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


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.

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Wang, S., Lu, X. & Liu, M. Electrocatalytic properties of an Sr0.25Bi0.5FeO3– δ/LSGM interface. J Solid State Electrochem 5, 375–381 (2001).

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  • Oxygen reduction Cathode Mechanism Mixed conductor SOFCs