# Computational Approach to Fast Analysis of Electrochemical Impedance Spectroscopy

## TL;DR

This paper presents a fast computational method for analyzing electrochemical impedance spectroscopy data using a custom algorithm in C on OriginPro.

## Contribution

A new C-based fitting algorithm integrated into OriginPro for faster and automated EIS analysis is introduced.

## Key findings

- The algorithm avoids data import/export, significantly speeding up the analysis process.
- An automated fitting procedure with initial parameter assignment was successfully implemented.
- Custom error functions produced results comparable to reference software in two case studies.

## Abstract

Electrochemical Impedance Spectroscopy (EIS) is a widely used technique for characterizing the electrode–electrolyte interface. EIS analysis can be very complex and tedious. In this work, a fitting algorithm written in C is implemented on OriginPro software to avoid the data import/export operation and speed up the analysis. An automated fitting procedure that assigns the initial parameters is implemented for the simplest equivalent circuit. In addition, the possibility of using a custom error function is explored, with results comparable to that of reference software. The developed algorithm is tested on two different case studies.