Electrochemical charactarization and identification of reaction sites in oxide anodes

T. Nakamura, K. Yashiro, A. Kaimai, T. Otake, K. Sato, G. J. Park, T. Kawada, J. Mizusaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Anode performance and reaction sites on LaCrO3 based oxides, SrZrO3 based oxides, and ceria based oxides were evaluated by means of AC impedance and steady state polarization measurements in H 2-H2O-Ar gas mixtures. All oxide anodes tended to show poorer performance than Ni/YSZ cermet anode which is a popular anode for solid oxide fuel cells. Ceria based oxide showed relatively high performance among these oxides. Extraordinary large capacitance was observed in the LaCrO 3 based oxide and ceria based oxide anodes. The measured large capacitance is considered to be a kind of chemical capacitance due to oxygen nonstoichiometry of the electrode material. It means that the electrode reaction proceeds via O2- diffusion through the electrode particles, which is mixed ionic and electronic conductor. Further semi-quantitative analysis indicated that O2- diffuses through almost all particles in the electrode layer. The reaction site of hydrogen oxidation could be either distributed on the whole surface of the electrode particles or located at the interface of the current collector and the electrode layer. They also imply that Au current collector might act as a catalyst and is not appropriate for evaluation of oxide anodes.

Original languageEnglish
Title of host publicationAdvances in Solid Oxide Fuel Cells II - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
Pages193-198
Number of pages6
Edition4
Publication statusPublished - 2006 Dec 1
EventAdvances in Solid Oxide Fuel Cells II - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: 2006 Jan 222006 Jan 27

Publication series

NameCeramic Engineering and Science Proceedings
Number4
Volume27
ISSN (Print)0196-6219

Other

OtherAdvances in Solid Oxide Fuel Cells II - 30th International Conference on Advanced Ceramics and Composites
CountryUnited States
CityCocoa Beach, FL
Period06/1/2206/1/27

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Electrochemical charactarization and identification of reaction sites in oxide anodes'. Together they form a unique fingerprint.

Cite this