Basic Rules and Techniques

This is illustrated in Fig. 4.7. In the simplest case the solid-liquid interface can be described by a charge transfer resistance R and a capacity in parallel (Helmholtz capacity for metal electrodes, Ch, and a space charge capacity for semiconductor elec- 

Since the current across a capacitor is given by = C dU(t)/dt one obtains by applying Eq. (4.12) 

Since most current-potential curves show usually an exponential type of dependence the small modulation of the Faradaic current, AJp. flowing only through R, can be obtained by 

Since the d.c. current, 7, is equal to the 7p, one obtains from Eq. (4.16) after having inserted Eq. (4.13) 

When a sinusoidal voltage is applied across the interface U(t) = sin( t) = exp(i t) 

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