Electrocatalytic properties of an Sr0.25Bi0.5FeO3-delta/LSGM interface

Citation
Sh. Wang et al., Electrocatalytic properties of an Sr0.25Bi0.5FeO3-delta/LSGM interface, J SOL ST EL, 5(6), 2001, pp. 375-381
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
ISSN journal
1432-8488 → ACNP
Volume
5
Issue
6
Year of publication
2001
Pages
375 - 381
Database
ISI
SICI code
1432-8488(200108)5:6<375:EPOASI>2.0.ZU;2-D
Abstract
Sr0.25Bi0.5FeO3 (delta) (SBF) has been studied as a cathode material for lo w- and intermediate-temperature (600-850 degreesC) solid oxide fuel cells ( SOFCs) based on the La0.9Sr0.9Ga0.9Mg0.1O3 (LSGM) electrolyte. The observed cathodic current density passing through an SBF/LSGM interface at 840 degr eesC in pure oxygen is about 1 A . cm(-2) at an overpotential of 40 mV, muc h higher than that for an LaxSr1-xMnO3 electrode under similar conditions r eported in the literature. Analysis indicates that the electrode kinetics i s 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.