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Accuracy of Determining Electrode Properties from Impedance Measurements
Author(s) -
Despić Aleksandar R.,
Jović Vladimir D.,
Djorović Mihajlo V.
Publication year - 1979
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197900007
Subject(s) - chemistry , perchloric acid , electrode , electrical impedance , capacitance , platinum , electrochemistry , analytical chemistry (journal) , standard hydrogen electrode , microelectrode , thermodynamics , reference electrode , inorganic chemistry , chromatography , electrical engineering , engineering , catalysis , biochemistry , physics
An attempt is made to estimate the accuracy which can be achieved in the evaluation of parameters of an electrode with an activation controlled electrochemical process from measurements of electrode impedance. Ferrous/ferric couple at platinum in perchloric acid was taken as a model system and the impedance components have been measured as functions of frequency at different concentrations. Double layer capacitance, C DL , faradaic resistance, θ, and the ohmic resistance of the cell R , have been identified from the characteristic functions, and the indeterminacies in their values evaluated from the probable errors of measurements. The problem of indeterminacy was generalized and regions in the C DL – θ – R space were defined outside which those parameters cannot be determined within present limits of accuracy.