NOVELTY - A fuel cell cathode (10) comprises: a cathode body (20); a binder layer (40) attached to contact portion of outer surface (25) of cathode body, where binder layer comprises a composite of conductive polymer and nonaligned carbon nanotubes; and a catalytic layer (50) supported by the binder layer, where catalytic layer comprises several vertically-aligned nitrogen-doped carbon nanotubes (55).    USE - As fuel cell cathode, where fuel cell is hydrogen gas, glucose, methanol, or formaldehyde fuel cell (claimed).    ADVANTAGE - The fuel cell cathode provides metal-free fuel cell cathode having catalytic layer of metal-free vertically-aligned, nitrogen-doped carbon nanotubes (VA-NCNTs) forming efficient oxygen-reduction reaction (ORR) cathode catalyst layers. These metal-free catalytic layers provide superior oxygen-reduction reaction performance including increased electrocatalytic activity, increased long-term operational stability, increased tolerance to crossover effects than oxygen-reduction cathodes comprising metals such as platinum, and resistance to CO poisoning. The VA-NCNTs catalyze a four-electron ORR process in alkaline electrolytes with much higher electrocatalytic activity, lower overpotential, smaller crossover effect, and increased long-term operational stability; when compared with commercially available or similar platinum electrodes. The incorporation of electron-accepting nitrogen atoms in conjugated nanotube carbon plane facilitates ORR on NCNT electrodes during electrochemical cycling, as absorbed O2 molecules reduce charge-deficient carbon atoms around electron-rich nitrogen atoms and then reoxidize reduced carbon atoms to their preferred oxidized states. The high surface area, good electrical and mechanical properties, and superb thermal stability intrinsically characteristic of carbon nanotubes can provide additional advantages for nanotube electrode to be used in fuel cells under both ambient and harsh conditions (e.g. at elevated temperatures where other metal-free electrodes, such as polymers, fail due to thermal degradation). The superior electrocatalytic performance of VA-NCNT/GC electrode is attributable to more well-defined, larger surface area of VA-NCNT electrode. In the VA-NCNT electrode, all of nanotube top-ends define single plane at interface of aligned nanotube electrode and electrolyte solution. This, in turn, may further facilitate electrolyte/reactant diffusion. Further, presence of nonaligned carbon nanotubes within a conductive polymer nanotube composite stabilizes catalytic layer and strengthens bonding between binder layer and catalytic layer, such as through van der Waals interactions. The VA-NCNTs can be formed by pyrolysis of a metalorganic compound and integration of the nanotubes with nitrogen. The binder layer is then applied, and resulting supported nanotube array may be attached to cathode body. The carbon nanotubes produced by pyrolysis of iron (II) phthalocyanine (FePc, a metal heterocycle molecule containing nitrogen) can be used as effective ORR electrocatalysts even after complete removal of residual Fe catalyst. As the number of industrial-scale facilities for relatively low-cost production of carbon nanotubes continues to grow, price of carbon nanotubes is expected to further decrease significantly. Thus bottleneck in technological development of low-cost and high-performance fuel cells can be resolved by replacing expensive noble metal electrocatalysts with metal-free carbon nanotube catalytic layers.    DETAILED DESCRIPTION - A fuel cell cathode (10) comprises: a cathode body (20); a binder layer (40) attached to contact portion of outer surface (25) of cathode body, where binder layer comprises a composite of conductive polymer and nonaligned carbon nanotubes; and a catalytic layer (50) supported by the binder layer, where catalytic layer comprises several vertically-aligned nitrogen-doped carbon nanotubes (55). The vertically-aligned nitrogen-doped carbon nanotubes have lengths of 5-15 mu m, and outer diameters of 20-30 nm. The contact portion of outer cathode surface comprises glassy carbon. The nonaligned carbon nanotubes are nitrogen-doped carbon nanotubes. The conductive polymer comprises polystyrene. INDEPENDENT CLAIMS are included for the following:    (1) fabricating fuel cell cathode involving: providing a substrate comprising an array of vertically-aligned nitrogen-doped carbon nanotubes bound to a surface of the substrate; coating top surface of the array with a binder layer comprising a composite of conductive polystyrene and nonaligned nitrogen-doped carbon nanotubes; etching free surface of the binder layer to expose within an etched free surface a portion of the nonaligned nitrogen-doped carbon nanotubes in the composite; removing the substrate to produce a free-standing film comprising the array of vertically-aligned nitrogen-doped carbon nanotubes supported by binder layer; and attaching etched free surface of free-standing film to a contact portion of outer surface of cathode body, where contact portion comprises glassy carbon; and    (2) fuel cell (200) comprising: fuel cell body (210); oxidant inlet (220) configured to fluidly couple fuel cell body to oxidant source; fuel inlet (230) configured to fluidly couple fuel cell body to fuel source; exhaust outlet (235); fuel cell cathode fluidly coupled to oxidant inlet; fuel cell anode (205) fluidly coupled to fuel inlet and exhaust outlet; at least one electrolyte configured to enable flow of ions between fuel cell cathode and fuel cell anode; electrically insulating ion-permeable membrane (250) disposed within fuel cell body between fuel cell cathode and fuel cell anode, where the membrane is configured to prevent flow of electrons between fuel cell anode and fuel cell cathode through electrolyte; and external circuit (260) isolated from electrolyte and electrically coupling fuel cell anode and fuel cell cathode, where fuel cell cathode comprises cathode body electrically coupled to external circuit; binder layer attached to contact portion of outer surface of cathode body, where binder layer comprises composite of conductive polymer and nonaligned carbon nanotubes; and catalytic layer electrically coupled to electrolyte and cathode body, where catalytic layer comprises several vertically-aligned nitrogen-doped carbon nanotubes supported by binder layer.    DESCRIPTION OF DRAWING(S) - The figure shows cross-sectional plan view of fuel cell comprising the fuel cell cathode having catalytic layer of vertically-aligned nitrogen-doped carbon nanotubes.    Fuel cell cathode (10)    Cathode body (20)    Outer surface of cathode body (25)    Binder layer (40)    Catalytic layer supported by binder layer (50)    Supported nanotube array (55)    Fuel cell (200)    Fuel cell anode (205)    Fuel cell body (210)    Oxidant inlet (220)    Fuel inlet (230)    Exhaust outlet (235)    Anode electrolyte (240)    Cathode electrolyte (245)    Ion-permeable membrane (250)    External circuit (260)