Determination of adsorption capacitance and adsorption resistance in the process of anions adsorption
DOI:
https://doi.org/10.62638/ZasMat1744Abstract
In this work, adsorption processes of different anions onto Ag single crystals and poly crystals have been discussed and reviewed. Electrochemical Impedance Spectroscopy (EIS) and differential capacitance (Cdiff vs. w) measurements for all cases were presented. Fitting of experimental results was performed by using commercial software for fitting EIS results defined by Gamry Instruments Inc. (EIS 300), as well as by equation for Cdiff vs. w dependence. Cdiff vs. w dependence has been defined in several previous investigations for anion adsorption, containing Constant Phase Element (CPEdl), corresponding to the double layer capacitance (Cdl), connected in parallel with the adsorption capacitance (Cad) and adsorption resistance (Rad). It was shown that significant difference in parameters for anion adsorption obtained by both fitting procedures could be explained by the fact that in the EIS fitting analysis (presented either as Nyquist or Bode plot) two functions are fitted simultaneously, while in the case of Cdiff vs. w dependences only one function, containing all parameters of the equivalent circuit, is fitted.
Keywords:
Silver single crystals, anion adsorption mechanism, EIS, CPE, Cdiff vs. ohm dependenceReferences
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