Numerical Simulation of the SrZrO3 Formation in Solid Oxide Fuel Cells

Kaiming Cheng, Huixia Xu, Lijun Zhang, Yong Du, Jixue Zhou, Shouqiu Tang, Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The Ce1−xGdxO2−δ (CGO) interlayer is a common reaction barrier layer employed in solid oxide fuel cells (SOFCs), to prevent chemical reactions between the (La1−xSrx)(Co1−yFey)O3−δ (LSCF) cathode and the Y2O3-stabilized ZrO2 (YSZ) electrolyte. However, even with the existence of the CGO layer, formation of SrZrO3 (SZO) insulating phase can still take place, causing cell degradation. Considering there have already been a large amount of experimental investigations conducted on the above degradation phenomenon, the current work is attempting to numerically model the process. A simplified numerical model of SZO formation at the YSZ–CGO interface is constructed. Based on the thermodynamic information and diffusion kinetics of the YSZ–CGO–LSCF system from the literature, the interdiffusion between YSZ and CGO, the Sr diffusion through the CGO layer, and the formation of SZO at the YSZ–CGO interface are modelled, reproducing the experimental data well. Limitations of the current modeling work are further discussed.
Original languageEnglish
JournalJournal of Electronic Materials
Volume48
Issue number9
Pages (from-to)5510-5515
Number of pages6
ISSN0361-5235
DOIs
Publication statusPublished - 2019

Keywords

  • Solid oxide fuel cells
  • Cathode degradation
  • YSZ–CGO interdiffusion
  • SrZrO3 formation
  • Numerical simulation

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