Poly-o-aminophenol obtained at high potentials by cyclic voltammetry on SnO2: F electrodes. application in quantitative determination of ascorbic acid

Abstract

In the present work the obtention of poly-o-aminophenol (POAP) at high potentials on conducting glass (SnO2: F) is reported. The synthesis was carried out by continuous potential cycling in a 1×10-3 M o-aminophenol (OAP), 0.1 M hydrochloric acid, and 0.1 M potassium chloride solution between -0.2 and 1.5 V at 0.05 V·s-1 vs AgAgCl. The polymer growth was followed by cyclic voltammetry, UV-vis spectra, and AFM characterization. The SnO2: F modified electrode (SnO2: F/POAP) was tested in the electro-oxidation of ascorbic acid (AA) in phosphate buffer solution. This coating showed an important electrocatalytic effect because a negative anodic shift of 0.4 V with respect to a bare SnO2: F glass electrode was observed.