Joining of solid oxide fuel/electrolysis cells at low temperature: A novel method to obtain high strength seals already at 300 °C

Xiaoqing Si, Jian Cao*, Ragnar Kiebach, Yu Xu, Huixia Xu, Belma Talic, Jicai Feng

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A novel method using a combination of surface three-dimensional structuring, silver nanoparticles and a silver-foam interlayer is developed for joining solid oxide fuel/electrolysis cell components at low temperature. Joints with a high mechanical strength of 24 MPa are obtained with this method already at 300 °C. The interfaces of a sealed assembly comprising ferritic stainless steel interconnect and nickel oxide-yttria stabilized zirconia (NiO-YSZ) support are analyzed by scanning electron microscopy and transmission electron microscopy to study the interfacial sintering mechanism. It is shown that the high strength of the joint is due to a combination of an optimized three-dimensional nickel/gold nanosheet array deposited on the substrates which facilitates mechanical interlocking, and a silver-foam interlayer which enhances the resistance to crack propagation. The long-term stability of the joint is evaluated by aging in a reducing atmosphere at 800 °C for 250 h. No defects indicating a possible failure are observed in the joint after this aging. An oxide layer forms along the silver/steel interface and parts of the steel are transformed to austenite due to nickel diffusion from the nanosheet array, but this does not deteriorate the joint stability.
Original languageEnglish
JournalJournal of Power Sources
Volume400
Pages (from-to)296-304
ISSN0378-7753
DOIs
Publication statusPublished - 2018

Keywords

  • Solid oxide fuel/electrolysis cells
  • Low temperature sealing
  • Nanosheet array
  • Silver-foam interlayer
  • Silver nanoparticle
  • Composite strengthening

Cite this

@article{fc44756d05ba4e7b8cdf5b35da78ef2e,
title = "Joining of solid oxide fuel/electrolysis cells at low temperature: A novel method to obtain high strength seals already at 300 °C",
abstract = "A novel method using a combination of surface three-dimensional structuring, silver nanoparticles and a silver-foam interlayer is developed for joining solid oxide fuel/electrolysis cell components at low temperature. Joints with a high mechanical strength of 24 MPa are obtained with this method already at 300 °C. The interfaces of a sealed assembly comprising ferritic stainless steel interconnect and nickel oxide-yttria stabilized zirconia (NiO-YSZ) support are analyzed by scanning electron microscopy and transmission electron microscopy to study the interfacial sintering mechanism. It is shown that the high strength of the joint is due to a combination of an optimized three-dimensional nickel/gold nanosheet array deposited on the substrates which facilitates mechanical interlocking, and a silver-foam interlayer which enhances the resistance to crack propagation. The long-term stability of the joint is evaluated by aging in a reducing atmosphere at 800 °C for 250 h. No defects indicating a possible failure are observed in the joint after this aging. An oxide layer forms along the silver/steel interface and parts of the steel are transformed to austenite due to nickel diffusion from the nanosheet array, but this does not deteriorate the joint stability.",
keywords = "Solid oxide fuel/electrolysis cells, Low temperature sealing, Nanosheet array, Silver-foam interlayer, Silver nanoparticle, Composite strengthening",
author = "Xiaoqing Si and Jian Cao and Ragnar Kiebach and Yu Xu and Huixia Xu and Belma Talic and Jicai Feng",
year = "2018",
doi = "10.1016/j.jpowsour.2018.08.046",
language = "English",
volume = "400",
pages = "296--304",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

Joining of solid oxide fuel/electrolysis cells at low temperature: A novel method to obtain high strength seals already at 300 °C. / Si, Xiaoqing ; Cao, Jian; Kiebach, Ragnar; Xu, Yu; Xu, Huixia; Talic, Belma; Feng, Jicai .

In: Journal of Power Sources, Vol. 400, 2018, p. 296-304.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Joining of solid oxide fuel/electrolysis cells at low temperature: A novel method to obtain high strength seals already at 300 °C

AU - Si, Xiaoqing

AU - Cao, Jian

AU - Kiebach, Ragnar

AU - Xu, Yu

AU - Xu, Huixia

AU - Talic, Belma

AU - Feng, Jicai

PY - 2018

Y1 - 2018

N2 - A novel method using a combination of surface three-dimensional structuring, silver nanoparticles and a silver-foam interlayer is developed for joining solid oxide fuel/electrolysis cell components at low temperature. Joints with a high mechanical strength of 24 MPa are obtained with this method already at 300 °C. The interfaces of a sealed assembly comprising ferritic stainless steel interconnect and nickel oxide-yttria stabilized zirconia (NiO-YSZ) support are analyzed by scanning electron microscopy and transmission electron microscopy to study the interfacial sintering mechanism. It is shown that the high strength of the joint is due to a combination of an optimized three-dimensional nickel/gold nanosheet array deposited on the substrates which facilitates mechanical interlocking, and a silver-foam interlayer which enhances the resistance to crack propagation. The long-term stability of the joint is evaluated by aging in a reducing atmosphere at 800 °C for 250 h. No defects indicating a possible failure are observed in the joint after this aging. An oxide layer forms along the silver/steel interface and parts of the steel are transformed to austenite due to nickel diffusion from the nanosheet array, but this does not deteriorate the joint stability.

AB - A novel method using a combination of surface three-dimensional structuring, silver nanoparticles and a silver-foam interlayer is developed for joining solid oxide fuel/electrolysis cell components at low temperature. Joints with a high mechanical strength of 24 MPa are obtained with this method already at 300 °C. The interfaces of a sealed assembly comprising ferritic stainless steel interconnect and nickel oxide-yttria stabilized zirconia (NiO-YSZ) support are analyzed by scanning electron microscopy and transmission electron microscopy to study the interfacial sintering mechanism. It is shown that the high strength of the joint is due to a combination of an optimized three-dimensional nickel/gold nanosheet array deposited on the substrates which facilitates mechanical interlocking, and a silver-foam interlayer which enhances the resistance to crack propagation. The long-term stability of the joint is evaluated by aging in a reducing atmosphere at 800 °C for 250 h. No defects indicating a possible failure are observed in the joint after this aging. An oxide layer forms along the silver/steel interface and parts of the steel are transformed to austenite due to nickel diffusion from the nanosheet array, but this does not deteriorate the joint stability.

KW - Solid oxide fuel/electrolysis cells

KW - Low temperature sealing

KW - Nanosheet array

KW - Silver-foam interlayer

KW - Silver nanoparticle

KW - Composite strengthening

U2 - 10.1016/j.jpowsour.2018.08.046

DO - 10.1016/j.jpowsour.2018.08.046

M3 - Journal article

VL - 400

SP - 296

EP - 304

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -