TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The process further comprises: preparing the polymer and the particle including the material before the step (a); and after step (a), a step of contacting the particles obtained at the end of step (a) with the carbon material, where the obtained particles are bonded with the carbonaceous material. The step of preparing particles comprising the material bound to the carbon material is carried out concomitantly with the step (a). Preferred Components: The particles are metal particles. The metal particles are particles comprising a noble metal such as platinum (preferred), ruthenium and/or palladium. The carbon material is graphite, carbon black, carbon fibers, carbon tubes and/or graphene.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic radical of the initiator compound is: derived from an organic halide compound having at least one sulfur containing group of formula (-S-S-) or (-SH), where -S-S- group is a divalent disulfide; a compound having a disulfide group -S-S- forming bridge between their two portions, where at least one of the two portions includes a phenyl having an amide group of formula (-NH-CO-R1); derived from a compound comprising 2-bromo-N-(4-(4-(2-bromo-2-methyl-propionylamino)-phenyldisulfanyl)-phenyl)-2-methyl-propionamide (I) or N-(4-(4-isobutyrylamino-phenyldisulfanyl)-phenyl)-isobutyramide moiety of formula (II), where the dotted line indicates a point of attachment of first and second polymer chains. The proton conductive group is a sulfonic acid group (-SO3H), a carboxylic acid group (-CO2H) or a phosphonic acid group (-PO3H2), where the groups are optionally present in salt forms.R1 = hydrocarbyl containing at least one halo atom.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer chains are from the family of polysulfones, polyether ketones, polyphenylene, polystyrenes or aliphatic fluorinated polymers, where these polymers contain proton conducting groups. The polymer has a structure of formula (V), where the polymer comprises a first polymer chain and a second polymer chain linked on either side of the radical (II). The polymer is obtained by polymerizing at least one alkene monomer of formula (CH2=CH-Z-E) (III) in the presence of an initiator compound comprising (I).Z = a phenylene group;E = a proton conductive group, optionally in salt form; andn, m = number of repeating units. EXAMPLE - No suitable example given.