Question

How to find open circuit voltage from linear sweep voltammetry?

Answer 1

linear sweep voltammetry (LSV) a fixed potential range is employed much like potential step measurements.The voltage scan rate (v) is calculated from the slope of the line. Clearly by changing the time taken to sweep the range we alter the scan rate. The characteristics of the linear sweep voltammogram recorded depend on a number of factors including:

The rate of the electron transfer reaction(s)
The chemical reactivity of the electroactive species
The voltage scan rate
In LSV measurements the current response is plotted as a function of voltage rather than time, unlike potential step measurements. For example if we return to the Fe3+/Fe2+ system

Fe(III)/Fe(II) redox couple

then the following voltammogram would be seen for a single voltage scan using an electrolyte solution containing only Fe3+ resulting from a voltage sweep