Electrocatalytic reduction of oxygen and hydrogen peroxide at poly(p-aminobenzene sulfonic acid)-modified glassy carbon electrodes

The electrocatalytic ability of the modified electrodes for the reduction of dioxygen to hydrogen peroxide was investigated by using cyclic voltammetry and chronocoulometry techniques at poly(p-aminobenzene sulfonic acid) (PABS)-modified glassy carbon electrodes. The electrochemical reduction of oxygen (O2) has been studied in pH 7.0 buffer solution by using PABS-modified glassy carbon rotating ring disk electrode (RRDE). The PABS-modified glassy carbon (GC) electrode (GC/PABS) showed excellent electrocatalytic activity for oxygen and hydrogen peroxide (H2O2) reduction reactions. The RRDE data indicated that the reduction of oxygen on GC/PABS electrodes proceeds by a two-electron pathway in aqueous buffer solution (pH 7.0). In addition, PABS-coated GC electrode was successfully utilized as an enzyme-less amperometric sensor for the detection of hydrogen peroxide (H2O2) in the range from 50 to 550 μM with detection limit of (S/N = 3) 10 μM.

Graphical abstractThe electrocatalytic ability of the modified electrodes for the reduction of dioxygen to hydrogen peroxide was investigated by using cyclic voltammetry and chronocoulometry techniques at poly(p-aminobenzene sulfonic acid) (PABS)-modified glassy carbon electrodes. For the first time, the electrochemical reduction of oxygen (O2) has been studied on PABS-modified glassy carbon electrode in pH 7.0 buffer solution using the rotating ring disk electrode (RRDE). In addition, we tested amperometric determination of hydrogen peroxide by using PABS modified GC electrode. In addition, we tested amperometric determination of hydrogen peroxide by using PABS modified GC electrode. Figure optionsDownload full-size imageDownload as PowerPoint slide