Differential pulse voltammetry potential wave-form

Potentiodynamictechniques— are all those techniques in which a time-dependent -> potential is applied to an - electrode and the current response is measured. They form the largest and most important group of techniques used for fundamental electrochemical studies (see -> electrochemistry), -> corrosion studies, and in -> electroanalysis, -+ battery research, etc. See also the following special potentiodynamic techniques - AC voltammetry, - DC voltammetry, -> cyclic voltammetry, - linear scan voltammetry, -> polarography, -> pulse voltammetry, - reverse pulse voltammetry, -> differential pulse voltammetry, -> potentiodynamic electrochemical impedance spectroscopy, Jaradaic rectification voltammetry, - square-wave voltammetry. 

The potential wave-form for differential pulse voltammetry (DPV) is shown in Figure 2.8. The perturbation consists of a series of pulses having constant amplitude, superimposed at the same time upon a staircase wave-form. In contrast with NPV, the current is sampled twice at each pulse period (at the beginning and at the end of the pulse). The difference between these two current values is recorded and displayed as function of the applied potential, E, as shown in Figure 2.9, where it is observed that the current function response is characterized by symmetric peaks [4,8]. 

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