NOVELTY - A self-regulating hydrogen generation device (1) comprises: at least one first chamber (3) for holding a liquid and at least one first substance which is a source of hydrogen and is at least partly soluble in the liquid; a catalytic member (6) capable of catalyzing a reaction which involves the first substance and results in the formation of hydrogen gas; and a first separation element (9) which is liquid-permeable and capable of allowing liquid to pass from first chamber into a second chamber and a second separation element (7) which is liquid-impervious and gas-pervious.    USE - As self-regulating hydrogen generation device for generating hydrogen gas from a liquid particularly water (claimed) useful in applications such as a vehicle fuel cell power system.    ADVANTAGE - The device produces hydrogen in a self-regulating manner. The device is capable of allowing fuel and catalyst to interact to create hydrogen and can also regulate and/or stop this interaction when hydrogen ceases to be consumed. The hydrogen generators produce and supply hydrogen as required. In an emergency, it is possible to use water from sources, such as a lake, a river, seawater, etc for producing hydrogen. The hydrogen generator can be initially charged and/or provided with the solid fuel and water at a charging station. The hydrogen generator can also be recharged by pumping out the spent or used contents and collecting the same for the further use. In an emergency, the spent contents can even be discharged to the environment and/or to a landfill system because the contents or spent fuel is ecologically safe. The spent fuel can be regenerated by using as a fuel component for generating power at a recycling center; the spent fuel (borates) can be converted and/or broken down into raw materials for different applications, for example, detergents, cosmetics, etc. Preferably, the spent fuel is converted into components which can again be used in hydrogen generators. One benefit of the hydrogen generators, as compared with conventional hydrogen supplying systems (balloon), relates to the fact that they are self regulating and are a self contained system which minimizes infrastructure issues and provides for more efficient implementation.    DETAILED DESCRIPTION - A self-regulating hydrogen generation device (1) comprises: at least one first chamber (3) for holding a liquid and at least one first substance which is a source of hydrogen and is at least partly soluble in the liquid; a catalytic member (6) capable of catalyzing a reaction which involves the first substance and results in the formation of hydrogen gas; and a first separation element (9) which is liquid-permeable and capable of allowing liquid to pass from the first chamber into a second chamber (8) and a second separation element (7) which is liquid-impervious and gas-pervious. The catalytic member comprises a catalytic substance arranged on a carrier and a transition metal in elemental form or a transition metal oxide. The device further comprises a floating member comprising the first separation element; a flexible container containing the liquid and being movable from a first position where the liquid does not interact with the first substance and a second position where the liquid does interact with the first substance; a flexible container containing the liquid and being movable from a first position where the liquid does not interact with the catalytic member and a second position where the liquid does interact with the catalytic member; a flexible container containing the liquid and being movable from a first position where the liquid does not interact with the substance and catalytic member and a second position where the liquid does interact with the substance and catalytic member; and a shutter movable from a first position where the liquid is prevented from interacting with the catalytic member and a second position where the liquid is allowed to interact with the catalytic member. An INDEPENDENT CLAIM is included for generating hydrogen gas in a self-regulating manner, involving contacting the catalytic material with a liquid material capable of forming hydrogen gas when contacted with the catalytic material and at least one of: using the hydrogen gas thus formed for preventing fresh liquid material from contacting the catalytic material when a predetermined threshold gas pressure is reached; and allowing the liquid to pass through a first separation element which is liquid-permeable from the first chamber into a second chamber and allowing hydrogen gas to pass through a second separation element which is liquid-impervious and gas-pervious.    DESCRIPTION OF DRAWING(S) - The figure shows a side cross-section view of a combination of a hydrogen generation device and a fuel cell.    Hydrogen generation device (1)    Liquid fuel chamber (3)    Hydrogen generation chamber (5)    Catalytic member (6)    Second separator element (7)    First separator element (9)