Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

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Abstract

A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 °C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.
Original languageEnglish
Pages (from-to)1009 - 1015
JournalJournal of Power Sources
Volume274
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Seals
corrosion
Corrosion
Glass
glass
Phase interfaces
Hydrogen
air
Air
hydrogen
sealing
Electrolytes
manufacturing
electrolytes
microstructure
Microstructure
cells

Keywords

  • SOFC
  • seals
  • thermiculite 866
  • dual exposure
  • interconnect
  • post-experimental analysis
  • solid oxide fuel cells

Cite this

@article{d5de58c0e2374f868bb053a0397e1fb9,
title = "Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals",
abstract = "A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 °C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.",
keywords = "SOFC, seals, thermiculite 866, dual exposure, interconnect, post-experimental analysis, solid oxide fuel cells",
author = "Olivier Thomann and Markus Rautanen and Olli Himanen and Johan Tallgren and Jari Kiviaho",
note = "Project code: 75275",
year = "2015",
doi = "10.1016/j.jpowsour.2014.10.100",
language = "English",
volume = "274",
pages = "1009 -- 1015",
journal = "Journal of Power Sources",
issn = "0378-7753",
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TY - JOUR

T1 - Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

AU - Thomann, Olivier

AU - Rautanen, Markus

AU - Himanen, Olli

AU - Tallgren, Johan

AU - Kiviaho, Jari

N1 - Project code: 75275

PY - 2015

Y1 - 2015

N2 - A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 °C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.

AB - A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 °C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.

KW - SOFC

KW - seals

KW - thermiculite 866

KW - dual exposure

KW - interconnect

KW - post-experimental analysis

KW - solid oxide fuel cells

UR - http://urn.fi/URN:ISBN:978-951-38-8314-0

U2 - 10.1016/j.jpowsour.2014.10.100

DO - 10.1016/j.jpowsour.2014.10.100

M3 - Article

VL - 274

SP - 1009

EP - 1015

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -