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A Study of the Electrocatalytic Properties of SrCo0.8Fe0.2O3-δ by Impedance Spectroscopy

Published online by Cambridge University Press:  16 February 2011

Al Quoc Pham  and
Allan J. Jacobson
Al Quoc Pham
Affiliation:
University of Houston, Department of Chemistry and Texas Center for Superconductivity, Houston, TX 77204-5641
Allan J. Jacobson
Affiliation:
University of Houston, Department of Chemistry and Texas Center for Superconductivity, Houston, TX 77204-5641
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Abstract

The electrocatalytic behavior of the mixed electron - ion conductor SrCo0.8Fe0.2O3-δ, in the form of an electrode on YSZ, has been studied using impedance spectroscopy at low frequencies. The results suggest that the electrode process is dominated by the surface exchange at high temperatures and by the bulk oxygen diffusion at lower temperatures. No limiting current was observed in I-V measurements. The electrode polarization decreased with increasing current density. The creation of additonal oxygen vacancies in the electrode material is suggested to account for the better performance at the higher current densities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 389
Copyright
Copyright © Materials Research Society 1995

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