TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The functional monomer is methacrylic acid, vinyl dimethyl phosphate and styrene. The crosslinking agent is ethylene glycol dimethacrylate or divinylbenzene. The mass ratio of hydroxylated carbon nanotube and ethanol is 1:500-1:20. The mass ratio of 3-(trimethoxysilyl)propyl-2-methyl-2-propenoate and carbon nanotube is 1:4-2:1. The mass ratio of vinyl-modified carbon nanotube and acetonitrile is 1:4000-1:500. The volume ratio of functional monomer and crosslinker is 1:3-2:1. The volume ratio of crosslinking agent and acetonitrile is 1:800-1:50. The quantity of azobisisobutyronitrile is 1-2 wt.% of functional monomer and crosslinking agent. The volume ratio of distilled-off solvent and acetonitrile is 1:8-5:8.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The polymer-functionalized carbon nanotube is ultrasonically dispersed in N,N-dimethylacetamide in nitrogen atmosphere, then Nafion (RTM: perfluorosulfonate ionomer) polymer is added, stirred, cast into film having Nafion (RTM: perfluorosulfonate ionomer) polymer content of 0.2-10 wt.%, dried, processed using hydrogen peroxide and sulfuric acid, water-washed and vacuum-dried, to obtain hybrid film. The polymer-functionalized carbon nanotube is polymer covalently grafted with carbon nanotube obtained by polymerizing vinyl-modified carbon nanotube, functional monomer, crosslinking agent and azobisisobutyronitrile as raw material, centrifuging, washing and drying. A certain amount of hydroxylated carbon nanotube is ultrasonically dispersed in anhydrous ethanol to obtain solution (A). Certain amount of 3-(trimethoxysilyl)propyl-2-methyl-2-propenoate is added to the solution (A) and stirred at 60 degrees C for 24 hours, centrifuged, dried and washed, to obtain vinyl-modified carbon nanotube. Certain amount of vinyl-modified carbon nanotube is dispersed in acetonitrile, functional monomer, crosslinking agent and azobisisobutyronitrile are added, heated, reacted, certain amount of the solvent is distilled off, centrifuged, washed, vacuum-dried, 10 M hydrochloric acid is added, and refluxed for 12 hours, to obtain polymer-functionalized carbon nanotube having polymer layer thickness of 10-35 mm. Certain amount of polymer-functionalized carbon nanotube are ultrasonically dispersed in N,N-dimethylacetamide in nitrogen atmosphere, Nafion (RTM: perfluorosulfonate ionomer) polymer is added, and stirred at room temperature for 12 hours, to obtain casting solution. The casting solution is filtered, degassed for 1 hour, placed in oven, heat-treated, obtained film is peeled, immersed in 3 wt.% hydrogen peroxide, water, 1 M sulfuric acid and water in order, washed using water, and then the film is vacuum-dried to obtain hybrid film. Preferred Composition: The mass ratio of polymer-functionalized carbon nanotube and N,N-dimethylacetamide is 1:20000-1:100. The mass ratio of Nafion (RTM: perfluorosulfonate ionomer) polymer and N,N-dimethylacetamide is 1:40-1:10.