Derivative and differential voltammetry and reciprocal derivative chronopotentiometry - Identical behavior verification for electrode reversible processes

In the present paper, we carry out the experimental verification of the ana logy between the responses obtained in derivative and differential voltamme tric techniques and those corresponding to a new modality of the reciprocal derivative chronopotentiometric techniques using a programmed current of t he form I(t) = I(0)t(u) with u greater than or equal to -1/2. Identical inf ormation can be obtained from derivative voltammetry and reciprocal derivat ive chronopotentiometry although the experimental application of the latter is simpler and signals obtained are less noise influenced due to the use o f programmed current. In order to show the above mentioned analogy in the c ase of reversible electrode processes, we have carried out an experimental study of the systems Fe(C2O4)(3)(3-) in 0.2 M K2C2O4 (pH 4.49) at a static mercury drop electrode and ferrocene in CH3CN/0.25 M PF6NBu4 at a Pt electr ode. (C) 2000 The Electrochemical Society. S0013-4651(00)03-032-9. All righ ts reserved.