TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Cell: The heating unit of the fuel cell heats the hydrogen storage material at 300degreesC or less.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: Water along with the hydrogen ion is held by the interlayer of the layered transition metal compound. Preferred Method: pH of water reacting with the transition metal compound is adjusted during reaction. Preferred Compound: The layered transition metal compound is fine particle or porous material, and contains cation (12) in interlayer. The layered transition metal compound is AyTX2, ByTX2, La2-yByTO4, AyTXCl, ByTXCl, AyTXBr, ByTXBr, TyMX2, MXCl, MXBr, YB2T3Oy, Bi2Sr2CaCu2Oy, Tl2Sr2CaCu2Oy, or Hg2Sr2CaCu2Oy.A=sodium, potassium, lithium or rubidium;B=calcium, strontium or barium;T=titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, rhodium or ruthenium;M=zirconium, niobium, molybdenum, technetium, hafnium, tantalum or tungsten;X=oxygen, sulfur or selenium;andy=1-2.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: Water along with the hydrogen ion is held by the interlayer of the layered transition metal compound. Preferred Method: pH of water reacting with the transition metal compound is adjusted during reaction. Preferred Compound: The layered transition metal compound is fine particle or porous material, and contains cation (12) in interlayer. The layered transition metal compound is AyTX2, ByTX2, La2-yByTO4, AyTXCl, ByTXCl, AyTXBr, ByTXBr, TyMX2, MXCl, MXBr, YB2T3Oy, Bi2Sr2CaCu2Oy, Tl2Sr2CaCu2Oy, or Hg2Sr2CaCu2Oy.A=sodium, potassium, lithium or rubidium;B=calcium, strontium or barium;T=titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, rhodium or ruthenium;M=zirconium, niobium, molybdenum, technetium, hafnium, tantalum or tungsten;X=oxygen, sulfur or selenium;andy=1-2. EXAMPLE - Sodium carbonate and cobalt oxide (CoO4) were mixed such that the molar ratio of sodium and cobalt was 0.8:1, and molded to tablet form. The tablet (4 g) was heated at 850degreesC for 15 hours, sintered and mashed to powder of 1 microns. The powder was mixed in solution of liquid odor material (25 g) dissolved in acetonitrile (50 ml) for 3 days and reduced with bromine, to obtain layered transition metal compound (NaxCo2). The obtained powder was washed by acetonitrile and with water. The aqueous solution was filtered to obtain paste-form hydrogen storage material containing water. The hydrogen storage material had favorable hydrogen generation capability.