Optimisation of the Solid Oxide Fuel Cell (SOFC) cathode material Ca 3Co4O9-δ

Aurélie Rolle*, Samir Boulfrad, Kensaku Nagasawa, Hiroshi Nakatsugawa, Olivier Mentré, John Irvine, Sylvie Daviero-Minaud

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This paper focuses on the electrochemical potentialities of the 2D misfit compound Ca3Co4O9-δ, so far mainly investigated for its thermoelectric properties. Its expansion coefficient (TEC = (9-10) × 10-6 °C-1) and its chemical stability are compatible with standard CGO IT-electrolyte and the first optimisation steps of the deposited cathode have been performed with the aim to minimise the ASR and increase the cell durability. Particular attention has been paid on the effect of thickness and microstructure for pure and composite cathodes. The electrode reaction was performed on symmetrical cells. The preliminary results presented here show that the composite (70 wt.% Ca3Co 4O9-δ-30 wt.% CGO) gives the lowest ASR values compare to single-phased electrodes. Strikingly, the ASR values increase for thinner deposited layers. The effect of various current collectors (gold grid vs. platinum paste) has been also checked.

Original languageEnglish (US)
Pages (from-to)7328-7332
Number of pages5
JournalJournal of Power Sources
Volume196
Issue number17
DOIs
StatePublished - Sep 1 2011

Keywords

  • Cathode
  • Electrochemical impedance spectroscopy
  • Mixed ionic electronic conductor
  • Scanning electron microscopy
  • Solid oxide fuel cell

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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