NOVELTY - Reactant(s) is disposed on substrate comprising silicon, silicon carbide, silicon nitride or silicon boride. The reactant is lithium, magnesium, sodium, potassium, calcium and/or aluminum. The substrate is heat-treated to form diffusion multiple having at least two phases. The diffusion multiple is contacted with hydrogen. Subsequently, absorption and/or desorption of hydrogen are detected, to make combinatorial library.    USE - For making combinatorial library to determine silicides, boro silicides, carbo silicides and nitro silicides used for storage of hydrogen (claimed) for use in generation of energy in fuel cell applications for automobiles, home and apartments, and manufacturing industries.    ADVANTAGE - The method is effective in developing combinatorial library to determine silicides, boro silicides, carbo silicides and nitro silicides which are subsequently hydrogenated to efficiently store hydrogen. The method permits simultaneous large scale testing of wide variety of materials. The high efficiency methodology facilitates formation of large number of controlled compositional variations in bulk samples for fast and systematic surveys of bulk properties of the silicides. The combinatorial libraries when used in conjunction with micro analytical techniques, such as electron probe microanalysis and electron backscatter diffraction analysis, can be additionally used for efficient survey of phase equilibria, coefficients, precipitation kinetics, properties and composition phase-property relationships for accelerated design of multi-component alloys and systems. The reactants are generally placed into the holes in loose form. The ability of light metal diffusion multiple to reversibly absorb and desorb hydrogen may be detected by several analytical techniques.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method of regenerating hydrogen. At least one compound (I) chosen from alloy of aluminum and silicon, calcium and silicon (Ca2Si, CaSi, CaSi2), potassium and silicon (KSi, K4Si23), lithium and silicon (Li22Si5, Li13Si4, Li7Si3, Li12Si7), magnesium and silicon (Mg2Si), and/or sodium and silicon (NaSi, NaSi2, Na4Si23), is contacted in hydrogen to form a hydrogenated compound. The hydrogenated compound is heated to recover hydrogen;    (2) energy generation device, which is employed to generate energy;    (3) compound of diffusion multiple having a formula: (Lia, Nab, Kc, Ald, Mge, Caf)x(B, C, N, Si)y, where Li is lithium, Na is sodium, Mg is magnesium, K is potassium, Ca is calcium, Al is aluminum, B is boron, C is carbon, N is nitrogen, Si is silicon, a-f is 0-1 and x and y are 1-22;    (4) composition comprising hydride of compound (I); and    (5) system for storage and recovery of hydrogen, which consists of a hydrogen generation reactor in fluid communication with a hydride recycle reactor. The hydrogen generation reactor utilizes hydrides of light metal silicide, boro silicide, carbo silicide and nitro silicide, to recover hydrogen.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic diagram of system for generation of hydrogen from hydrides of light metal silicides, boro silicides, carbo silicides and nitro silicides.