La0.6Sr0.4Co1&#x02013;xGaxO3&#x02013;d作为SOFC氧电极的性能研究

董翠翠

doi:10.3969/j.issn.1002-087X.2025.03.023

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电源技术 ›› 2025, Vol. 49 ›› Issue (3) : 637-642. DOI: 10.3969/j.issn.1002-087X.2025.03.023

研究与设计:化学电源

La_0.6Sr_0.4Co_1–_xGa_xO_3–d作为SOFC氧电极的性能研究

董翠翠

作者信息 +

Performance study of La_0.6Sr_0.4Co_1–_xGa_xO_3–d as SOFC oxygen electrode

DONG Cuicui

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文章历史 +

摘要

采用溶胶-凝胶法制备La_0.6Sr_0.4Co_1–_xGa_xO_3–d(x=0、0.05、0.1、0.15、0.2)系列氧电极材料粉体。利用扫描电镜(SEM)观察粉体形貌,并采用X射线衍射(XRD)和热膨胀仪对材料的物相结构及热膨胀性能进行了考察。发现Ga元素的加入不会引起材料晶体结构发生变化,且随着Ga掺杂量的增加,La_0.6Sr_0.4Co_1–_xGa_xO_3–d的热膨胀系数(CTE)下降。进一步,对材料的电导率以及单电池性能进行测试。结果表明当Ga的掺杂量x=0.15时,单电池性能最优。750 ℃时其最大电流密度和功率密度可分别达到1.45 A/cm²和0.56 W/cm²,具有成为固体氧化物燃料电池(SOFC)氧电极材料的潜力。

Abstract

La_0.6Sr_0.4Co_1–_xGa_xO_3–d(x=0, 0.05, 0.1, 0.15, 0.2) series cathode powders were prepared by sol-gel method. The morphology of the powder was observed using scanning electron microscopy (SEM), and the phase structure and thermal expansion properties of the material were investigated by X-ray diffraction (XRD) and thermal expansion analyzer. It is found that the addition of Ga element does not cause any changes in the crystal structure of the material. The thermal expansion coefficient (CTE) of La_0.6Sr_0.4Co_1–_xGa_xO_3–d decreases with the increase of Ga doping amount. Furthermore, the conductivity of the material and the performance of individual cells are tested. The results show that when the doping amount of Ga is x=0.15, the single cell performance is optimal. At 750 ℃, its maximum current density and power density can reach 1.45 A/cm² and 0.56 W/cm², which has the potential to become an oxygen electrode material for solid oxide batteries (SOFC).

导出引用

董翠翠. La_0.6Sr_0.4Co_1–_xGa_xO_3–d作为SOFC氧电极的性能研究[J]. 电源技术, 2025, 49(3): 637-642 https://doi.org/10.3969/j.issn.1002-087X.2025.03.023

DONG Cuicui. Performance study of La_0.6Sr_0.4Co_1–_xGa_xO_3–d as SOFC oxygen electrode[J]. Chinese Journal of Power Sources, 2025, 49(3): 637-642 https://doi.org/10.3969/j.issn.1002-087X.2025.03.023

中图分类号： TM911.4

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