Simple Reactions on Stationary Planar Electrodes

The dimensionless net peak current A primarily depends on the product nEs [31]. This is shown in Table II.3.1. With increasing wE the slope 9A Pp/9nEs continuously decreases, while the half-peak width increases. The maximum ratio between A p and the half-peak width appears for wE = 50 mV [6]. This is the optimum amplitude for analytical measurements. If E = 0, the square-wave signal turns into the signal of differential staircase voltammetry, and A p does not vanish [6,32,33]. 

The peak currents and potentials of the forward and backward components are listed in Table II.3.2. If the square-wave amplitude is not too small (wEg 10 mV), the backward component indicates the reversibility of the electrode re- 

The net peak current depends linearly on the square root of the frequency  

The net current of a totally irreversible electrode reaction (Eq. II.3.1) is smaller than its forward component because the backward component is positive for all potentials (see Fig. II.3.4), regardless of the amplitude [43-45]. The ratio Aip// and the half-peak width are both independent of the frequency, but the net peak potential is a linear function of the logarithm of frequency, with the slope 9Ep/a log/= 2.3 RTIlan [6,38]. 

Simple Reactions on Stationary Spherical Electrodes and Microelectrodes 

---