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Journal of Solid State Electrochemistry

, Volume 5, Issue 6, pp 375–381 | Cite as

Electrocatalytic properties of an Sr0.25Bi0.5FeO3– δ/LSGM interface

  • Shizhong Wang
  • Xinyu Lu
  • Meilin Liu
Original Paper

Abstract.

Sr0.25Bi0.5FeO3– δ (SBF) has been studied as a cathode material for low- and intermediate-temperature (600–850 °C) solid oxide fuel cells (SOFCs) based on the La0.9Sr0.1Ga0.9Mg0.1O3 (LSGM) electrolyte. The observed cathodic current density passing through an SBF/LSGM interface at 840 °C in pure oxygen is about 1 A·cm–2 at an overpotential of 40 mV, much higher than that for an LaxSr1–xMnO3 electrode under similar conditions reported in the literature. Analysis indicates that the electrode kinetics is controlled primarily by mass transfer at high temperatures and by charge transfer at low temperatures. The inductive loops of the impedance spectra further suggest that the adsorption of intermediate species is involved in the interfacial reaction.

Oxygen reduction Cathode Mechanism Mixed conductor SOFCs 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Shizhong Wang
    • 1
  • Xinyu Lu
    • 1
  • Meilin Liu
    • 1
  1. 1.School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

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