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Title: ZrO 2 atomic layer deposition into Sr0.5Sm0.5CoO3-δ–Ce0.9Gd0.1O2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c9ta09214e· OSTI ID:1599213

The application of atomic layer deposition (ALD) on solid oxide fuel cell (SOFC) cathodes has previously yielded mixed results and has been seen to depend on the ALD species, catalyst chemistry, catalyst morphology, and the conditions for deposition. Illustrated here is the effect of an ALD zirconia coating within an SOFC oxygen electrode: Sr0.5Sm0.5CoO3-δ infiltrated into Gd-doped ceria, Ce0.9Gd0.1O2-δ, scaffolds (SSC–GDC). Island-like ALD-ZrO2 coatings with approximately monolayer coverage initially yield a higher electrode polarization resistance, RP, but thereafter the coated electrodes show lower RP and slower degradation. For example, after~1000 hour accelerated ageing tests carried out at 750 °C, SSC–GDC coated with ~0.3 nm of ALD-ZrO2 showed an RP increase of 18% compared to 30% for uncoated SSC–GDC. Strontium surface segregation was not found to be a significant degradation factor. At 750 °C, a reaction between the Zr-overlayer and the SSC was observed, producing SrZrO3, Co3O4, and SmCoO3. The low RP values achieved indicate that the reactant products were thin enough to be discontinuous and thus not hinder the oxygen surface exchange process, and yet they acted as a barrier to SSC particle coarsening.

Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); Keck Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0016965; OISE-1545907; ECCS-1542205; DMR-1720139; DMR-1121262
OSTI ID:
1599213
Alternate ID(s):
OSTI ID: 1576680; OSTI ID: 1658929
Journal Information:
Journal of Materials Chemistry. A, Vol. 7, Issue 48; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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