄Co₀.₂Fe₀.₈O₃−δ: Stability and Elechtrochemical Performance in IT-SOFC Cathodes

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2025-01-04 DOI:10.1016/j.electacta.2025.145662

Majid Jafari, Fatemeh Yadollahi Farsani, Fabian Grimm

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Abstract

The study investigates the effects of substituting calcium (Ca) for strontium (Sr) in La₀.₅₈Sr₀.₄Co₀.₂Fe₀.₈O₃_−δ (L58CCF) perovskite, evaluating its thermal stability and electrochemical performance as a potential cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Through X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS), L58CCF demonstrates superior thermal stability, maintaining its structure up to 1200°C, compared to L58SCF, which undergoes a phase transition above 1000°C. The L58CCF symmetric cell sintered at 950°C has the lowest area-specific resistance (ASR) of 0.99 Ω·cm², offering competitive ASR values compared to L58SCF and L6CCF ones. Additionally, the L58CCF cathode showed an oxygen reduction reaction (ORR) polarization resistance of 0.47 Ω·cm^² at 800°C, further indicating its efficiency as a cathode material. The study concludes that while L58CCF presents a promising balance of stability and electrochemical performance, further optimization is needed to address impurity phase issues and enhance long-term durability for IT-SOFC applications.

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.