Studies of solid oxide fuel cell electrode evolution using 3D tomography

K. Yakal-Kremski*, J. S. Cronin, Y. C.K. Chen-Wiegart, J. Wang, S. A. Barnett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This paper describes 3D tomographic investigations of the structural evolution of Ni-yttria-stabilized zirconia (Ni-YSZ) and (La,Sr)MnO 3-YSZ (LSM-YSZ) composite solid oxide fuel cell (SOFC) electrodes. Temperatures higher than normally used in SOFC operation are utilized to accelerate electrode evolution. Quantitative 3D FIB-SEM and X-ray tomographic imaging contributes to development of mechanistic evolution models needed to accurately predict long-term durability. Ni-YSZ anode functional layers annealed in humidified hydrogen at 900-1,100°C exhibited microstructural coarsening leading to a decrease in three-phase boundary (TPB) density. There was also a change in the fraction of pores that were isolated, which impacted the density of electrochemically active TPBs. The polarization resistance of optimally fired LSM-YSZ electrodes increased upon thermal aging at 1,000°C, whereas that of under-fired electrodes decreased upon aging. These results are explained in terms of observed 3D microstructural changes.

Original languageEnglish (US)
Pages (from-to)449-454
Number of pages6
JournalFuel Cells
Volume13
Issue number4
DOIs
StatePublished - Aug 2013

Keywords

  • Degradation
  • Electrode
  • SOFC
  • Solid Oxide Fuel Cell
  • Three Dimensional Tomography

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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