TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: The amino acid is at least one material selected from glycine, alanine, valine, leucine, isoleucine, threonine, serine, cysteine, cystine, methionine, aspartic acid, ornithine, asparagine, glutamic acid, lysine, arginine, histidine, phenylalanine, tyrosine, tryptophan, proline, and oxyproline.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: In operation (A), a solid additive is further added. In the method, 1 part by mole of the metal borohydride and 0.1 to 10 parts by mole of the zwitterionic material are mixed. Preferred Components: The solid additive is at least one material selected from silica, ceramics, polymers, glass, fibers, fabrics, textiles, wovens, nonwovens, alloys, zeolites, molecular sieves, graphite, metal oxides, metal borides, and metal nitrides. The amount of the solid additive is 1000 parts by volume to 10000 parts by volume based on 100 parts by weight of the solvent. The metal borohydride is sodium borohydride. The zwitterionic material is an amino acid; or betaines or ylides.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent is water or an organic solvent (preferably alcohol). The solvent is added in an amount of 100 to 10000 parts by weight based on 100 parts by weight of the metal borohydride. EXAMPLE - Glycine (1.99 g) was added to a reactor in which 1 g of sodium borohydride (NaBH4) was contained to obtain a mixing ratio of sodium borohydride to glycine of 2:1 (unit: mole) and then mixed. Deionized water (10 ml) was added to the mixture to dissolve the mixture. Subsequently, when hydrogen gas was generated, the flow rate of the generated hydrogen gas was measured using a mass flow controller connected to a computer. The flow rate of the hydrogen gas reached a peak of 218 ml/minutes within 10 minutes after the reaction. Then, a constant flow rate of about 7 ml/minutes was maintained for about 2 hours. A conversion of sodium borohydride was 93.53%.