Electrode reaction and microstructure of La0.6Sr0.4CoO3-δ thin films

Maya Sase, Junji Suzuki, Keiji Yashiro, Takanori Otake, Atsushi Kaimai, Tatsuya Kawada, Junichiro Mizusaki, Hiroo Yugami

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Dense La0.6Sr0.4CoO3-δ film electrodes were deposited by pulsed laser deposition (PLD) on Ce0.9Gd0.1O1.95 electrolytes. The grain size of one film was 300-500 nm, and the other was 30-50 nm. DC polarization and AC impedance measurements were performed at 873 K-1073 K in O2-Ar gas mixtures. From investigations of the electrochemical capacitances, the rate determining process for both electrodes were confirmed to be the surface reaction. The analyses in the electrochemical resistance revealed that the oxygen adsorption/desorption rate was faster on the electrode with smaller grain size. DC responses agreed with AC results, so the current density on the nano-grain electrode was larger by half an order than those of the sub-micron-grain electrode. Under a dilute oxygen atmosphere, the rate determining step transferred from a surface reaction to a gas phase diffusion.

Original languageEnglish
Pages (from-to)1961-1964
Number of pages4
JournalSolid State Ionics
Volume177
Issue number19-25 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 15

Keywords

  • (La,Sr)CoO
  • Nano-crystalline
  • Oxygen exchange
  • Pulsed laser deposition
  • SOFC cathode

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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