TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Arrangement: The fuel cell system further comprises a heat feed mechanism which supplies heat produced by hydrolysis of hydrogen generating material hydrogen generating mechanism, or oxidation reaction to fuel cell, and air supply fan (70), non-return valve between air chamber and hydrogen generating mechanism, and gas liquid separation film in combustion chamber. The hydrogen generating material has small opening which is provided for he lower stream rather than the upper stream where air containing steam is introduced. The hydrogen generating material has several number of stoichiometry of hydrogen to generate which is greater than number of stoichiometry of steam, for hydrogen generating material which generates hydrogen for pressure regulation. The fuel cell system has several fuel cells, and has a partition which separates hydrogen generated by hydrogen generating mechanism and fuel in combustion chamber. The fuel cell system is provided in electronic devices. Preferred Components: The introductory mechanism contains a valve (60) which adjusts a water vapor content introduced into hydrogen generating mechanism. The hydrogen generating mechanism has internal pressure (Pl) which is greater than internal pressure (P2) of combustion chamber. The fuel cell system has a leak valve which adjusts pressure (P1,P2) of hydrogen generating mechanism and/or combustion chamber.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred compounds: The hydrogen generating material comprises hydride of formula: MH4-n, M(BH4)4-n or M(AlH4)4-n, where M is alkaline metal of group (1A) or alkaline-earth metal of group (2A) in periodic table, and n is 0-3. The metal particles are chosen from aluminum, iron and magnesium. The hydrogen generating material is chosen from lithium hydride, sodium hydride, potassium hydride, magnesium hydride, calcium hydride, aluminum hydride, lithium borohydride, sodium borohydride, lithium aluminum hydride, ammonium borane and sodium aluminum hydride. The hydrogen separation mechanism comprises an inorganic porous membrane containing porous ceramics and an alloy film comprising a metallic substrate which consists of niobium, tantalum, vanadium, porous glass, porous ceramics, or porous aluminum oxide coated with palladium or palladium alloy.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The combustion chamber comprises fuel chosen from methanol, ethanol or dimethoxymethane, or mixture of formic acid, methyl formate, dimethyl ether, butane, ascorbic acid, hydrazine, ammonia, sulfurous acid, hydrogen sulfite, thiosulfate salt, dithionite, hypophosphorous acid and phosphorous acid. The fuel is preferably gaseous fuel chosen from hydrogen, dimethyl ether, butane and ammonia, and dissolves liquid fuel or solid fuel. The gas-liquid separation film is a porous layer.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compounds: The hydrogen separation mechanism comprises a polymer film containing polyimide or polysulfone.