Temporal and thermal evolutions of surface Sr-segregation in pristine and atomic layer deposition modified La0.6Sr0.4CoO3-δ epitaxial films

Wen, Yeting; Yang, Tianrang; Lee, Dongkyu; Lee, Ho Nyung; Crumlin, Ethan J.; Huang, Kevin

doi:10.1039/c8ta08355j

Title: Temporal and thermal evolutions of surface Sr-segregation in pristine and atomic layer deposition modified La_0.6Sr_0.4CoO_3-δ epitaxial films

Journal Article · 15 November 2018 · Journal of Materials Chemistry. A

DOI: https://doi.org/10.1039/c8ta08355j · OSTI ID:1491297

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Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering
Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Sciences and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Sciences and Technology Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source

The bulk-to-surface Sr segregation can seriously compromise the stability of oxygen electrocatalysis in La_1-xSr_xCoO_3-δ and limit its practical applications such as in solid oxide fuel cells. We show via in situ ambient pressure X-ray photoelectron spectroscopy (APXPS) that the surface Sr-segregation is a kinetically fast process and the equilibrium surface Sr-concentration follows Arrhenius law from 250 to 520 °C at a fixed p_O₂ = 1 × 10^-3 atm. We also show that application of a nanoscaled, atomic layer deposition (ALD) derived ZrO₂ overcoat can effectively suppress the Sr-segregation by reducing the surface concentration of oxygen vacancies. Electrochemical impedance spectroscopy (EIS) study further confirms that the ALD-ZrO₂-coated LSCo epitaxial film exhibits a much lower and more stable polarization resistance than the uncoated one at 550 °C for >300 hours, suggesting that Sr-segregation is the source of the higher resistance.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF) (United States)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1491297

Alternate ID(s):: OSTI ID: 1656484; OSTI ID: 1482846

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 47 Vol. 6; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Temporal and thermal evolutions of surface Sr-segregation in pristine and atomic layer deposition modified La_0.6Sr_0.4CoO_3-δ epitaxial films