TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The carbon nanotubes are single-wall carbon nanotubes and/or multi-wall carbon nanotubes. The carbon nanotubes are derivatized with a functional group, preferably a carboxylic acid group. The ink is in contact with a proton exchange membrane. Preferred Property: The electrode provides greater than 1 (preferably greater than 100) mA/cm2/micrograms Pt/cm2 of the planar area of the mat of carbon nanotubes. Preferred Method: Associating is done by chemical vapor deposition, electrochemical deposition, physical vapor deposition, thermal deposition, cathodic arc deposition, ion sputtering, evaporative sputtering, molecular beam epitaxy, ion beam assisted deposition and/or jet vapor deposition; most preferably by chemical vapor deposition of a catalyst metal precursor. The catalytic precursor is converted to a catalytically active material by hydrogen reduction and/or chemical reduction. The forming is done on a proton exchange membrane or gas diffusion layer by painting, spraying, subliming, electrolytic deposition, centrifugation and/or filtering a suspension using the element.    TECHNOLOGY FOCUS - METALLURGY - Preferred Material: The catalyst metal comprises platinum and/or ruthenium. The catalyst metal precursor is chloroplatinic acid. The catalytically active material is in the form of particles on the carbon nanotubes. Preferred Concentration: The catalyst metal is present in an amount less than 400 (preferably less than 10) micrograms/cm2 of the planar area of the mat of the carbon nanotubes.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: An ionomeric resin is mixed with the carbon nanotubes in the association process. The ionomeric resin is a perfluorosulfonic acid/tetrafluoroethylene copolymer. The carbon nanotubes are coated with perfluorosulfonic acid/tetrafluoroethylene copolymer. The catalyst ink further comprises an ionomeric resin, preferably a perfluorosulfonic acid/tetrafluoroethylene copolymer.