TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Organic Group: The organic group is benzene sulfonate anion, and is a proton conducting group and/or electron conducting group.Preferred Composition: The counter ionic catalyst group in the modified carbon product, comprises a metal catalyst such as platinum, cationic catalyst group and platinum tetra amine.Preferred Layer: The electrode and the counter-electrode each has a blocking layer and an active layer, and each layers comprises at least one modified carbon product. The active layer having a thickness of less than 10 microns, does not contain fluoropolymer binder. The electrolyte membrane comprises polytetrfluoroethylene. The membrane further has a layer (III) comprising at least one hydrophobic polymer.Preferred Method: The method for increasing catalyst accessibility in an electrode further involves depositing a catalytic material on the carbon product. Formation of carbon substrate further involves removing contaminants such as ammonium ions and/or chlorides ions from the modified carbon product. The reducing agent is hydrogen gas, and the catalyst obtained is platinum having a particle size of 1 nm or less. SPECIFIC COMPOUNDS - The modified carbon product is carbon black.    EXAMPLE - Polyethylene tetra fluoroethylene bonded catalyst layer was treated in aqueous solution containing (9 vol% of isopropanol) to attach -C6H4SO3Na groups to the carbon support. The isopropanol was added to aid the wetting of the catalyst layer. The catalyst layer/Toray paper combination, was placed, in a tray containing water (1500 cc), isopropanol (150 cc), and sulfanilic acid (10 g). The solution was circulated. Sodium nitrite (4.2 g) dissolved in water (100 ml), was added to the circulated solution. The circulation of the solution was continued for 2 hours and cooled. The resulting structure was washed with isopropanol, methanol and water, and dried at 75 degrees C for 2 h, to obtain membrane electrode assemblies having a weight of 0.6524 g and contained 0.2 mumol/cm2 of -C6H4SO3Na groups, and a fuel cell containing membrane electrode assemblies was obtained.The obtained electrode assemblies had voltage intercept of 0.999 at 1 mA/cm2, Tafel slope of 0.048 mV/dec, resistance of 38.9 V/100 A/cm2 and impedance spectroscopy of 20 V/100 A/cm2.