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Ohmic drop effect on measurements – Electrochemistry, Battery & Corrosion – Application Note 27

Latest updated: May 6, 2020

Abstract

Ohmic drop often refers to the potential induced by the resistance of the electrolyte or any other interface such as surface films or connectors. The consequence of the ohmic drop is that the potential applied by the instrument and the potential seen by the electrode are different. This has dramatic consequences on the type of response obtained from a system and can create errors in data analysis. These effects are described in this application note for voltammetry and impedance measurements.

 

Introduction

The ohmic drop (IR drop) describes the overpotential due to the electron flow through a material. In electrochemistry, it often refers to the potential induces by the resistance of the electrolyte or any other interface (Fig. 1) such as surface films or connectors [1]. For voltammetry on a given system, the applied potential, in presence of an ohmic drop, should abide by the following equation…

 

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