NOVELTY - The catalytic system comprises a first component such as a catalyst for the hydrolysis reaction of metal borohydrides from hydrogen, and a second component such as a material in the form of solid whose dissolution reaction in water is exothermic and inert to the reactants and products of hydrolysis reaction. The first component is consisting of metal particles including the elements of group IIIA and group IIIB. The metal particles have a size of 5-100 nm, and are supported by a substrate having a porous structure. The substrate is selected from open cell foams and guards.    USE - The catalytic system is useful in a fuel cell for the hydrolysis of sodium borohydride and hydrogen (all claimed).    ADVANTAGE - The catalytic system allows the transformation reaction of borohydrides with metal hydrogen at high reactant concentrations thus capable of producing hydrogen with high yields and high reaction kinetics and improving the life and performance of the cell in a simple and economical manner.    DETAILED DESCRIPTION - The catalytic system comprises a first component such as a catalyst for the hydrolysis reaction of metal borohydrides from hydrogen, and a second component such as a material in the form of solid whose dissolution reaction in water is exothermic and inert to the reactants and products of hydrolysis reaction. The first component is consisting of metal particles including the elements of group IIIA and group IIIB. The metal particles have a size of 5-100 nm, and are supported by a substrate having a porous structure. The substrate is selected from open cell foams and guards, and metallic in nature and made of polymers or carbon. The second compound has a dissolution heat of greater than or equal to 20 KJ/mol, and is present in the form of block in contact with the substrate. Metal foam (2.1) in the form of hollow cylinder and grafted metal nanoparticles are used in the dissolution reaction. An INDEPENDENT CLAIM is included for a catalytic chamber.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a catalytic system.    Metal foam (2.1)    Central part (2.3)    Cylindrical piece. (2.4)