Triple phase boundary specific pathway analysis for quantitative characterization of solid oxide cell electrode microstructure

Peter Stanley Jørgensen, Søren Lyng Ebbehøj, Anne Hauch

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Abstract

The density and percolation of Triple phase boundary sites are important quantities in analyzing microstructures of solid oxide fuel cell electrodes from tomography data. However, these measures do not provide descriptions of the quality of the TPB sites in terms of the length and radius of the pathways through which they can be reached. New methods for performing TPB specific pathway analysis on 3D image data are introduced, analyzing the pathway properties of each TPB site in the electrode structure. The methods seek to provide additional information beyond whether the TPB sites are percolating or not by also analyzing the pathway length to the TPB sites and the bottleneck radius of the pathway. We show how these methods can be utilized in quantifying and relating the TPB specific results to cell test data of an electrode reduction protocol study for Ni/Scandia-and-Yttria-doped-Zirconia (Ni/ScYSZ) anodes. A study of the TPB density and particle size distribution alone did not provide an explanation for the differences observed in electrode performance. However, the analysis of pathway lengths to the TPBs and the bottleneck radii to reach these TPB sites provided valuable microstructural insight that supported the findings from the electrochemical characterization of the Ni/ScYSZ anodes.
Original languageEnglish
JournalJournal of Power Sources
Volume279
Pages (from-to)686-693
Number of pages8
ISSN0378-7753
DOIs
Publication statusPublished - 2015

Keywords

  • 3D
  • Characterization
  • Microstructure
  • Solid oxide cell
  • Triple phase boundary
  • Anodes
  • Fuel cells
  • Nickel
  • Particle size
  • Particle size analysis
  • Phase boundaries
  • Solid oxide fuel cells (SOFC)
  • Solvents
  • Electrochemical characterizations
  • Electrode performance
  • Electrode reduction
  • Electrode structure
  • Protocol studies
  • Quantitative characterization
  • Solid-oxide cells
  • Electrodes

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