Simulation of coarsening in three-phase solid oxide fuel cell anodes

Hsun Yi Chen, Hui Chia Yu, J. Scott Cronin, James R. Wilson, Scott A. Barnett, Katsuyo Thornton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

Coarsening of the nickel phase is known to occur in solid oxide fuel cell (SOFC) anodes consisting of Ni and yttria-stabilized zirconia (YSZ). However, the exact nature of the coarsening process is not known, nor how it affects three-phase boundaries (TPBs) and the resulting electrochemical performance. We apply a phase-field approach to simulate the microstructural evolution of Ni-YSZ anode functional layers. An experimentally obtained three-dimensional reconstruction of a functional layer from an anode-supported SOFC is used as the initial microstructure. The evolution of the microstructure is characterized quantitatively by examining the TPB density, interfacial area per unit volume, and tortuosity versus time. The assumed TPB contact angles are found to have a strong effect on the microstructural evolution; in particular, reducing the contact angle of nickel on YSZ yields less TPB reduction.

Original languageEnglish (US)
Pages (from-to)1333-1337
Number of pages5
JournalJournal of Power Sources
Volume196
Issue number3
DOIs
StatePublished - Feb 1 2011

Keywords

  • Coarsening
  • Nickel
  • Phase-field model
  • Solid oxide fuel cell
  • Three-phase boundary
  • Yttria-stabilized zirconia

ASJC Scopus subject areas

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

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