Methods using derivatives of chronopotentiograms

In principle, compensation of capacitive effects can be 100 per cent. The optimal pulse duration seems to be about 1 s. 

A theoretical description of this experiment has to take into account the existence of a faradaic current during the first pulse. For small values of t, one obtains, for only O or R present, the equation 

Double current steps, where the second step reverts to the initial value of the applied current, have been used in mechanistic studies11. 

If we consider reversible and irreversible systems, the derivatives dE/dt are easily obtained and are 

By measuring dE/dt we can calculate the transition time, t. The usefulness of these expressions is that they permit the determination of r in a region where the capacitive contribution is small (in fact at its minimum). 

---