FTIR STUDY OF THE OXYGEN REDUCTION REACTIONS ONSm0.5Sr0.5CoO3

Qi-Hui Wu (), Harry Abernathy, Zhe Cheng and Meilin Liu
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Qi-Hui Wu: Semiconductor Photonics Research Center, Department of Physics, Xiamen University, Xiamen 361005, China
Harry Abernathy: Center for Innovative Fuel Cell and Battery Technologies, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Zhe Cheng: Center for Innovative Fuel Cell and Battery Technologies, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Meilin Liu: Center for Innovative Fuel Cell and Battery Technologies, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Surface Review and Letters (SRL), 2007, vol. 14, issue 04, 587-591

Abstract: The oxygen reduction on solid oxide fuel cell cathode electrode,Sm0.5Sr0.5CoO3, was studied by using emission Fourier transform infrared spectroscopy (FTIR). Superoxide$(O_{2}^{-})$species was detected with appearance of an IR peak at wavenumber about 1124 cm-1. Moreover, we interpreted for the first time that there would be a close relationship between the baseline shift of IR spectra and the oxygen vacancy concentration (OVC) of the samples. The downward baseline shift of IR spectra is due to the decrease of OVC in the bulk, while, the increase of the OVC in the bulk would cause the upward baseline shift.

Keywords: Oxygen reduction reactions; FTIR; SOFC; cathodes (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07009712

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