We report the synthesis of graphene oxide by the electrochemical method. The standard redox potentials of the carboxyl groups of carbon is used to select the oxidation potential. Graphene oxide obtained by anodic oxidation of multiwall carbon nanotubes in concentrated sulfuric acid, confirmed by electron microscopy, XRD, X-ray photoelectron spectroscopy, X-ray emission spectroscopy and Raman spectra, is a prospective electrode material for the chemical current sources. The oxidation potential in 96 % sulfuric acid is +3 V and the time of oxidation was 4 h. A good electrical conductivity is observed because of the presence of fragments of carbon nanotube in graphene oxide. Thus, this material is a very promising electrode material for oxygen electrodes. The current–voltage characteristics of the oxygen electrodes, based on electrochemically produced graphene oxide, is the graphene oxide produced by anodic oxidation of multiwall carbon nanotubes.