In-situ formed Ce0.8Gd0.2O1.9 barrier layers on yttria stabilized zirconia backbones by infiltration - A promising path to high performing oxygen electrodes of solid oxide cell

Simona Ovtar, Ming Chen, Alfred Junio Samson, Wolff-Ragnar Kiebach

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Oxygen electrodes for solid oxide cells were prepared by a consecutive infiltration of a gadolinium doped ceria (Ce0.8Gd0.2O1.9, CGO) barrier layer and a lanthanum cobalt nickelate (La0.95Co0.4Ni0.6O3, LCN) electro catalyst layer into a porous yttrium doped zirconia (YSZ) backbone. The influences of the following parameters on the microstructure of the formed CGO barrier layer and on the electrochemical performance of the cells were studied: i) surfactants and wetting agents, ii) ceria/gadolinia coverage, iii) calcination profiles and iv) exposure temperature during testing. The infiltration process of the CGO barrier layer was optimized and a slow, pH controlled decomposition of urea containing precursor solutions was found to be most effective. For these cells a decrease of 84% in the polarization resistance (Rp) was achieved compared to cells without a barrier layer. Furthermore, a better initial performance and only a small increase of the cell-resistance with increasing exposure temperatures during testing were obtained. A complete and homogenous covering of the YSZ backbone with Ce0.8Gd0.2O1.9 was found to be necessary to maintain high performance also at higher exposure temperatures (> 800 °C).
Original languageEnglish
JournalSolid State Ionics
Volume304
Pages (from-to)51-59
ISSN0167-2738
DOIs
Publication statusPublished - 2017

Keywords

  • Infiltration
  • Barrier layer
  • Electro-catalyst
  • Solid oxide fuel cell
  • Cathode

Cite this

@article{19dc2d4d6136484f99f24a97bc53136f,
title = "In-situ formed Ce0.8Gd0.2O1.9 barrier layers on yttria stabilized zirconia backbones by infiltration - A promising path to high performing oxygen electrodes of solid oxide cell",
abstract = "Oxygen electrodes for solid oxide cells were prepared by a consecutive infiltration of a gadolinium doped ceria (Ce0.8Gd0.2O1.9, CGO) barrier layer and a lanthanum cobalt nickelate (La0.95Co0.4Ni0.6O3, LCN) electro catalyst layer into a porous yttrium doped zirconia (YSZ) backbone. The influences of the following parameters on the microstructure of the formed CGO barrier layer and on the electrochemical performance of the cells were studied: i) surfactants and wetting agents, ii) ceria/gadolinia coverage, iii) calcination profiles and iv) exposure temperature during testing. The infiltration process of the CGO barrier layer was optimized and a slow, pH controlled decomposition of urea containing precursor solutions was found to be most effective. For these cells a decrease of 84{\%} in the polarization resistance (Rp) was achieved compared to cells without a barrier layer. Furthermore, a better initial performance and only a small increase of the cell-resistance with increasing exposure temperatures during testing were obtained. A complete and homogenous covering of the YSZ backbone with Ce0.8Gd0.2O1.9 was found to be necessary to maintain high performance also at higher exposure temperatures (> 800 °C).",
keywords = "Infiltration, Barrier layer, Electro-catalyst, Solid oxide fuel cell, Cathode",
author = "Simona Ovtar and Ming Chen and Samson, {Alfred Junio} and Wolff-Ragnar Kiebach",
year = "2017",
doi = "10.1016/j.ssi.2017.03.019",
language = "English",
volume = "304",
pages = "51--59",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

In-situ formed Ce0.8Gd0.2O1.9 barrier layers on yttria stabilized zirconia backbones by infiltration - A promising path to high performing oxygen electrodes of solid oxide cell. / Ovtar, Simona; Chen, Ming; Samson, Alfred Junio; Kiebach, Wolff-Ragnar.

In: Solid State Ionics, Vol. 304, 2017, p. 51-59.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - In-situ formed Ce0.8Gd0.2O1.9 barrier layers on yttria stabilized zirconia backbones by infiltration - A promising path to high performing oxygen electrodes of solid oxide cell

AU - Ovtar, Simona

AU - Chen, Ming

AU - Samson, Alfred Junio

AU - Kiebach, Wolff-Ragnar

PY - 2017

Y1 - 2017

N2 - Oxygen electrodes for solid oxide cells were prepared by a consecutive infiltration of a gadolinium doped ceria (Ce0.8Gd0.2O1.9, CGO) barrier layer and a lanthanum cobalt nickelate (La0.95Co0.4Ni0.6O3, LCN) electro catalyst layer into a porous yttrium doped zirconia (YSZ) backbone. The influences of the following parameters on the microstructure of the formed CGO barrier layer and on the electrochemical performance of the cells were studied: i) surfactants and wetting agents, ii) ceria/gadolinia coverage, iii) calcination profiles and iv) exposure temperature during testing. The infiltration process of the CGO barrier layer was optimized and a slow, pH controlled decomposition of urea containing precursor solutions was found to be most effective. For these cells a decrease of 84% in the polarization resistance (Rp) was achieved compared to cells without a barrier layer. Furthermore, a better initial performance and only a small increase of the cell-resistance with increasing exposure temperatures during testing were obtained. A complete and homogenous covering of the YSZ backbone with Ce0.8Gd0.2O1.9 was found to be necessary to maintain high performance also at higher exposure temperatures (> 800 °C).

AB - Oxygen electrodes for solid oxide cells were prepared by a consecutive infiltration of a gadolinium doped ceria (Ce0.8Gd0.2O1.9, CGO) barrier layer and a lanthanum cobalt nickelate (La0.95Co0.4Ni0.6O3, LCN) electro catalyst layer into a porous yttrium doped zirconia (YSZ) backbone. The influences of the following parameters on the microstructure of the formed CGO barrier layer and on the electrochemical performance of the cells were studied: i) surfactants and wetting agents, ii) ceria/gadolinia coverage, iii) calcination profiles and iv) exposure temperature during testing. The infiltration process of the CGO barrier layer was optimized and a slow, pH controlled decomposition of urea containing precursor solutions was found to be most effective. For these cells a decrease of 84% in the polarization resistance (Rp) was achieved compared to cells without a barrier layer. Furthermore, a better initial performance and only a small increase of the cell-resistance with increasing exposure temperatures during testing were obtained. A complete and homogenous covering of the YSZ backbone with Ce0.8Gd0.2O1.9 was found to be necessary to maintain high performance also at higher exposure temperatures (> 800 °C).

KW - Infiltration

KW - Barrier layer

KW - Electro-catalyst

KW - Solid oxide fuel cell

KW - Cathode

U2 - 10.1016/j.ssi.2017.03.019

DO - 10.1016/j.ssi.2017.03.019

M3 - Journal article

VL - 304

SP - 51

EP - 59

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -