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Title: SrZrO 3 Formation at the Interlayer/Electrolyte Interface during (La 1-xSr x) 1-δCo 1-yFe yO 3 Cathode Sintering

Abstract

This work probes the formation of SrZrO 3 at the SDC/YSZ interface (Sm doped ceria, SDC; Y stabilized zirconia, YSZ) during (La 1-xSr x) 1-δCo1 -yFe yO 3 (LSCF) cathode sintering. SEM/EDS and grazing incidence X-ray diffraction results of annealed LSCF and YSZ samples reveal that even without physical contact between LSCF and YSZ, SrZrO 3 was formed on the surface of YSZ, preferentially at the grain boundaries. It was suspected that the SrZrO 3 formation is due to the Sr-containing gas species diffused through the pores of the SDC layer and reacted with the YSZ electrolyte. Computational thermodynamics was adopted to predict the gas species formed in air during sintering by using the La-Sr-Co-Fe-O-H thermodynamic database. Sr(OH) 2 is identified as the dominant Sr-containing gas species under the experimental conditions. In addition, it was found that A-site deficiency in LSCF could effectively suppress the SrZrO 3 formation while a dense and pore-free SDC interlayer is required to totally block the SrZrO 3 formation. As a result, cell performance was significantly improved for a cell with a dense SDC interlayer fabricated by pulsed laser deposition, due to elimination of SrZrO 3 formation and therefore reduced interfacial resistance.

Authors:
 [1];  [2];  [1];  [1];  [1];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Florida International Univ., Miami, FL (United States)
  3. Florida International Univ., Miami, FL (United States); Worcester Polytechnic Institute, Worcester, MA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390433
Report Number(s):
PNNL-SA-127510
Journal ID: ISSN 0013-4651; AA6040000
Grant/Contract Number:
AC05-76RL01830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 10; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; CALPHAD; Lanthanum strontium cobalt ferrite (LSCF); Solid oxide fuel cell (SOFC); SrZrO3 (SZO); Yttria stabilized zirconia (YSZ)

Citation Formats

Lu, Zigui, Darvish, Shadi, Hardy, John, Templeton, Jared, Stevenson, Jeffry, and Zhong, Yu. SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering. United States: N. p., 2017. Web. doi:10.1149/2.0141710jes.
Lu, Zigui, Darvish, Shadi, Hardy, John, Templeton, Jared, Stevenson, Jeffry, & Zhong, Yu. SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering. United States. doi:10.1149/2.0141710jes.
Lu, Zigui, Darvish, Shadi, Hardy, John, Templeton, Jared, Stevenson, Jeffry, and Zhong, Yu. 2017. "SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering". United States. doi:10.1149/2.0141710jes. https://www.osti.gov/servlets/purl/1390433.
@article{osti_1390433,
title = {SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering},
author = {Lu, Zigui and Darvish, Shadi and Hardy, John and Templeton, Jared and Stevenson, Jeffry and Zhong, Yu},
abstractNote = {This work probes the formation of SrZrO3 at the SDC/YSZ interface (Sm doped ceria, SDC; Y stabilized zirconia, YSZ) during (La1-xSrx)1-δCo1-yFeyO3 (LSCF) cathode sintering. SEM/EDS and grazing incidence X-ray diffraction results of annealed LSCF and YSZ samples reveal that even without physical contact between LSCF and YSZ, SrZrO3 was formed on the surface of YSZ, preferentially at the grain boundaries. It was suspected that the SrZrO3 formation is due to the Sr-containing gas species diffused through the pores of the SDC layer and reacted with the YSZ electrolyte. Computational thermodynamics was adopted to predict the gas species formed in air during sintering by using the La-Sr-Co-Fe-O-H thermodynamic database. Sr(OH)2 is identified as the dominant Sr-containing gas species under the experimental conditions. In addition, it was found that A-site deficiency in LSCF could effectively suppress the SrZrO3 formation while a dense and pore-free SDC interlayer is required to totally block the SrZrO3 formation. As a result, cell performance was significantly improved for a cell with a dense SDC interlayer fabricated by pulsed laser deposition, due to elimination of SrZrO3 formation and therefore reduced interfacial resistance.},
doi = {10.1149/2.0141710jes},
journal = {Journal of the Electrochemical Society},
number = 10,
volume = 164,
place = {United States},
year = 2017,
month = 7
}

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