应用化学 ›› 2022, Vol. 39 ›› Issue (5): 797-808.DOI: 10.19894/j.issn.1000-0518.210148

• 研究论文 • 上一篇    下一篇

Pr0.8Sr0.2Fe0.7Ni0.3O3-δ -Pr1.2Sr0.8Ni0.6Fe0.4O4+δ 复合阴极的制备及其电化学性能

孟玉, 张晴, 彭文浩, 朱晓飞(), 周德凤()   

  1. 长春工业大学化学与生命科学学院,长春 130012
  • 收稿日期:2021-03-26 接受日期:2021-07-19 出版日期:2022-05-01 发布日期:2022-05-24
  • 通讯作者: 朱晓飞,周德凤
  • 基金资助:
    国家自然科学基金(21471022);吉林省科学基金(20190201230JC);吉林省教育厅“十三五科技研究计划”(JJKH20200647KJ)

Preparation and Electrochemical Performance of Pr0.8Sr0.2Fe0.7Ni0.3O3-δ ⁃Pr1.2Sr0.8Ni0.6Fe0.4O4+δ Composite Cathode

Yu MENG, Qing ZHANG, Wen-Hao PENG, Xiao-Fei ZHU(), De-Feng ZHOU()   

  1. School of Chemistry and Life Science,Changchun University of Technology,Changchun 130012,China
  • Received:2021-03-26 Accepted:2021-07-19 Published:2022-05-01 Online:2022-05-24
  • Contact: Xiao-Fei ZHU,De-Feng ZHOU
  • About author:defengzhou65@126.com
    zhuxiaofei@ccut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21471022);Jilin Provincial Science Research Foundation of China(20190201230JC);the 13th Five?Year Plan for Science & Technology Research is sponsored by Department of Education of Jilin Province(JJKH20200647KJ)

摘要:

采用溶胶凝胶法制备单相Pr0.8Sr0.2Fe0.7Ni0.3O3-δ (PSFN113)和Pr1.2Sr0.8Ni0.6Fe0.4O4+δ (PSNF214),并将二者以3∶7的质量比固态混合制备PSFN113-PSNF214异质复合阴极,系统地研究异质界面的存在对样品的结构和性能的影响,并评估PSFN113-PSNF214复合材料作为中温固体氧化物燃料电池(IT-SOFC)阴极的潜力。结果表明,异质复合材料的两相间具有良好的化学稳定性和热稳定性,与Ce0.8Gd0.2O1.9(GDC)电解质具有良好的兼容性和界面粘附性,具有长期运行稳定性。PSNF113加入到PSFN214中形成异质结构,可提高氧空位含量,改善PSFN113的氧离子传输。两相颗粒紧密缠绕以最大化形成异质界面,提高比表面积。800 ℃时,PSFN113-PSNF214的极化电阻值为0.053 Ω·cm2,仅为PSFN113的41%和PSNF214的61%;相应单电池的最大功率密度为496.80 mW/cm2,高达PSFN113的2.5倍和PSNF214的1.6倍。60 h长期稳定性测试的电压衰减率仅为0.07%/h。因此,PSFN113-PSNF214异质复合阴极优异的性能和杰出的稳定性,使其可作为IT-SOFC阴极的候选材料。

关键词: 中温固体氧化物燃料电池, 无钴复合阴极, 异质界面, 电化学性能

Abstract:

Single-phase Pr0.8Sr0.2Fe0.7Ni0.3O3-δ (PSFN113) and Pr1.2Sr0.8Ni0.6Fe0.4O4+δ (PSNF214) were prepared via a sol-gel method, and the PSFN113-PSNF214 heterogeneous composite cathode was prepared via mixing the two components with the mass ratio of 3∶7. The effects of hetero-interface on the structure and properties of the samples were systematically studied, and the potential of PSFN113-PSNF214 as an IT-SOFC(intermediate temperature solid oxide fuel cell) cathode was evaluated. The results show that the two phases of the heterogeneous composite material has good chemical and thermal stability. In addition, the heterogeneous composite material has good compatibility and interfacial adhesion with the GDC(Ce0.8Gd0.2O1.9) electrolyte, so it has long-term operating stability. Meanwhile, PSNF113 is added to PSFN214 to form a heterogeneous mixture, which can increase the oxygen vacancy content and improve the oxygen ion transmission of PSFN113. In addition, two-phase particles are tightly entangled to maximize the formation of hetero-interfaces and increase the specific surface area. At 800 ℃, the polarization resistance of PSFN113-PSNF214 is 0.053 Ω·cm2, which is only 41% of PSFN113's resistance and 61% of PSNF214's resistance. The maximum power density of the corresponding single cell is 496.80 mW/cm2, which is 2.5 times of PSFN113's densityand 1.6 times of PSNF214's density. The voltage decay rate after 60 h long-term stability test is only 0.07%/h. Therefore, the excellent performance and outstanding stability of PSFN113-PSNF214 heterogeneous composite cathode make it a candidate material for IT-SOFC cathode.

Key words: Intermediate-temperature solid oxide fuel cell, Cobalt-free composite cathode, Hetero-interface, Electrochemical performance

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