TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The fuel is combined with a solid stabilizer agent consisting of metal hydroxides, anhydrous metal metaborates and/or hydrated metal metaborates. The method further comprises contacting the fuel with a co-catalyst; dispersing the acidic reagent solution before contacting the solid borohydride; and generating a hydrated borate having a molar ratio of water to boron of 1:1. The dispersing step reduces the size of the droplets of the acidic reagent solution using atomizers, spray nozzles, or sparge tubes. The reactor temperature is maintained at below 100degreesC. The method further comprises converting the solid borohydride to hydrogen and a borate compound by hydrolyzing the borohydride in the presence of the acidic solution; and cooling the hydrogen. Preferred Compositions: The molar ratio of water to borohydride is 4:1-5.3:1 (preferably 4:1). The concentration of the acidic reagent is 0.1-17 (preferably 1-10) M. The ratio of boron to water in the borate compound is 1:2, 2:5 or 1:1. Preferred Materials: The fuel comprises sodium borohydride, lithium borohydride, potassium borohydride, and/or calcium borohydride. It comprises sodium borohydride dihydrate, potassium borohydride trihydrate, and/or potassium borohydride monohydrate. The reagent is in the form of solid or liquid solution. The co-catalyst comprises a transition metal salt such as cobalt salt, nickel salt or copper salt. The reagent comprises hydrochloric acid, sulfuric acid, or phosphoric acid. The solid borohydride is provided in the form of granules, pellets and/or powder. The solid borohydride comprises sodium borohydride, and the acidic solution comprises hydrochloric acid.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The hydrogen gas generation system further comprises a conduit (108) for conveying the reagent solution from the second region to the first region; hydrogen gas outlet in communication with the first region; and control mechanism (110) for regulating the flow of reagent solution from the second region to the first region. The control mechanism comprises a pressure control valve or pump. At least one of the first and second regions is bounded by a movable or flexible material to provide a volume exchanging configuration.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The fuel is combined with a solid stabilizer agent consisting of metal hydroxides, anhydrous metal metaborates and/or hydrated metal metaborates. The method further comprises contacting the fuel with a co-catalyst; dispersing the acidic reagent solution before contacting the solid borohydride; and generating a hydrated borate having a molar ratio of water to boron of 1:1. The dispersing step reduces the size of the droplets of the acidic reagent solution using atomizers, spray nozzles, or sparge tubes. The reactor temperature is maintained at below 100degreesC. The method further comprises converting the solid borohydride to hydrogen and a borate compound by hydrolyzing the borohydride in the presence of the acidic solution; and cooling the hydrogen. Preferred Compositions: The molar ratio of water to borohydride is 4:1-5.3:1 (preferably 4:1). The concentration of the acidic reagent is 0.1-17 (preferably 1-10) M. The ratio of boron to water in the borate compound is 1:2, 2:5 or 1:1. Preferred Materials: The fuel comprises sodium borohydride, lithium borohydride, potassium borohydride, and/or calcium borohydride. It comprises sodium borohydride dihydrate, potassium borohydride trihydrate, and/or potassium borohydride monohydrate. The reagent is in the form of solid or liquid solution. The co-catalyst comprises a transition metal salt such as cobalt salt, nickel salt or copper salt. The reagent comprises hydrochloric acid, sulfuric acid, or phosphoric acid. The solid borohydride is provided in the form of granules, pellets and/or powder. The solid borohydride comprises sodium borohydride, and the acidic solution comprises hydrochloric acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The reagent comprises acetic acid, formic acid, maleic acid, citric acid or tartaric acid.