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Ca掺杂LNF阴极材料的制备与电化学性能改善
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内蒙古科技大学材料与冶金学院 内蒙古包头市

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中图分类号:

TM911.4

基金项目:

国家自然科学(51974167)


Preparation and Electrochemical Performance Improvement of Alkaline Earth Metal Ca Doped LNF Cathode
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Affiliation:

School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    近年来,LaNi0.6Fe0.4O3-δ阴极材料在金属连接体下具有优异的抗铬毒化性能备受关注,但其电化学性能相对较低。本文通过Ca2+掺杂LaNi0.6Fe0.4O3-δ(LNF)阴极材料改善电化学性能,实验采用甘氨酸燃烧法制备La1-xCaxNi0.6Fe0.4O3-δ(LCNF)阴极材料,Ca2+掺杂量分别为0.05、0.10、0.15、0.20。应用X-Ray衍射表征材料的物相组成,SEM观察阴极材料的微观结构,XPS分析阴极材料表面元素的化学形态,电化学交流阻抗谱技术分析阴极材料的电化学活性。结果表明,LCNF阴极材料随着Ca2+掺杂量的增加,氧还原反应活化能减小,这一现象与DRT(弛豫时间分布)分析结果相吻合。LCNF(x=0.20)阴极材料在750℃具有最小的极化阻抗(0.88Ωcm2),与LNF阴极材料相比表现出更加优异的氧催化活性,使LCNF阴极材料在IT-SOFC具有更加广阔的应用前景。

    Abstract:

    In recent years, LaNi0.6Fe0.4O3-δcathode materials have pay a attention to chromium poisoning performance under metal interconnects, but it has relatively low electrochemical performance. This paper improves the electrochemical performance of LNF cathode by Ca doping, La1-xCaxNi0.6Fe0.4O3-δ(x=0、0.05、0.10、0.15、0.20) cathode material was prepared by a glycine combustion method. The phase composition of the material was characterized by X-Ray diffraction. The microstructure of the cathode material was observed by SEM. The chemical forms of elements on the surface of cathode materials was analyzed by XPS.The electrochemical activity of the cathode material was analyzed by an AC impedance spectroscopy. The results show that the activation energy of oxygen reduction reaction decreases with the increase of Ca2+ doping content in La1-xCaxNi0.6Fe0.4O3-δcathode material, which is consistent with the DRT (Distribution of relaxation times) analysis. The La0.8Ca0.2Ni0.6Fe0.4O3-δcathode material has the lowest polarization resistance (0.88 Ωcm2) at 750℃, and exhibits more excellent oxygen catalytic activity than the undoped LNF material, making the LCNF cathode have a broader application prospect in IT-SOFC.

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谢满意,蔡长焜,安胜利,郜建全,薛柯. Ca掺杂LNF阴极材料的制备与电化学性能改善[J].稀有金属材料与工程,2020,49(9):3099~3106.[Manyi Xie, Changkun Cai, Shengli An, Jiangquan Gao, Ke Xue. Preparation and Electrochemical Performance Improvement of Alkaline Earth Metal Ca Doped LNF Cathode[J]. Rare Metal Materials and Engineering,2020,49(9):3099~3106.]
DOI:10.12442/j. issn.1002-185X.20190785

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  • 收稿日期:2019-09-24
  • 最后修改日期:2019-12-25
  • 录用日期:2020-01-03
  • 在线发布日期: 2020-10-15
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