TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The fuel is methanol aqueous solution. The fuel may also be hydrogen supplied from a hydrogen storage supply system that performs hydrogenation reaction by a hydrogen storage of an aromatic compound and dehydrogenation reaction of a hydrogen storage material of hydrogenated derivatives of the aromatic compound.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The super water-repellency is imparted by silicon compounds having perfluoropolyether chains, silicon compound having perfluoroalkyl chains and/or silicon compounds having fluoroalkyl chains.Preferred Condition: The silicon compounds are present in the vicinity of the surface of the catalyst layer or is contained in the cathode catalyst layer. SPECIFIC COMPOUNDS - The silicon compound is a compound of formula F(CF(CF3)-CF20)n-CF(CF3)-CONH-(CH2)3-Si(OCH2CH3)3; F(CF(CF3)-CF20)n-CF(CF3)-CONH-(CH2)3-Si(OCH3)3; F(CF2CF2CF20)n-CF2CF2-CONH-(CH2)3-Si(OCH2CH3)3; F(CF2CF2CF20)n-CF2CF2-CONH-(CH2)3-Si(OCH3)3; H(CF2)6-CONH-(CH2)3-Si(OCH2CH3)3; H(CF2)6-CONH-(CH2)3-Si(OCH3)3; H(CF2)8-CONH-(CH2)3-Si(OCH2CH3)3; H(CF2)8-CONH-(CH2)3-Si(OCH3)3; F(CF2)6-CH2CH2-Si(OCH3)3; F(CF2)8-CH2CH2-Si(OCH3)3; F(CF2)6-CH2CH2-Si(OCH2CH3)3; or F(CF2)8-CH2CH2-Si(OCH2CH3)3.    EXAMPLE - A silicon compound of formula F(CF(CF3)-CF2O)n-CF(CF3)-CONH-(CH2)3-Si(OCH2CH3)3 was synthesized using Krytox 157FS-L (average molecular weight 2,500, 25 parts by weight (pbw)) dissolved in PF-5080 (100 pbw). Thionyl chloride (20 pbw) was added to the solution under stirring for 48 hours. Thionyl chloride and PF-5080 were evaporated with an evaporator to produce 25 pbw of an acid chloride of Krystox 157FS-L. To the resulting product were added PF-5080 (100 pbw), Sila Ace S330 (3 pbw), and thriethyl amine (3 pbw). The reaction solution was filtered with Radiolite Fine Flow-A to obtain a filtered solution. PF-080 in the solution was evaporated to obtain F(CF(CF3)-CF2O)n-CF(CF3)-CONH-(CH2)3-Si(OCH2CH3)3 (20 pbw).