Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O                         3                          cathodes on Yttria-stabilized zirconia electrolytes

Justin Railsback; Sun Hee Choi; Scott A. Barnett

doi:10.1016/j.ssi.2019.02.020

Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O ₃ cathodes on Yttria-stabilized zirconia electrolytes

Justin Railsback, Sun Hee Choi, Scott A. Barnett^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

This paper presents a detailed study of the effectiveness of Gd-doped Ceria (GDC) barrier layers for preventing reactions between La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O ₃ (LSCF) cathodes and Yttria-stabilized Zirconia (YSZ) electrolytes. The GDC barrier layers, which are reasonably dense as produced by a novel process where the GDC and YSZ are co-fired at 1250 °C, were varied in thickness from 1.5 to 6 μm. No measureable Sr transport occurs across the GDC layer of any thickness for a relatively low LSCF firing temperature of 1000 °C, or for thickness ≥ 4.5 μm at any firing temperature. Sr was detected at the GDC/YSZ interface for thinner barriers and higher firing temperatures, in the form of a discontinuous SrZrO ₃ phase. This zirconate phase forms preferentially at pores and grain boundaries in the GDC layer, probably indicating that these were pathways for relatively fast Sr transport. Atom probe tomography results indicated segregation of impurities to grain boundaries near the GDC/YSZ interface.

Original language	English (US)
Pages (from-to)	74-81
Number of pages	8
Journal	Solid State Ionics
Volume	335
DOIs	https://doi.org/10.1016/j.ssi.2019.02.020
State	Published - Jul 2019

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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@article{ef85e3cbc58042c2849bb62c01623ab3,

title = " Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O 3 cathodes on Yttria-stabilized zirconia electrolytes ",

abstract = " This paper presents a detailed study of the effectiveness of Gd-doped Ceria (GDC) barrier layers for preventing reactions between La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) cathodes and Yttria-stabilized Zirconia (YSZ) electrolytes. The GDC barrier layers, which are reasonably dense as produced by a novel process where the GDC and YSZ are co-fired at 1250 °C, were varied in thickness from 1.5 to 6 μm. No measureable Sr transport occurs across the GDC layer of any thickness for a relatively low LSCF firing temperature of 1000 °C, or for thickness ≥ 4.5 μm at any firing temperature. Sr was detected at the GDC/YSZ interface for thinner barriers and higher firing temperatures, in the form of a discontinuous SrZrO 3 phase. This zirconate phase forms preferentially at pores and grain boundaries in the GDC layer, probably indicating that these were pathways for relatively fast Sr transport. Atom probe tomography results indicated segregation of impurities to grain boundaries near the GDC/YSZ interface. ",

author = "Justin Railsback and Choi, {Sun Hee} and Barnett, {Scott A.}",

note = "Funding Information: The authors gratefully acknowledge financial support from the U.S. Department of Energy ( DE-FE0023407 ). Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph at NUCAPT was purchased and upgraded with grants from the NSF-MRI (DMR-0420532) and ONR-DURIP (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. NUCAPT received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. ",

year = "2019",

month = jul,

doi = "10.1016/j.ssi.2019.02.020",

language = "English (US)",

volume = "335",

pages = "74--81",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O ₃ cathodes on Yttria-stabilized zirconia electrolytes . / Railsback, Justin; Choi, Sun Hee; Barnett, Scott A.

In: Solid State Ionics, Vol. 335, 07.2019, p. 74-81.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O 3 cathodes on Yttria-stabilized zirconia electrolytes

AU - Railsback, Justin

AU - Choi, Sun Hee

AU - Barnett, Scott A.

N1 - Funding Information: The authors gratefully acknowledge financial support from the U.S. Department of Energy ( DE-FE0023407 ). Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph at NUCAPT was purchased and upgraded with grants from the NSF-MRI (DMR-0420532) and ONR-DURIP (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. NUCAPT received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University.

PY - 2019/7

Y1 - 2019/7

N2 - This paper presents a detailed study of the effectiveness of Gd-doped Ceria (GDC) barrier layers for preventing reactions between La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) cathodes and Yttria-stabilized Zirconia (YSZ) electrolytes. The GDC barrier layers, which are reasonably dense as produced by a novel process where the GDC and YSZ are co-fired at 1250 °C, were varied in thickness from 1.5 to 6 μm. No measureable Sr transport occurs across the GDC layer of any thickness for a relatively low LSCF firing temperature of 1000 °C, or for thickness ≥ 4.5 μm at any firing temperature. Sr was detected at the GDC/YSZ interface for thinner barriers and higher firing temperatures, in the form of a discontinuous SrZrO 3 phase. This zirconate phase forms preferentially at pores and grain boundaries in the GDC layer, probably indicating that these were pathways for relatively fast Sr transport. Atom probe tomography results indicated segregation of impurities to grain boundaries near the GDC/YSZ interface.

AB - This paper presents a detailed study of the effectiveness of Gd-doped Ceria (GDC) barrier layers for preventing reactions between La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) cathodes and Yttria-stabilized Zirconia (YSZ) electrolytes. The GDC barrier layers, which are reasonably dense as produced by a novel process where the GDC and YSZ are co-fired at 1250 °C, were varied in thickness from 1.5 to 6 μm. No measureable Sr transport occurs across the GDC layer of any thickness for a relatively low LSCF firing temperature of 1000 °C, or for thickness ≥ 4.5 μm at any firing temperature. Sr was detected at the GDC/YSZ interface for thinner barriers and higher firing temperatures, in the form of a discontinuous SrZrO 3 phase. This zirconate phase forms preferentially at pores and grain boundaries in the GDC layer, probably indicating that these were pathways for relatively fast Sr transport. Atom probe tomography results indicated segregation of impurities to grain boundaries near the GDC/YSZ interface.

UR - http://www.scopus.com/inward/record.url?scp=85062280892&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062280892&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2019.02.020

DO - 10.1016/j.ssi.2019.02.020

M3 - Article

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VL - 335

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JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

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