Novel mixed H+/e−/O2− conducting cathode material PrBa0.9K0.1Fe1.9Zn0.1O5+δ for proton-conducting solid oxide fuel cells,Journal of Materials Chemistry A

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Novel mixed H+/e−/O2− conducting cathode material PrBa0.9K0.1Fe1.9Zn0.1O5+δ for proton-conducting solid oxide fuel cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-07-29 , DOI: 10.1039/d2ta04457a
Bo Liu ₁ , Zongbao Li ₂ , Xinwei Yang ₁ , Dong Yan ₁ , Jian Li ₁ , Lichao Jia ₁

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Double perovskite material PrBa_0.9K_0.1Fe_1.9Zn_0.1O_5+δ (PBKFZ) has been designed using the first-principle calculations and synthesized as a new cathode for proton-conducting solid oxide fuel cells. The influence of K-doping on the crystal structure, structure stability, thermal expansion behavior, electronic conductivity, proton uptake, and electrochemical performance has been investigated. PBKFZ presents the P4/mmm space group, and its thermal expansion coefficient is 16.110⁻⁶ K⁻¹. The oxygen vacancy concentrations and proton uptake capacity of PrBaFe_1.9Zn_0.1O_5+δ (PBFZ) in wet air (5% H₂O) are significantly improved with K doping. The single cell with the PBKFZ cathode shows an excellent electrochemical performance with a peak power density of 1.4 W cm⁻² and polarization resistance of 0.06 Ω cm² at 700 °C, which is significantly higher than that of the cell using the pristine PBFZ cathode. This study provides a new and rational strategy to design a high-performance cathode for proton-conducting SOFCs.

中文翻译：

用于质子传导固体氧化物燃料电池的新型混合 H+/e-/O2- 导电阴极材料 PrBa0.9K0.1Fe1.9Zn0.1O5+δ

采用第一性原理计算设计了双钙钛矿材料 PrBa _0.9 K _0.1 Fe _1.9 Zn _0.1 O _{5+ δ} (PBKFZ)，并将其合成为用于质子传导固体氧化物燃料电池的新型阴极。研究了 K 掺杂对晶体结构、结构稳定性、热膨胀行为、电子电导率、质子吸收和电化学性能的影响。PBKFZ呈现P 4/ mmm空间群，其热膨胀系数为16.110 ^-6 K ^-1。PrBaFe _1.9 Zn的氧空位浓度和质子吸收能力K 掺杂显着改善了_{湿空气（5% H 2 O）中的}_0.1 O_{5+ δ} (PBFZ)采用 PBKFZ 正极的单电池表现出优异的电化学性能，在 700 ℃时峰值功率密度为 1.4 W cm^-2，极化电阻为 0.06 Ω cm²，显着高于使用原始 PBFZ 正极的电池. 本研究为设计用于质子传导 SOFC 的高性能阴极提供了一种新的合理策略。

更新日期：2022-07-29

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