▎ 摘　　要

The electrochemical behavior of electroactive composites based on reduced graphene oxide (RGO), poly-o-phenylenediamine (PPD) and heteropolyacids (HPA) (silicotungstic [SiW] and phosphotungstic [PW]) was comparatively studied by means of cyclic voltammetry (CVA), charge-discharge galvanostatic curves, and electrochemical impedance. The composites were applied to planar screen-printed carbon electrodes as the first step to creating various devices, in particular, sensors based on novel composites. Like RGO-PPD-SiW composites, RGO-PPD-PW composites also exhibit several redox transitions. With respect to the method of synthesis (order of applying components), RGO-PPD-PW can exhibit the properties of a mediator catalyst as was demonstrated for example of the redox transition in the quinone-hydroquinone couple, where reversibility is significantly enhanced by conducting the reaction on a RGO-PPD-PW-modified electrode.