Electrochemical Impedance Spectroscopy Applied in Theoretical Model of Exclusion Zone

Abstract

Electrochemical Impedance Spectroscopy (EIS) is a prevailing modern technique to depict electric properties of materials. The present work related to in exploring the exclusion zone properties by using theoretical equivalent model and measured data. The dielectrics properties of distilled water in contact with hydrophilic material revealed that at the interfaces metal, hydrophilic surface has a different time constant values. At the interfaces, water molecules are pointing as H-up and H-down either towards or away from the surface to form structures and layers closely packed with each other. The H-up and H-down have a significant difference in the work function with metal interaction. The data acquisition system uses LabVIEW and myDaq hardware, in integration with MATLAB via OPC communication. When comparing fitted model and equivalent circuit the equation system presents nonlinearity. A simple usage of a Levenberg-Marquardt algorithm to solve the system was not coherent with expected responses of the theoretical impedance system, motivation to make a process that quantifies MSE (Mean Squared Error) between fitted data and solved system. Promising results rises when applying nafion on both sides of electrodes at room temperature and at fusion. One can expect that with a low impedance less would be the disorder, which is the probability of having structured water.