Abstract: A method for preparing a catalytic material of an electrode for electrochemical reduction reactions, which comprises: a) a step of electrolysis of at least one aqueous and/or organic solution comprising at least one precursor of the active phase comprising at least one group VIB metal in order to obtain a solution comprising at least one precursor comprising at least one group VIB metal which has been partially reduced; b) a step of impregnation of said support with said solution obtained in step a) in order to obtain a catalytic material precursor; c) a step of drying said precursor obtained in step b) at a temperature below 250° C., without subsequent calcination; d) a step of sulfurization of the catalytic material precursor obtained in step c) at a temperature of between 100° C. and 600° C.

Abstract: The invention relates, on the one hand, to a composite material composition capable of neutralizing acid compounds and of being used under high temperature conditions, said composition being a mixture of a polymer material with a predetermined amount of reactive fillers, the mass fraction of the chemically active products ranges between 4 and 40% and the polymer material is selected from the vinylidene fluoride copolymers family, comprising a vinylidene fluoride monomer, and at least one monomer being selected from among the following monomers: hexafluoropropylene, perfluoro(methylvinyl)ether, perfluoro(ethylvinyl)ether, perfluoro (propylvinyl)ether, tetrafluoroethylene, perfluorobutylethylene, fluoropropylene, chlorotrifluoroethylene, chlorodifluoroethylene, chlorofluoroethylene, trifluoroethylene, and the monomer with the following formulation: CH2?CH—CF2—(CF2)4—CF3 and, on the other hand, to a pipe comprising at least one sheath made from the composite material composition.