The method relates to triggering a self-propagating reduction-exfoliation process of graphene oxide in a porous material containing graphene oxide to increase the total electric conductivity and the specific surface area of the porous material. It's subject matter consists in that the initial electric plasma is generated in the adjacent part and only partly in the inside part (4) of the total volume (2) of the reduced-exfoliated porous material. This triggers the self-propagating reduction-exfoliation process, wherein to generate the initial electric plasma the parameters of the following group are fulfilled: the temperature of the working gas is less than 400° C., the pressure of the working gas is higher than 10 kPa, the speed of the working gas is less than 0,1 mxs−1, the temperature of the total volume of the porous material is less than 200° C.