Application notes 20 min read

CV Sim: Simulation of simple redox reaction (E) Part 2 Ohmic drop effect & double layer capacitance – Application Note 41-2

Latest updated: August 31, 2021

Abstract

This second part of this application note is aimed at illustrating the effect of ohmic drop and double layer capacitance on the general shape of an I vs. E curve. As in the first part of the note, the simplest case is described (E mechanism and one species in solution).
The effects of the ohmic drop and of the double-layer capacitance on the shape of the I vs. E curve of a single electron redox reaction was studied using CV Sim. In the case where both an ohmic drop and a double layer capacitance are present, their values can be determined using the current response. All these aspects can be simulated by CV Sim, which makes CV Sim a very useful tool for teaching purposes.

 

Introduction

In part I, we described how and which kinetic information could be deduced from the analysis of the voltammetry curves
obtained at various scan rates. This second part aims at illustrating the effect of ohmic drop and double layer capacitance on the general shape of an I vs. E curve. Similarly, to the first part of the note, the simplest case is described: a) the reaction is a simple redox reaction, b) only the oxidizing species is present in the solution, c) only linear voltammetry is performed.

 

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