Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (5): 797-808.DOI: 10.19894/j.issn.1000-0518.210148

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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)

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

CLC Number: