Combined electrochemical and X-ray tomography study of the high temperature evolution of Nickel - Yttria Stabilized Zirconia solid oxide fuel cell anodes

David Kennouche, Yu Chen Karen Chen-Wiegart, Casey Riscoe, Jun Wang, Scott A. Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Accelerated ageing of Ni-Yttria Stabilized Zirconia (YSZ) anode functional layers (AFLs) in solid oxide fuel cells (SOFCs) is carried out at 1000-1200°C, the resulting morphological changes are investigated using transmission X-ray microscopy (TXM), and properties are characterized using electrochemical impedance spectroscopy (EIS). Prior to ageing, the as prepared NiO-YSZ AFLs are reduced to Ni-YSZ and then aged at 1100°C for 100 h in order to eliminate early-stage morphological changes. Measured particle size and three phase boundary (TPB) density changes with ageing time and temperature are fit reasonably well using a power-law coarsening model. This model is also used in conjunction with an electrochemical model to predict changes in the anode charge-transfer polarization resistance. The models are used to make predictions of the structural and electrochemical performance evolution of these Ni-YSZ anodes, for cells operated long-term at normal (700-850°C) operating temperatures. Additional experiments to verify the model predictions are suggested.

Original languageEnglish (US)
Pages (from-to)604-612
Number of pages9
JournalJournal of Power Sources
Volume307
DOIs
StatePublished - Mar 1 2016

Keywords

  • Anode
  • Model
  • Polarization resistance
  • Solid oxide fuel cell
  • Temperature evolution
  • Three phase boundaries

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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