In situ TEM analysis of a symmetric solid oxide cell in oxygen and vacuum–cation diffusion observations

Fabrizio Gualandris, Søren Bredmose Simonsen, Jakob Birkedal Wagner, Simone Sanna, S. Muto, Luise Theil Kuhn

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Abstract

In order to establish the use of solid oxide fuel/electrolysis cells (SOFC/SOEC) in the energy market, a deeper understanding of degradation effects during operation is necessary. This study apply in situ transmission electron microscopy (TEM) of a symmetric model cell composed by two oxygen electrodes of La0.6Sr0.4CoO3-δ (LSC) and an electrolyte, ZrO2: 8% mol Y2O3 (8YSZ), deposited on 1% Nb doped SrTiO3-δ (STN) single crystal substrate by pulsed laser deposition. The results showed a high cation mobility of the electrodes when exposed to 900 ºC. Cobalt is found to agglomerate at the interface between LSC and STN. Strontium depletion is observed in both electrodes. Finally, a faster grain growth occurs in LSC for the cell exposed to oxygen in comparison with the cell in vacuum.
Original languageEnglish
JournalECS Transactions
Volume75
Issue number42
Pages (from-to)123-133
ISSN1938-6737
DOIs
Publication statusPublished - 2017

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