Imaging of oxygen transport at SOFC cathode/electrolyte interfaces by a novel technique

Teruhisa Horita, Katsuhiko Yamaji, Natsuko Sakai, Yueping Xiong, Tohru Kato, Harumi Yokokawa, Tatsuya Kawada

Research output: Contribution to journalConference articlepeer-review

92 Citations (Scopus)

Abstract

Oxygen transport was examined around the O2/cathode/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells (SOFCs). To visualize the kinetics of oxygen transport, isotope oxygen exchange (16O/18O exchange) and secondary ion mass spectrometry analysis (SIMS) were adopted for La0.85Sr0.15MnO3-mesh and gold (Au)-mesh cathodes. The mesh cathode surfaces promoted oxygen adsorption and surface oxygen exchange. Oxygen bulk diffusion in the mesh cathode was observed only at the La0.85Sr0.15MnO3-mesh. The active sites for oxygen incorporation were compared at the YSZ surfaces after removing the mesh cathodes. The La0.85Sr0.15MnO3-mesh/YSZ interface can be the active site for oxygen incorporation as well as the triple phase boundary (TPB). On the other hand, the Au/YSZ interface showed low 18O concentration, and the active sites were limited to the TPB lines. Most active sites for oxygen incorporation were the O2/cathode/YSZ interface (TPB) for La0.85Sr0.15MnO3-mesh and Au-mesh from the line analysis of the SIMS images. The expansion of the oxygen incorporation active site around the TPB was discussed on the basis of SIMS imaging analysis and electrochemical analysis.

Original languageEnglish
Pages (from-to)224-230
Number of pages7
JournalJournal of Power Sources
Volume106
Issue number1-2
DOIs
Publication statusPublished - 2002 Apr 1
Event7th Grove Fuel Cell Symposium, Grove VII - London, United Kingdom
Duration: 2001 Sep 112001 Sep 13

Keywords

  • Cathode reaction
  • Isotope oxygen exchange
  • O/O exchange
  • Oxygen transport
  • Secondary ion mass spectrometry (SIMS)

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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