NOVELTY - A mesoporous carbon composite comprises mesoporous carbon having mesopores; a conductive polymer coated on only an outer surface of the mesoporous carbon; and an organic electrolyte doping the conductive polymer-coated mesoporous carbon and comprising a lithium salt and an organic solvent.    USE - In fuel cells such as phosphoric acid fuel cell, proton exchange membrane fuel cell and direct methanol fuel cell (claimed).    ADVANTAGE - The mesoporous carbon composite is coated is coated only on the outer surface with a conductive polymer to reduce a contact resistance between carbon particles, thus electrode resistance is reduced, and can efficiently transfer electric energy. Such a mesoporous carbon composite can be used as a conductive material for electrodes for fuel cells, and a supported catalyst containing the support can be used to manufacture a fuel cell having improved efficiency. Pores of the mesoporous carbon composite are regularly arranged. Due to the doping of the organic electrolyte, the sheet resistance of the mesoporous carbon is improved (i.e. the sheet resistance is reduced). The sheet resistance of the mesoporous carbon is much lower than that of conventional mesoporous carbon. Since the average diameter of the mesopores is less than 2 nm, the catalyst efficiency is increased.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) preparing the mesoporous carbon composite involving: impregnating an ordered mesoporous silica (OMS) with a carbon precursor mixture comprising a carbon precursor, an acid and a solvent; heat-treating and carbonizing the impregnated OMS to form an OMS-carbon composite; mixing the OMS-carbon composite with a monomer that forms the conductive polymer and a solvent to provide a surface of the OMS-carbon composite with the monomer; polymerizing the monomer to obtain a conductive polymer-coated OMS-carbon composite; removing the OMS from the conductive polymer-coated OMS-carbon composite to obtain the conductive polymer-coated mesoporous carbon; and doping the conductive polymer-coated mesoporous carbon with the organic electrolyte;    (2) a supported catalyst comprising the mesoporous carbon composite or carbon and metal catalyst particles that are supported on the mesoporous carbon composite; and    (3) a fuel cell comprising a cathode; an anode; and an electrolyte membrane interposed between the cathode and the anode, where at least one of the cathode and the anode contains the supported catalyst.