Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 40, Issue 11, Pages 1223-1226Publisher
PLEIADES PUBLISHING INC
DOI: 10.1023/B:RUEL.0000048659.28543.0c
Keywords
solid-oxide fuel cells; polarization resistance; electrical double layer; electrochemical reaction; convolution equation; iteration algorithm; cermet coatings
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Transformation of impedance spectra into relaxation time spectra (RTS) is used for determining contributions of individual processes of the oxygen electroreduction reaction (OER) to the polarization resistance of the electrochemical cell. The transformation technique involves the solution of the convolution equation found with the aid of a modified Van Cittert iteration algorithm checked on model impedance spectra. The technique, when used to analyze impedance spectra of electrochemical cells air\Pt\YSZ\YSZ + Ptlair, shows that the conversion of a globular structure of the YSZ + Pt cermet layer to a columnar one is accompanied by a change of peak amplitudes in RTS. The revealed RTS dynamics when heated to 750degreesC is compared with peculiarities of individual processes in OER.
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