ليس باختصاصي ولكني اتابع هذة المواضيع العلمية

In voltammetry, you record I=f(t) at dV/dt = Cte.

To plot your Tafel curve, you just have to change the variables in the graph and plot U = f(ln(I)). If your software doesn't give you the opportunity to do so (but it should), you have to do it by hand.

The added value would be to better estimate the kinetic of the reaction you are studying.