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 analogy between the responses obtained in derivative and differential voltammetric techniques and those corresponding to a new modality of the reciprocal derivative chronopotentiometric techniques using a programmed current of the form I(t) = I(0)t(u) with u greater than or equal to -1/2. Identical information can be obtained from derivative voltammetry and reciprocal derivative chronopotentiometry although the experimental application of the latter is simpler and signals obtained are less noise influenced due to the use of programmed current. In order to show the above mentioned analogy in the case 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 electrode. (C) 2000 The Electrochemical Society. S0013-4651(00)03-032-9. All rights reserved.