The invention relates to a method for producing composite materials by the electrochemical recovery of polymer or copolymer of a following carbon-based support on which use is made of a reaction system comprising (a) at least one monomer which forming a polymer on the above substrate, (b) an aprotic solvent and (c) an electrolyte giving the organic medium thus obtained a sufficient electrical conductivity in order to conduct electrolysis, wherein the carbon support form permanently the cathode, by applying a potential of electric current or causing the reaction system in the passivation region corresponding to a first peak detected in voltapérométrie inhibition, so as to form a polymer grafted onto said support.
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