NOVELTY - A combinatorial library is made by disposing on a substrate comprising silicon, graphite, boron, boron carbide, boron nitride, aluminum, germanium, silicon nitride, silicon carbide or silicon boride a reactant comprising a light metal; heat treating the substrate to create a diffusion multiple having at least2 phases; contacting the diffusion multiple with hydrogen; detecting any absorption of hydrogen; and/or detecting any desorption of hydrogen.    USE - For making a combinatorial library.    ADVANTAGE - The inventive method is safer and more effective.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of recovering hydrogen, comprising contacting compound comprising AlSi, Ca2Si, CaSi, CaSi2, KSi, K4Si23, Li22Si5, Li13Si4, Li7Si3, Li12Si7, Mg2Si, NaSi, NaSi2, Na4Si23, AlB2, AlB12, B6Ca, B6K, B12Li, B6Li, B4Li, B3Li, B2Li, BLi, B6Li7, Bli3, MgB2, MgB4, MgB7, NaB6, NaB15, NaB16, AlLi, Al2Li3, Al4Li9, Al3Mg2, Al12Mg17, AlBi2, Ge4K, GeK, GeK3, GeLi3, Ge5Li22, Mg2Ge, Ge4Na, GeNa, GeNa3, aluminum doped Ge4K, aluminum doped GeK, aluminum doped GeK3, aluminum doped GeLi3, aluminum doped Ge5Li22, aluminum doped Mg2Ge, aluminum doped Ge4Na, aluminum doped GeNa, aluminum doped GeNa3, Al4C3, Na4C3, Li4C3, K4C3, LiC, LiC6, Mg2C3, MgC2, AlTi2C, AlTi3C, AlZrC2, Al3Zr5C, Al3Zr2C4, Al3Zr2C7, KC4, and/or NaC4, with hydrogen to form a hydrogenated compound; and heating the hydrogenated compound to recover the hydrogen;    (2) a method of regenerating hydrogen, comprising contacting a compound with hydrogen to form a hydrogenated compound, and heating the hydrogenated compound to recover the hydrogen;    (3) an energy generation device, employing the hydrogen recovery and regeneration method to generate energy;    (4) a compound of a diffusion multiple;    (5) a composition comprising a hydride of the compound;    (6) a hydrogen storage composition comprising a catalyst composition disposed upon a storage composition, where the catalyst composition comprises calcium, barium, titanium, chromium, manganese, iron, cobalt, copper, silicon, germanium, rhodium, rhodium, ruthenium, molybdenum, niobium, zirconium, yttrium, barium, lanthanum, hafnium, tungsten, rhenium, osmium, or iridium;    (7) a method for storing hydrogen, comprising immersing in a gaseous mixture comprising hydrogen, a hydrogen storage composition comprising a catalyst composition disposed upon a storage composition; dissociating the hydrogen into atomic hydrogen; and storing the atomic hydrogen in the storage composition;    (8) a method for generating hydrogen, comprising heating a hydrogen storage composition comprising a catalyst composition disposed upon a storage composition;    (9) a method for the storage and recovery of hydrogen, comprising contacting a hydrogen storage composition with a first gaseous mixture comprising a first concentration of hydrogen, dissociating the hydrogen into atomic hydrogen, storing the atomic hydrogen in the storage composition, contacting the hydrogen storage composition with a second gaseous mixture comprising a second concentration of hydrogen, and heating the hydrogen storage to a temperature effective to facilitate the desorption of hydrogen from the hydrogen storage composition; and    (10) a system for the storage and recovery of hydrogen, comprising a hydrogen generation reactor in fluid communication with a hydride recycle reactor, where the hydrogen generation reactor utilizes hydrides borosilicides, carbosilicides, nitrosilicides, aluminides, borocarbides, boronitrides, or carbides to recover hydrogen.    DESCRIPTION OF DRAWING(S) - The figure is a schematic showing the arrangement of diffusion multiple assembly in a silicon substrate.