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