TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The hydrogen-developing components (1) and (2) are arranged alternatively in the vessel with respect to hydrogen-developing and catalyzing surfaces embedded in the electrolyte. A meander-shaped, comb-shaped or spiral-shaped hydrogen-developing component is arranged interdigitated or coaxially spiral configuration, in order to make the hydrogen-developing surfaces and catalyzing surfaces are alternate with each other. The catalyzer sheets and hydrogen-developing components are arranged in such a way that the distance between the opposing surfaces is 1-10 mm, preferably 3-5 mm. The catalyzer sheets and the hydrogen-developing components are arranged in such a way that each catalyzer sheet touches and covers hydrogen-developing surface of each hydrogen-developing component, in order to expose the corresponding hydrogen-developing surface to the electrolyte in the mesh openings (10d) or perforations of the catalyzer sheet. Preferred Device: The hydrogen generator device consists of electrolyte supply unit for supplying fresh electrolyte into the vessel and/or reaction product discharge unit for discharging particulate hydrogen generation reaction product from the vessel. The reactor vessel consists of water inlet, hydrogen outlet, steam outlet and control unit for controlling the intake of the water or electrolyte, and output of steam produced in the reactor by exothermal reaction at electrolyte-contacting surfaces of the hydrogen-developing components. In hydrogen generator device, the hydrogen-developing components and catalyzer sheets are arranged in hermetically closed reactor vessel, for additionally producing steam. The control unit consists of start/stop unit for starting or stopping the hydrogen production and steam generation.    TECHNOLOGY FOCUS - METALLURGY - Preferred Composition: The support structure has metal mesh or perforated metal sheet made from steel or copper, or plastic mesh or perforated plastic sheet made from polymer material (10b). The coating comprises nickel, cobalt, molybdenum, manganese, iron and/or alloy, or nitride or carbon, preferably ceramic or polymeric binder/adhesive matrix. Preferred Properties: The mesh or sheet has thickness of 20 mu m-2 mm, preferably 1-5 mm. The coating has nano or microporous surface with surface roughness of 200 nm-1 mm, preferably 2-5 mu m. The catalyzer sheet has overall flat, cylindrical or spiral plate shape. The hydrogen-developing component has plate-shape or cylindrical shape.