Abstract
One of the most valuable features of carbon paste electrodes is the wide potential range available for both anodic and cathodic reactions. In the present study both the oxidation of the amino group and the reduction of the nitro function on p-nitroaniline are examined. The ratio of the limiting currents, i c/i a , is close to 3. The nitro reduction was shown to be a 6-electron process using the technique of cyclic voltammetry. Thus, it is established that the amine oxidation is an overall ( n T ) 2-electron process. This novel determination of n t using such a bi-functional molecule does not require the diffusion coefficient to be known and may be applicable to other solid electrode mechanism studies.
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