Study on Cobalt Free Iron Base Like Perovskite as Cathode of SOFC

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

Abstract

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

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

CLC Number:

TQ426

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.

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.

Figures/Tables 6

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

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

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

Fig.4 Impedance spectra and micromorphology of LSF cathode

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

Fig.6 Stability of LSF single cell

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