Electrochemical Properties of Co⁃Doped La1.5Ca0.5NiO4+δ Cathode Materials

doi:10.12422/j.issn.1672-6952.2024.02.005

Abstract

Abstract:

A new type of Ruddlesden?Popper cobalt?rich layer perovskite oxide La_1.5Ca_0.5Ni_0.2Co_0.8O₄₊_δ (LCNC) was synthesized by a sol?gel process. The results show that the conductivity of LCNC in air at 400 ℃ to 800 ℃ is 4~58 S/cm, which is better than that of most reported SOFC cathode materials. The polarization impedance of symmetrical battery LCNC|LSGM|LCNC is 0.16 Ω·cm² at 800 ℃. The maximum power density of the single cell supported by 300 μm thick La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ (LSGM) with the LCNC cathode was 527 mW/cm², and the performance of the single cell decreases slightly after working continuously for 50 hours. The experimental results show that LCNC is a potential SOFC cathode material.

Key words: Solid oxide fuel cell, Electrochemical performance, Cathode, Electrical conductivity, Polarization impedance

摘要：

采用溶胶凝胶法合成一种Ruddlesden?Popper(R?P)型富钴的新型层状钙钛矿型阴极材料La_1.5Ca_0.5Ni_0.2Co0.8O₄₊_δ (LCNC)，并进行了电化学性能测试。结果表明，LCNC在空气中400~800 ℃下的电导率为4~58 S/cm，优于多数SOFC阴极材料；在800 ℃下测得对称电池LCNC|LSGM|LCNC的极化阻抗为0.16 Ω·cm²，该电极基于300 μm厚La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ (LSGM)支撑的单电池的最大功率密度为527 mW/cm²，且连续工作50 h后单电池性能仅略微衰减；LCNC是一种具有潜力的SOFC阴极材料。

关键词: 固体氧化物燃料电池, 电化学性能, 阴极, 电导率, 极化阻抗

CLC Number:

TE662

Jing JIANG, Yunfeng SONG, Ji MA, Lei ZHANG, Leilei ZHANG, Zhaoyuan SONG. Electrochemical Properties of Co⁃Doped La_1.5Ca_0.5NiO₄₊_δ Cathode Materials[J]. Journal of Liaoning Petrochemical University, 2024, 44(2): 29-35.

蒋靖, 宋云峰, 马季, 张雷, 张磊磊, 宋昭远. Co掺杂La_1.5Ca_0.5NiO₄₊_δ 阴极材料的电化学性能[J]. 辽宁石油化工大学学报, 2024, 44(2): 29-35.

Figures/Tables 9

Fig.1 XRD patterns of LCN and LCNC sintered in air at 1 150 ℃ for 7 h

Fig.2 The electrical conductivity of LCN and LCNC in air at 400~800 ℃

Fig.3 Symmetrical battery EIS in air at 600~800 oC

Fig.4 Polarization impedance of symmetrical battery in air at 600~800 ℃

Fig.5 DRT curve of LCNC impedance spectrum fitting in air at 600~800 ℃

Fig.6 I?V and I?P curves of single cell at 600~800 ℃

Fig.7 Power density of single cell at 600~800 ℃

Fig.8 SEM diagram of LCNC cathode and LCN cathode after testing

Fig.9 Short?term stability of LCN cathode and LCNC cathode single cells at 700 ℃ in air atmosphere

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Electrochemical Properties of Co⁃Doped La_1.5Ca_0.5NiO₄₊_δ Cathode Materials

Co掺杂La_1.5Ca_0.5NiO₄₊_δ 阴极材料的电化学性能

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Figures/Tables 9

References 37

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