Understanding the thermo-mechanical behaviour of solid oxide fuel cell anodes using synchrotron X-ray diffraction

T. M.M. Heenan, J. B. Robinson, X. Lu, B. Tjaden, A. Cervellino, J. J. Bailey, D. J.L. Brett, P. R. Shearing*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The formation of cermet materials via the addition of electrolyte ceramic to metal-based electrodes has become widely adopted in solid oxide fuel cell fabrication due to its benefits in maximizing triple-phase boundary densities, whilst mitigating bulk thermal expansion mismatch between electrode and electrolyte layers. This work improves thermo-mechanical understanding via examination of nickel-based anode materials using synchrotron X-ray diffraction; two cermet materials are studied: Ni-YSZ and Ni-GDC, with comparison to a ceramic-free Ni sample. Findings conclude that although the ceramic addition has minor effects on the cubic Ni structure within isothermal environments, stress induced by the different thermal properties within the cermet materials results in a shifted Ni thermal expansion peak on passing the Curie point. Moreover, extended cycling of the Ni-YSZ sample suggests that low-temperature operation (ca. 600 °C) may require several thermal cycles, or extended dwell times, to alleviate residual Ni stresses, this has potential implications for SOFC design and operation strategies.

Original languageEnglish
Pages (from-to)156-164
Number of pages9
JournalSolid State Ionics
Volume314
Early online date26 Nov 2017
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • Curie temperature
  • Degradation
  • Ni-YSZ
  • SOFC
  • XRD

ASJC Scopus subject areas

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

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