无钴铁基层状钙钛矿材料作SOFC阴极的研究

doi:10.12422/j.issn.1006-396X.2023.04.010

摘要/Abstract

摘要：

通过溶胶凝胶一步法制备了铁基钙钛矿型复合阴极材料（Ruddlesden?Popper，RP），并对将其用作SOFC阴极的性能进行了评价。结果表明，经1 200 ℃煅烧后所制样品的组分是(La_2/3Sr_4/3)FeO₄?(La_4/3Sr_8/3)Fe₃O₁₀(LSF)；在400 ℃的空气中，样品的峰值电导率为57.0 S/cm；在800 ℃的空气中，该样品在La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ (LSGM)电解质上的界面极化阻抗为0.198 Ω·cm²；基于300 μm厚LSGM支撑的单电池，该样品用作电池阴极时的峰值功率密度可达670 mW/cm²，且持续工作50 h性能无衰减；LSF阴极的电化学性能优异且稳定，是一种非常具有潜力的SOFC阴极材料。

关键词: 固体氧化物燃料电池 (SOFC), RP钙钛矿, 阴极, 电导率, 电化学稳定性

Abstract:

The Ruddlesden?Popper (RP) perovskitetype composite cathode material was prepared by a sol?gel method,and the performance of using it as a SOFC cathode was evaluated.XRD result shows that the composite material calcined at 1 200 ℃ was (La_2/3Sr_4/3)FeO₄?(La_4/3Sr_8/3)Fe₃O₁₀(LSF).At 400 ℃,the highest conductivity of the sample is 57.0 S/cm in air.At 800 ℃,the interfacial polarization resistance of the LSF electrode on La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ (LSGM) electrolyte is 0.198 Ω·cm².Based on a single cell supported by a 300?μm?thick LSGM,the peak power density of the sample when used as a cell cathode was up to 670 mW/cm² when used as the cathode of the cell, with no performance degradation for 50 h of continuous operation.Experiments show that the LSF cathode has excellent and stable electrochemical performance,and is a very promising cathode material for SOFC.

Key words: Solid oxide fuel cell (SOFC), RP perovskite, Cathode, Electrical conductivity, Electrochemical performance

中图分类号:

TQ426

陈茜, 金莹, 马季, 张磊磊, 宋昭远. 无钴铁基层状钙钛矿材料作SOFC阴极的研究[J]. 石油化工高等学校学报, 2023, 36(4): 69-74.

Xi Chen, Ying Jin, Ji Ma, Leilei Zhang, Zhaoyuan Song. Study on Cobalt Free Iron Base Like Perovskite as Cathode of SOFC[J]. Journal of Petrochemical Universities, 2023, 36(4): 69-74.

图/表 6

图1 在1 200 ℃的空气中烧结10 h制得的LSF的XRD图谱

Fig.1 LSF XRD pattern of sintering at 1 200 ℃ for 10 h in air

图2 LSF在30~900 ℃空气中的TGA曲线

Fig.2 TGA curve of LSF material between 30~900 ℃ in air

图3 LSF在空气中的电导率及其阿伦尼乌斯曲线

Fig.3 Electrical conductivity and Arrhenius plots of the LSF in air

图4 LSF阴极的电化学阻抗谱及微观形貌

Fig.4 Impedance spectra and micromorphology of LSF cathode

图5 单电池在空气中不同温度条件下(600~800 ℃)测得的I?V和I?P曲线

Fig.5 I?V and I?P curves of single cell in air at different temperatures (600~800 ℃)

图6 LSF阴极电池的稳定性

Fig.6 Stability of LSF single cell

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