Surface states and stability of Fe-containing perovskite electrodes for SOFCs/SOECs by conversion-electron Mossbauer spectroscopy
authors Tsipis, EV; Waerenborgh, JC; Kharton, VV
nationality International
journal ELECTROCHEMISTRY COMMUNICATIONS
author keywords Solid oxide fuel cell anode; Steam electrolysis; Perovskite-type oxide electrode; Mg-doped (La,Sr)(Cr,Fe)O(3-delta); Redox stability
keywords OXYGEN NONSTOICHIOMETRY; MIXED CONDUCTIVITY; ANODE MATERIAL; SOFC; TRANSPORT; MN; BA; LA; SM
abstract Conversion-electron Mossbauer spectroscopy analysis of model electrochemical cells, comprising porous (57)Fe-enriched (La(0.9)Sr(0.1))(0.98)Cr(0.6)Fe(0.3)Mg(0.1)O(3-delta) electrodes and lanthanum gallate solid electrolyte, showed no reductive decomposition of the perovskite electrode material in H(2)-containing atmosphere at 1073 K, even in the steam electrolysis regime. The predominant state of iron cations in the electrode surface layers was found to remain trivalent irrespective of the oxygen partial pressure in surrounding atmosphere and polarization, whilst oxygen coordination of Fe(3+) decreases on lowering electrode potential. (C) 2011 Elsevier By. All rights reserved.
publisher ELSEVIER SCIENCE INC
issn 1388-2481
year published 2011
volume 13
issue 7
beginning page 685
ending page 688
digital object identifier (doi) 10.1016/j.elecom.2011.04.009
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000292713600007
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journal impact factor 4.333
5 year journal impact factor 4.555
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