Electrochemical synthesis and characterization of new electrodes based on poly‐hematoxylin films

The poly‐hematoxylin films undoped (p‐HX) and doped with strontium (p‐HX‐Sr) were prepared on the platinum electrodes (Pt) using cyclic voltammetry. The influence of experimental parameters, such as: anodic potential and number of voltammetric cycles on the films synthesis was investigated by electrochemical impedance spectroscopy (EIS). The results showed that, the optimal conditions to obtain the poly‐hematoxylin films on platinum electrode from 10−2 mol L−1 NaNO3 solution, were found by recording 10 voltammetric cycles at an anodic potential of 1.5 V. Electrocatalytic activity of the poly‐hematoxylin‐platinum (p‐HX/Pt) and poly‐hematoxylin‐strontium‐platinum (p‐HX‐Sr/Pt) electrodes was tested for electrochemical degradation of benzocaine using UV‐Vis spectrophotometry. Both, the mechanisms of hematoxylin (HX) polymerization, as well as benzocaine degradation were proposed.