Oxygen Transport at the Hetero Interfaces of Electrochemical Ceramic Devices

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

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The oxygen transports were investigated at the O2/cathode/Y 2O3-stabilized ZrO2 (YSZ) interfaces for solid oxide fuel cells(SOFCs). The isotope oxygen exchange technique ( 16O/18O exchange) and secondary ion mass spectrometry (SIMS) analysis were adopted to determine the active sites for oxygen adsorption, surface oxygen exchange, and incorporation of oxygen around the O2/cathode/YSZ triple phase boundaries (TPBs). The cathode surfaces were active for oxygen adsorption and surface oxygen exchange than the free surfaces of YSZ, which suggested the higher activity on the cathode surfaces. The active sites for oxygen incorporation were determined with mesh shape cathodes (La0.9Sr0.1MnO3 and Au) and porous cathode (Ag). The SIMS images clearly determined the active sites for oxygen incorporation on YSZ surfaces: the cathode/YSZ interfaces were active for oxygen incorporation as well as TPB in the La0.9Sr 0.1MnO3-mesh and the Ag-porous cathodes. On the other hand, only the TPB lines were active for oxygen incorporation in the Au-mesh. The expansion of active sites from the TPB was considered on the basis of the SIMS images. The bulk diffusion of oxygen was also investigated at the LaMnO3 film/YSZ samples.

Original languageEnglish
Pages (from-to)179-196
Number of pages18
JournalKey Engineering Materials
Volume253
Publication statusPublished - 2003 Jan 1
EventCeramic Interfaces: Properties and Applications V - Proceedings of the 5th International Workshop on Interfaces of Ceramic Materials - Tsukuba, Ibaraki, Japan
Duration: 2001 Oct 212001 Oct 25

Keywords

  • Electrochemical Devices
  • Isotopic Oxygen Exchange
  • Oxygen Transports
  • Secondary Ion Mass Spectroscopy SIMS
  • Solid Oxide Fuel Cell

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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