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Title: ZrO 2 atomic layer deposition into Sr 0.5Sm 0.5CoO 3-δ–Ce 0.9Gd 0.1O 2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement

Abstract

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: Sr 0.5Sm 0.5CoO 3-δ infiltrated into Gd-doped ceria, Ce 0.9Gd 0.1O 2-δ, scaffolds (SSC–GDC). Island-like ALD-ZrO 2 coatings with approximately monolayer coverage initially yield a higher electrode polarization resistance, R P, but thereafter the coated electrodes show lower R P 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-ZrO 2 showed an R P 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 SrZrO 3, Co 3O 4, and SmCoO 3. The low R P 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Northwestern Univ., Evanston, IL (United States). Materials Research Science and Engineering Center
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
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
OSTI Identifier:
1599213
Alternate Identifier(s):
OSTI ID: 1576680; OSTI ID: 1658929
Grant/Contract Number:  
SC0016965; OISE-1545907; ECCS-1542205; DMR-1720139; DMR-1121262
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 7; Journal Issue: 48; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Schmauss, Travis A., Railsback, Justin G., Lu, Matthew Y., Zhao, Kevin Y., and Barnett, Scott A. ZrO 2 atomic layer deposition into Sr0.5Sm0.5CoO3-δ–Ce0.9Gd0.1O2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement. United States: N. p., 2019. Web. doi:10.1039/c9ta09214e.
Schmauss, Travis A., Railsback, Justin G., Lu, Matthew Y., Zhao, Kevin Y., & Barnett, Scott A. ZrO 2 atomic layer deposition into Sr0.5Sm0.5CoO3-δ–Ce0.9Gd0.1O2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement. United States. https://doi.org/10.1039/c9ta09214e
Schmauss, Travis A., Railsback, Justin G., Lu, Matthew Y., Zhao, Kevin Y., and Barnett, Scott A. Mon . "ZrO 2 atomic layer deposition into Sr0.5Sm0.5CoO3-δ–Ce0.9Gd0.1O2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement". United States. https://doi.org/10.1039/c9ta09214e. https://www.osti.gov/servlets/purl/1599213.
@article{osti_1599213,
title = {ZrO 2 atomic layer deposition into Sr0.5Sm0.5CoO3-δ–Ce0.9Gd0.1O2-δ solid oxide fuel cell cathodes: mechanisms of stability enhancement},
author = {Schmauss, Travis A. and Railsback, Justin G. and Lu, Matthew Y. and Zhao, Kevin Y. and Barnett, Scott A.},
abstractNote = {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.},
doi = {10.1039/c9ta09214e},
url = {https://www.osti.gov/biblio/1599213}, journal = {Journal of Materials Chemistry. A},
issn = {2050-7488},
number = 48,
volume = 7,
place = {United States},
year = {2019},
month = {11}
}

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