NOVELTY - The self-regulating hydrogen generation device useful in a system e.g. fuel cell, comprises a first chamber for holding a liquid and first substance, a second chamber adjacent to the first chamber for holding a second substance, a third chamber adjacent to the second chamber for holding gas, a first separation element arranged between the first and second chambers, a second separation element arranged between the second and third chambers, and a toroidal-shaped water absorption element. The first substance is a source of hydrogen, and is soluble in the liquid.    USE - The self-regulating hydrogen generation device is useful in a system (claimed) such as fuel cell, internal combustion engine and gas torch for generating electrical, mechanical or thermal energies.    ADVANTAGE - The self-regulating hydrogen generation device has highly specific technical characteristics, can be simply manufactured with improved durability, and is simple and safe to use and portable.    DETAILED DESCRIPTION - The self-regulating hydrogen generation device useful in a system e.g. fuel cell, comprises a first chamber for holding a liquid and first substance, a second chamber adjacent to the first chamber for holding a second substance, a third chamber adjacent to the second chamber for holding gas, a first separation element arranged between the first and second chambers, a second separation element arranged between the second and third chambers, and a toroidal-shaped water absorption element. The first substance is a source of hydrogen, and is soluble in the liquid. The second substance catalyzes a reaction, which involves the first substance and results in the formation of hydrogen gas. The first separation element is liquid-permeable, and allows liquid to pass from the first chamber into the second chamber. The second separation element is liquid-impervious and gas-pervious thus allowing hydrogen gas present in the second chamber to pass into the third chamber. The first substance is physically separated from the first chamber. A liquid diluent is useful for diluting the first substance prior to using the device for the generation of hydrogen. The first chamber comprises two puncturable/breakable containers or compartments of which one holds the first substance in undiluted or concentrated form and another holds liquid diluent. The second substance comprises a transition metal in elemental form or a transition metal oxide, and is present on a carrier, which comprises carbon/ceramic material. The carrier is present as a sheet, a plate, a honeycomb structure, a cylindrical structure or granules. The first and second separation elements comprise a hydrophilic membrane. The first separation element has a thickness of 20-250 mu m or a pore size of 10-100 mu m. The second separation element has a thickness of 20-300 mu m or a pore size of 0.5-5 mu m. The second separation element comprises a membrane having a gas permeability pressure of 20-100 mbar, which is less than a gas permeability pressure of a membrane of the first separation element. The first chamber comprises a pressure compensating system, which comprises a hydrophobic membrane. The third chamber comprises a valve system, which is activated to allow hydrogen gas to exit the third chamber. A part of walls of the first chamber is flexible. An internal volume of the first, second and third chambers is 20-100 cm3, 0.1-5 cm3 and 0.2-10 cm3 respectively. An INDEPENDENT CLAIM is included for:    (1) a system;    (2) a hydrogen-based fuel cell; and    (3) a method of generating hydrogen gas in a self-regulating manner.    DESCRIPTION OF DRAWING(S) - The diagram shows a side cross-section view of a hydrogen generation device.    Electrodes module (2)    Liquid fuel chamber (3)    Valves (4)    Hydrogen generation chamber (5)    Catalytic element. (6)