Reduction of the salicylic acid on the nanostructured electrodes modified by chrome

The electrochemical reduction of salicylic acid on the surface of smooth and nanostructured electrodes with electrodeposited chromium it was studied using cyclic voltammetry. It has been found that the reduction process on both electrodes is irreversible and occurs at the similar electrode potentials, but on the nanostructured electrode it is almost twice as intense. It found that the nature of the first peak, corresponding to the potential range -0.45– -0.5 V, associated with the discharge of hydroxonium ion. The reduction process of studied depolarizer proceeds at potentials close to - 1.0 V, which corresponds to the second current maximum on the current-voltage curve. It has been studied that the reduction currents increase proportionally to the concentration of salicylic acid for both the smooth and nanostructured electrode cases, which can be used for the voltammetric determination of salicylic acid in aqueous solutions. The diffusion coefficients and the rate constant on the surface of smooth and nanostructured electrodes calculated from the voltammetric data are well correlated, suggesting a similar mechanism of electroreduction.