The regularities of the influence of the modification of the surface layer of tissue carbon and graphite fibrous materia on the composition, the amount of superficial functional oxygen-containing groups by different methods have been studied. The relationship between the electrocatalytic and corrosion characteristics of cathodes from tissue carbon and graphite fibrous materia has been established during electrosynthesis of H₂O₂. They were tested during electrosynthesis of H₂O₂ in a diaphragm cell with a current load of up to 100 A. A topological model of synchronous electrosynthesis hydrogen peroxide and ozone was developed