TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Fuel Cell: The fuel electrode is further equipped with an adhesive layer through which the catalyst and proton-conductive material are coated with the limit pervious layer. The fuel electrode is further equipped with a support (21) for the catalyst. The thickness of the limit pervious layer is 10-500 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Agent: The adhesive layer is formed using a silane-coupling agent. The silane coupling agent is gamma-aminopropyl triethoxysilane.    TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The limit pervious layer coats the catalyst and the proton-conductive material. The principal chain is not bonded with fluorine. The fluoro alkyl group is bonded with the principal chain via a carboxylate-ester group. The carbon bonded with the carboxylate-ester group of the fluoro alkyl group is a primary carbon atom. The fluorine-containing rate (z) is given by, z=x/(x+y)=0.3-1, where x is the atom number of fluorine contained in the fluoro alkyl group and y is the atom number of hydrogen contained in the fluoro alkyl group. The carbon atom number of fluoro alkyl group is 3-15. The polymer has a molecular weight of 1000-50000. Preferred Polymers: The polymer is 1H, 1H-perfluorooctyl polymethacrylate or 1H, 1H, 2H, 2H-perfluorodecyl polyacrylate. The limit pervious layer is formed using a mixture of the polymer and another polymer in which the alkyl alcohol ester group with hydrogen of carboxyl group substituted by alkyl group is bonded with the principal chain formed of carbon. The carbon atom number of alkyl alcohol ester group is 2-10. The other polymer is cyclohexyl polymethacrylate. The alkyl group is cyclohexyl. The adhesive layer contains polyvinyl alcohol, cellulose, epoxy resin, urethane resin, acrylic resin, polyimide resin, agar, and/or albumin. The polymer is synthesized from monomer(s) chosen from unsaturated hydrocarbon, unsaturated carboxylic acid, and unsaturated alcohol, preferably polycarboxylic acid. The polymer is a copolymer of methacrylic acid and acrylic acid, polycarboxylic acid, and poly(meth)acrylic acid. The polymer is obtained by esterifying polycarboxylic acid and fluoro alcohol.