SrFeO3−δ 用作固体氧化物燃料电池对称电极的电化学性能,ACS Applied Energy Materials

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SrFeO3−δ 用作固体氧化物燃料电池对称电极的电化学性能
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-01-30 , DOI: 10.1021/acsaem.2c04034
Sunil Kumar ₁ , Amit Das ₁ , Shobit Omar _{1,

2}

Affiliation

尽管SrFeO _3−δ在氧化和还原条件下都具有高混合离子-电子电导率，但早前已有报道显示出大面积电阻率。_{本研究阐明了这一方面，并研究了 SrFeO 3− δ}中的缺陷化学和电化学性能相关性，以便在固体氧化物燃料电池中用作对称电极。粉末合成采用传统的固相反应法。结构表征表明正交钙钛矿相形成，δ为 0.21。^{~114.9 和 0.26 S·cm –1}的高直流电导率分别在 800 °C 的空气和还原条件下观察到。_{SrFeO 3− δ}电极的面积比电阻 (ASR)是在各种气体环境下的对称半电池配置中测量的。在 800 °C 时，SrFeO _{3− δ}在空气、氧气和 3% H ₂ O/H ₂中分别提供 0.082、0.055 和 0.122 Ω·cm ²的低 ASR 。尽管 ASR 在氧化气氛中具有出色的时间稳定性，但由于褐镁铝石相的形成，在还原条件下 100 小时后 ASR增加到 0.42 Ω·cm ^{2 。}氧化还原循环性能也受到 ASR在 800 °C 3% H 中从 0.13 上升到 0.24 Ω·cm ^2的影响20 个循环后₂ O/H _{2 。}在 800 °C 下，基于 SrFeO ₃₋_δ^{电极的电解质支持的对称单电池实现了 202 mW·cm -2}的最大功率密度。结果证明了使用基于 SrFeO ₃₋_δ的电极用于对称固体氧化物燃料电池的可行性。

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Electrochemical Performance of SrFeO3−δ for Application as a Symmetric Electrode in Solid Oxide Fuel Cells

SrFeO_3−δ has been earlier reported to exhibit a large area-specific resistance even though it possesses high mixed ionic–electronic conductivity both in oxidizing and reducing conditions. The present study clarifies this aspect and investigates the defect chemistry and electrochemical performance correlations in SrFeO_3−δ for the possible use as a symmetric electrode in solid oxide fuel cells. A conventional solid-state reaction method is adopted for powder synthesis. Structural characterization indicates an orthorhombic perovskite phase formation with a δ of 0.21. High dc electrical conductivities of ∼114.9 and 0.26 S·cm^–1 are observed at 800 °C in air and reducing conditions, respectively. The area-specific resistance (ASR) for the SrFeO_3−δ electrode is measured in a symmetrical half-cell configuration under various gas environments. At 800 °C, SrFeO_3−δ offered low ASRs of 0.082, 0.055, and 0.122 Ω·cm² in air, oxygen, and 3% H₂O/H₂, respectively. Although the ASR possesses excellent temporal stability in an oxidizing atmosphere, it increases to 0.42 Ω·cm² after 100 h in reducing conditions owing to the brownmillerite phase formation. The redox cycling performance is also affected with the ASR rising from 0.13 to 0.24 Ω·cm² at 800 °C in 3% H₂O/H₂ after 20 cycles. A maximum power density of 202 mW·cm⁻² is achieved from the electrolyte-supported symmetric single cell based on the SrFeO_3−δ electrodes at 800 °C. The results demonstrate the viability of using a SrFeO_3−δ-based electrode for symmetrical solid oxide fuel cells.

更新日期：2023-01-30

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