Impact of pore microstructure evolution on polarization resistance of Ni-Yttria-stabilized zirconia fuel cell anodes

J. Scott Cronin, James R. Wilson, Scott A Barnett

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

Temperature induced degradation in Solid Oxide Fuel Cell (SOFC) Ni-YSZ anodes was studied using both impedance spectroscopy and three-dimensional tomography via Focused Ion Beam-Scanning Electron Microscopy. A 100 h anneal at 1100 °C caused a 90% increase in cell polarization resistance, which correlated with the observed factor of ∼2 reduction in the electrochemically active three-phase boundary (TPB) density. The TPB decrease was caused by a significant decrease in pore percolation, and a reduction in pore interfacial area due to pores becoming larger and more equiaxed. The anneal caused no measurable change in average Ni particle size; Ni coarsening was apparently highly constrained in these anodes due to the relatively large YSZ volume fraction and low pore volume.

Original languageEnglish (US)
Pages (from-to)2640-2643
Number of pages4
JournalJournal of Power Sources
Volume196
Issue number5
DOIs
StatePublished - Mar 1 2011

Keywords

  • 3D
  • Degradation
  • FIB-SEM
  • Microstructure
  • Ni-YSZ
  • SOFC

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Impact of pore microstructure evolution on polarization resistance of Ni-Yttria-stabilized zirconia fuel cell anodes'. Together they form a unique fingerprint.

Cite this