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EIS Zfit – Electrochemistry, Battery & corrosion – Application Note 18

Latest updated: May 6, 2020

Abstract

In this application note, automation of successive ZFit analyses within EC-Lab are demonstrated on staircase potentio EIS (SPEIS) experiments, as well as repetitive potentio EIS (PEIS) acquired at different times on non-stationary electrochemical systems. In both types of EIS experiments, successive experiments are performed using a simplified protocol, creating the need for equivalent circuit analysis on each one. ZFit provides a selection for “all cycles” to be analyzed within a given experiment, and plots the successive values for each component in the selected model for an even deeper analysis. The same process can also be applied to Galvano EIS as well as SGEIS.

 

Introduction

It is sometimes useful to automate measurements. With EC-Lab® and EC-Lab® Express, it is possible to automatically perform successive impedance measure-ments during a potential sweep with the SPEIS (Staircase Potentio Electrochemical Impe-dance Spectroscopy) technique. This technique allows the user to carry out different potential steps in the same experiment and, for each one, perform an electrochemical impedance spectroscopy measurement. For each experiment, the user defines the conditions. The main application of this technique is to study electrochemical reaction kinetics along steady-state curves. Note that the same process can be used in galvanostatic mode with the SGEIS technique

 

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