Surface states and stability of Fe-containing perovskite electrodes for SOFCs/SOECs by conversion-electron Mossbauer spectroscopy

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.

keywords

OXYGEN NONSTOICHIOMETRY; MIXED CONDUCTIVITY; ANODE MATERIAL; SOFC; TRANSPORT; MN; BA; LA; SM

subject category

Electrochemistry

authors

Tsipis, EV; Waerenborgh, JC; Kharton, VV

our authors

Groups

acknowledgements

This work was supported by the FCT, Portugal (projects PTDC/CTM/64357/2006, PTDC/CTM-CER/114561/2009 and SFRH/BPD/28629/2006).

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".