TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The transition metal is cobalt, iron, nickel, chromium, copper, manganese, tantalum or tungsten.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The monomer includes nitrogen coordination site for incorporating a transition metal.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: In the method, a nitrogen-containing compound is added to the porous polymer. The method further includes: adding nitrogen-containing organic compounds during the step of adding the precursor to the porous polymer; and post-treatment. The step of preparing the porous polymer includes: a cross-linking reaction; cross-linking at least one organic monomer with a functional group comprising ethynyl, thiophenyl, amino, ketone, aldehyde or carboxylic anhydride; and cross-linking organic monomers with a stereo-hindered group. The cross-linking reaction includes: adding a catalytic agent comprising ferric chloride; and adding a voltage bias to the monomer solution while preparing the porous polymer. The step of activating the transition metals includes calcining the porous polymer to form a carbonaceous material in an inert gas atmosphere. The carbonaceous material is treated at an elevated temperature in the presence of nitrogen-containing compounds comprising ammonia, pyridine or acetonitrile. The step of activating transition metal sites includes adding a metal complex comprising bis(hexafluoroacetylacetonate) cobalt, bis(hexafluoroacetylacetonate) ferrate or bis(hexafluoroacetylacetonate) nickel. The cross-linking reaction comprises oxidative coupling of the monomer comprising porphyrin with thiophenyl functional groups catalyzed by ferric chloride or by constant voltage bias applied to the at least one monomer. The cross-linking reaction involving trimerization of the monomer containing ethynyl functional groups and a second monomer containing a stereo-contorted structure catalyzed by a transition metal catalyst. The cross-linking reaction involving trimerization of at least one of a first monomer containing cyano groups and a second monomer containing a stereo-contorted structure catalyzed by trifluoromethylsulfonic acid or lewis acid. The cross-linking reaction includes a catalytic homocoupling of a first monomer containing arylbromide or ethynyl groups and a second monomer containing a stereo-contorted structure. The cross-linking reaction involves a condensation coupling of a first monomer containing ketone, aldehyde, or anhydride and a second monomer containing arylamine. The cross-linking reaction involves a first monomer containing chloromethyl group and a second monomer containing a stereo-contorted structure through Friedel Crafts reaction.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The electrocatalyst consists essentially of the porous polymer and at least one transition metal. The porous polymer consists essentially of a product formed by a cross-linking reaction with at least one monomer or with at least one of a first monomer and a second monomer. The at least one monomer is a monomer containing nitrogen-coordinating sites for incorporating the transition metal or a stereo-contorted structure for producing porosity and increased surface area. The stereo-contorted structure is a structural element group of spirobifluorene, tetraphenylmethane or triphenylamine substituted with different functional groups. EXAMPLE - No suitable example given.