Iron-based Perovskite Material La0.25M0.75FeO3-δ (M= Ca, Sr, Ba): Preparation and Performance as Cathode for Solid Oxide Fuel Cells

doi:10.15541/jim20240500

Abstract

Abstract: Solid Oxide Fuel Cell (SOFC) performance is mainly constrained by the cathode's oxygen reduction reaction (ORR), which is crucial for overall cell efficiency. This study synthesized La_0.25M_0.75FeO_3-_δ (M=Ca, Sr, Ba, abbreviated as LCF, LSF, LBF) perovskite cathodes based on tolerance factors and structural design to examine the effects of Ba, Sr, and Ca doping on electrochemical performance. Different alkaline earth elements have a significant effect on the crystal structure. LBF is Pm-3m cubic phase, LSF is R-3c rhombohedral phase, and LCF is a composite phase of P21ma orthogonal and Pcmn rhombohedral. The difference of crystal structure also leads to various thermal expansion coefficient (TEC) and electrical conductivity. LCF possesses the smallest TEC (1.38 × 10^-56 K^-1), while LSF possesses the highest conductivity, which reaches 404.4 S·cm^-1 at 550 °C. All of three Fe-based cathodes exhibit excellent stability in air and CO₂ atmospheres, as well as chemical compatibility with electrolytes. In addition, different alkaline earth elements also affect the catalytic activity of the material. LSF and LBF have low area specific resistance (ASR). At 800 °C, their ASR are only 0.022 and 0.027 Ω·cm² which are better than 0.351 Ω·cm² of LCF. The higher oxygen reduction activity is attributed to its crystal structure, oxygen adsorption and dissociation ability. In view of the advantages and disadvantages of Ba²⁺, Sr²⁺ and Ca²⁺ in cathode performance, medium/high-entropy design can be effectively introduced in A-site in the future to give full play to their respective advantages to obtain SOFC cathode with excellent comprehensive performance.

Key words: solid oxide fuel cell, perovskite, cobalt-free cathode, electrochemical performance

CLC Number:

TM911

YANG Hengqiang, ZHANG Xinyue, MA Yichu, ZHOU Qingjun. Iron-based Perovskite Material La_0.25M_0.75FeO_3-_δ (M= Ca, Sr, Ba): Preparation and Performance as Cathode for Solid Oxide Fuel Cells[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20240500.

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Iron-based Perovskite Material La_0.25M_0.75FeO_3-_δ (M= Ca, Sr, Ba): Preparation and Performance as Cathode for Solid Oxide Fuel Cells

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