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固体氧化物燃料电池La0.6Sr0.4Co0.2Fe0.8-xScxO3-?阴极材料的晶体结构与电化学性能
作者:
作者单位:

1.内蒙古科技大学材料与冶金学院;2.内蒙古包头市昆都仑区阿尔丁大街7号

中图分类号:

TM911.4 ??????????????

基金项目:

国家自然科学基金项目（51974167）；内蒙古自治区高等学校创新团队发展计划支持（No.NMGIRT2215）


Crystal structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8-xScxO3-? cathode materials for solid oxide fuel cell
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国家自然科学基金项目（51974167）；内蒙古自治区高等学校创新团队发展计划支持（No.NMGIRT2215）

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    摘要:

    采用溶胶-凝胶法合成了Sc掺杂La0.6Sr0.4Co0.2Fe0.8-xScxO3-?(LSCFScx, x=0, 0.04, 0.08)阴极粉体，系统分析了LSCFSc阴极材料的晶体结构、表面元素化学形态、催化活性及电化学性能。XRD结果表明，LSCF为立方结构，Sc3+掺杂后LSCFSc阴极材料由立方相向六方结构转变。LSCFSc阴极材料的电导率随着Sc3+的掺杂而降低，在300-800 ℃温度范围内LSCFSc0.08阴极样品的电导率仍大于100 S/cm。XPS结果表明Sc3+掺杂提高了LSCFSc阴极材料表面吸附氧(OAds)的含量，LSCFSc0.08阴极材料在800℃测得的极化面电阻RASR为0.026 Ω·cm2，相比LSCF阴极材料RASR降低了约87.6%，显著改善了LSCFSc阴极材料对氧气的吸附/解离能力，提升了对氧气的催化活性。以Ni-SDC为阳极材料，SDC为电解质，LSCFSc0.08为阴极材料组装成Ni-SDC|SDC|LSCFSc0.08阳极支撑型单电池，在800℃时最大功率密度为806mW/cm2，表明Sc3+掺杂可以显著提升阴极材料的电化学性能。

    Abstract:

    The Sc-doped La0.6Sr0.4Co0.2Fe0.8-XScxO3-? (LSCFScx, x=0, 0.04, 0.08) cathode powders were synthesized by a sol-gel method. The crystal structure, chemical morphology of surface elements, catalytic activity and electrochemical properties of LSCFSc cathode material were systematically analyzed.XRD results show that LSCF has a cubic structure, and the LSCFSc cathode material changes from cubic to hexagonal structure.The conductivity of LSCFSc cathode material decreases with the Sc3+-doping, and the conductivity of LSCFSc0.08 cathode sample is still greater than 100 S/cm in the temperature range of 300-800.XPS results show that Sc3+-doping increases the content of adsorbed oxygen (OAds) on the surface of LSCFSc cathode material, and the RASR of polarization surface of LSCFSc0.08 cathode material measured at 800℃ is 0.026 Ω·cm2, which is about 87.6% lower than RASR of LSCF cathode material, which significantly improved the adsorption/dissociation ability of LSCFSc cathode material to oxygen, and enhanced the catalytic activity of oxygen.Ni-SDC as the anode material, SDC as electrolyte, and LSCFSc0.08 as cathode material assembled into Ni-SDC|SDC|LSCFSc0.08 anode-support single cell, the maximum power density is 806 mW/cm2 at 800 ℃, indicating that Sc3+-doping can significantly improved the electrochemical performance of cathode materials.

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蔡长焜,谢满意,王林,薛柯,彭军,包金小,安胜利.固体氧化物燃料电池La0.6Sr0.4Co0.2Fe0.8-xScxO3-?阴极材料的晶体结构与电化学性能[J].稀有金属材料与工程,2023,52(2):601~608.[caichangkun, xiemanyi, wanglin, xueke, pengjun, baojinxiao, anshengli. Crystal structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8-xScxO3-? cathode materials for solid oxide fuel cell[J]. Rare Metal Materials and Engineering,2023,52(2):601~608.]
DOI：10.12442/j. issn.1002-185X.20220008

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  • 收稿日期:2022-01-05
  • 最后修改日期:2022-03-06
  • 录用日期:2022-03-28
  • 在线发布日期: 2023-03-09
  • 出版日期: 2023-02-28

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