Non-linear impedance for a two-step electrode reaction with an intermediate adsorbed species
作者： J.-P. Diard , B. Le Gorrec , C. Montella
DOI: 10.1016/S0013-4686(96)00206-X
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摘要: The influence of electrochemical system non-linearity on impedance measurement is considered for a two-step reaction with an intermediate adsorbed species. Theoretical expressions the non-linear polarization resistance and charge transfer are derived corresponding, respectively, to low frequency high sinusoidal modulation electrode potential. A formal integration procedure used obtain response perturbation, whatever input signal frequency, and, from fundamental component response, derive admittance expressions. Tests carried out check validity theoretical results, firstly using limiting finally solving numerically kinetic equations. perturbation amplitude diagram studied. predictions invalidate previous derivations found in literature.
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