Performance and Durability of Reversible Solid Oxide Cells with Nano-electrocatalysts Infiltrated Electrodes

Miao Yu, Xiaofeng Tong*, Bhaskar Reddy Sudireddy, Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This work focuses on improving the durability of Ni/yttria-stabilized zirconia (YSZ) fuel electrode-supported solid oxide cells under the reversible operation mode by infiltrating nano-sized electrocatalysts into both electrodes. The resulting cell consists of a CGO (Gd-doped CeO2) scaffold-based oxygen electrode that is infiltrated with LSC (La0.6Sr0.4CoO3-δ) and CGPO (Gd, Pr-co-doped CeO2) nanocomposite infiltrates and a Ni/YSZ fuel electrode modified with nano-CGO infiltrates. Constant-current tests at + 0.5 A/cm2 and − 0.5 A/cm2 are carried out, followed by cycling between fuel-cell and electrolysis modes at ± 0.5 A/cm2 and ± 1.25 A/cm2. Under the reversible operation at ± 0.5 A/cm2, the cell showed lower degradation rates than under the single mode operation, with cell voltage degradation of 1.23%/kh in fuel cell mode and 0.53%/kh in electrolysis mode. During the cycling operation at ± 1.25 A/cm2, the overall degradation rate under the electrolysis mode was only 0.46%/kh. Compared to the previously tested cells with only LSC infiltrated oxygen electrodes, the cell tested in this work shows better durability with degradation rates of less than half of the previous tests. The results in this work demonstrate that infiltrating nano-electrocatalysts into both electrodes is an effective solution to boost cell performance and durability under reversible operation.
Original languageEnglish
JournalJOM
Volume74
Issue number12
Pages (from-to)4495-4505
Number of pages11
ISSN1047-4838
DOIs
Publication statusPublished - 2022

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