On the Properties and Long-Term Stability of Infiltrated Lanthanum Cobalt Nickelates (LCN) in Solid Oxide Fuel Cell Cathodes

Wolff-Ragnar Kiebach, Philipp Zielke, Sune Veltzé, Simona Ovtar, Yu Xu, Søren Bredmose Simonsen, Kawai Kwok, Henrik Lund Frandsen, Rainer Küngas

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Infiltration as a fabrication method for solid oxide fuel cells (SOFC) electrodes is offering significant improvements in cell performance at reduced materials and fabrication costs, especially when combined with co-sintering. However, important questions regarding the long-term performance and microstructural stability remain unanswered. Here, we present the results of a three-year project, where large footprint anode-supported SOFCs with a co-sintered cathode backbone and infiltrated La0.95Co0.4Ni0.6O3 (LCN) cathodes were developed and thoroughly characterized. The initial long-term performance and stability of this new cell type was investigated for 1500+ hours, coupled with STEM-EDS investigation of the microstructural changes in the infiltrated electrodes. Additionally, electrodes were further aged at elevated temperatures (750 - 900°C) for periods reaching up to 5000 hours, while following changes in the electrode properties using SEM, BET area, and in-plane conductivity measurements. Finally, the mechanical properties of co-sintered cathode backbone cells were determined in four-point bending tests carried out both at room temperature and at 800°C in air. Based on these results, degradation mechanisms were identified and recommendation for safe operation conditions in real life application could be formulated.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume164
Issue number7
Pages (from-to)F748-F758
ISSN0013-4651
DOIs
Publication statusPublished - 2017

Bibliographical note

This was Paper 2895 presented at the Honolulu, Hawaii, Meeting of the Society, October 2–7, 2016.

Cite this

@article{346d6d123a8e476ea8c0a7d889a02b8d,
title = "On the Properties and Long-Term Stability of Infiltrated Lanthanum Cobalt Nickelates (LCN) in Solid Oxide Fuel Cell Cathodes",
abstract = "Infiltration as a fabrication method for solid oxide fuel cells (SOFC) electrodes is offering significant improvements in cell performance at reduced materials and fabrication costs, especially when combined with co-sintering. However, important questions regarding the long-term performance and microstructural stability remain unanswered. Here, we present the results of a three-year project, where large footprint anode-supported SOFCs with a co-sintered cathode backbone and infiltrated La0.95Co0.4Ni0.6O3 (LCN) cathodes were developed and thoroughly characterized. The initial long-term performance and stability of this new cell type was investigated for 1500+ hours, coupled with STEM-EDS investigation of the microstructural changes in the infiltrated electrodes. Additionally, electrodes were further aged at elevated temperatures (750 - 900°C) for periods reaching up to 5000 hours, while following changes in the electrode properties using SEM, BET area, and in-plane conductivity measurements. Finally, the mechanical properties of co-sintered cathode backbone cells were determined in four-point bending tests carried out both at room temperature and at 800°C in air. Based on these results, degradation mechanisms were identified and recommendation for safe operation conditions in real life application could be formulated.",
author = "Wolff-Ragnar Kiebach and Philipp Zielke and Sune Veltz{\'e} and Simona Ovtar and Yu Xu and Simonsen, {S{\o}ren Bredmose} and Kawai Kwok and Frandsen, {Henrik Lund} and Rainer K{\"u}ngas",
note = "This was Paper 2895 presented at the Honolulu, Hawaii, Meeting of the Society, October 2–7, 2016.",
year = "2017",
doi = "10.1149/2.0361707jes",
language = "English",
volume = "164",
pages = "F748--F758",
journal = "Journal of The Electrochemical Society",
issn = "0013-4651",
publisher = "The Electrochemical Society",
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}

On the Properties and Long-Term Stability of Infiltrated Lanthanum Cobalt Nickelates (LCN) in Solid Oxide Fuel Cell Cathodes. / Kiebach, Wolff-Ragnar; Zielke, Philipp; Veltzé, Sune; Ovtar, Simona; Xu, Yu; Simonsen, Søren Bredmose; Kwok, Kawai; Frandsen, Henrik Lund; Küngas, Rainer.

In: Journal of the Electrochemical Society, Vol. 164, No. 7, 2017, p. F748-F758.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - On the Properties and Long-Term Stability of Infiltrated Lanthanum Cobalt Nickelates (LCN) in Solid Oxide Fuel Cell Cathodes

AU - Kiebach, Wolff-Ragnar

AU - Zielke, Philipp

AU - Veltzé, Sune

AU - Ovtar, Simona

AU - Xu, Yu

AU - Simonsen, Søren Bredmose

AU - Kwok, Kawai

AU - Frandsen, Henrik Lund

AU - Küngas, Rainer

N1 - This was Paper 2895 presented at the Honolulu, Hawaii, Meeting of the Society, October 2–7, 2016.

PY - 2017

Y1 - 2017

N2 - Infiltration as a fabrication method for solid oxide fuel cells (SOFC) electrodes is offering significant improvements in cell performance at reduced materials and fabrication costs, especially when combined with co-sintering. However, important questions regarding the long-term performance and microstructural stability remain unanswered. Here, we present the results of a three-year project, where large footprint anode-supported SOFCs with a co-sintered cathode backbone and infiltrated La0.95Co0.4Ni0.6O3 (LCN) cathodes were developed and thoroughly characterized. The initial long-term performance and stability of this new cell type was investigated for 1500+ hours, coupled with STEM-EDS investigation of the microstructural changes in the infiltrated electrodes. Additionally, electrodes were further aged at elevated temperatures (750 - 900°C) for periods reaching up to 5000 hours, while following changes in the electrode properties using SEM, BET area, and in-plane conductivity measurements. Finally, the mechanical properties of co-sintered cathode backbone cells were determined in four-point bending tests carried out both at room temperature and at 800°C in air. Based on these results, degradation mechanisms were identified and recommendation for safe operation conditions in real life application could be formulated.

AB - Infiltration as a fabrication method for solid oxide fuel cells (SOFC) electrodes is offering significant improvements in cell performance at reduced materials and fabrication costs, especially when combined with co-sintering. However, important questions regarding the long-term performance and microstructural stability remain unanswered. Here, we present the results of a three-year project, where large footprint anode-supported SOFCs with a co-sintered cathode backbone and infiltrated La0.95Co0.4Ni0.6O3 (LCN) cathodes were developed and thoroughly characterized. The initial long-term performance and stability of this new cell type was investigated for 1500+ hours, coupled with STEM-EDS investigation of the microstructural changes in the infiltrated electrodes. Additionally, electrodes were further aged at elevated temperatures (750 - 900°C) for periods reaching up to 5000 hours, while following changes in the electrode properties using SEM, BET area, and in-plane conductivity measurements. Finally, the mechanical properties of co-sintered cathode backbone cells were determined in four-point bending tests carried out both at room temperature and at 800°C in air. Based on these results, degradation mechanisms were identified and recommendation for safe operation conditions in real life application could be formulated.

U2 - 10.1149/2.0361707jes

DO - 10.1149/2.0361707jes

M3 - Journal article

VL - 164

SP - F748-F758

JO - Journal of The Electrochemical Society

JF - Journal of The Electrochemical Society

SN - 0013-4651

IS - 7

ER -