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In Situ Analytical Electron Microscopy Studies of Redox Reactions at a YSZ/Pt Interface

Published online by Cambridge University Press:  29 May 2012

Amir Hossein Tavabi ,
Shigeo Arai  and
Takayoshi Tanji
Amir Hossein Tavabi*
Affiliation:
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
Shigeo Arai
Affiliation:
EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
Takayoshi Tanji
Affiliation:
EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
*
Corresponding author. E-mail: tavabi@esi.nagoya-u.ac.jp
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Abstract

Redox reactions were studied at a single yttria-stabilized zirconia (YSZ)/Pt electrode interface, in parallel with pure YSZ with no catalyst electrode, by in situ analytical electron microscopy at elevated temperatures and in an oxygen atmosphere. In situ electron holography showed that the oxide underwent reduction at elevated temperatures in a vacuum and was consequently reoxidized upon exposure to an oxygen flux at the same temperature. In situ energy loss spectroscopy measurements were in agreement with in situ electron holography observations and indicated that the oxidation state of the host cation zirconium was altered in the reduced state of the YSZ to the metastable state Zr3+.

Keywords

in situ electron holographyredox reactionsin situ EELSsolid oxide fuel cellYSZ/Pt interfaceFIB
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 18 , Issue 3 , June 2012 , pp. 538 - 544
Copyright
Copyright © Microscopy Society of America 2012

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