Carbon black 1 Cell-be 1 Cell/B.E 1 Cell/BE 1 Doping (additives) 1 Electrocatalyst support 1 Electrocatalysts 1 Electrolytic reduction 1 Ionomers 1 Modified carbon 1 Morphology 1 Nitrogen 1 Nitrogen functionalities 1 Nitrogen plasma 1 Oxygen 1 P.E.M.F.C 1 Proton exchange membrane fuel cells (PEMFC) 1 Proton-exchange membranes fuel cells 1 Textures 1 Vulcan XC72 ]+ catalyst 1