I am using potentiostat (CHI 660) to perform tafel analysis in three electrode mode, which can provide tafel slope for both electrodes and intercepts and corrosion current. There are different equations for determining (i.) exchange current density , however the simplified equation (attached) contain activation over potential or number of electrons (n). how to calculate these two parameters and exchange current density. The condition are double chamber fuel cell.
Branimir N. Grgur
Dear Jafar,
the Tafel line is a straight line of the polarization curve in E-log(j) plot E = n+Er, where n is the overpotential and Er reversible electrode potential. So by extrapolating Tafel line to Er or n the current is exchange current, see attached graph
Gretings
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