Interpretation of the impedance comprising negative capacitance and constant phase elements on iron electrode in weakly acidic media |
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Authors: | V V Elkin A I Marshakov A A Rybkina M A Maleeva |
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Institution: | 1.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The negative low-frequency capacitance that appears in interpretations of impedance of the iron electrode in weakly acidic
solutions is shown to arise in the case of interaction of two consecutive nonequilibrium flows that constitute a two-stage
anodic faradaic process of intermediate adsorption in the prepassivation potential range. The low-frequency capacitance is
negative throughout a potential range where the logarithm of rate constant vs. potential (logk vs. E) dependence has the higher slope for the limiting stage. The low-frequency capacitance becomes positive at higher anodic
potentials and for the other limiting stage. |
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