TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is a metal of the group VIIIB. The metal is cobalt, nickel, platinum or ruthenium. The fuel solution comprises an aqueous solution of sodium borohydride.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The step of providing the first silicon die comprises providing the first silicon die with silicon atoms oriented along a first Miller plane (100). The anisotropic etching defines many ridges to form a pyramid-like shape. The anisotropically etching defines the pyramid-like shaped ridges to have a square base and side walls with an inclination of an angle equal to 54 degrees with respect to the square base. The step of providing the first silicon die comprises providing the first silicon die to have silicon atoms oriented along a second Miller plane (110). The anisotropic etching defines many ridges to have side walls substantially perpendicular to the active surface of the first silicon die. The anisotropically etching comprises a wet chemical etching using potassium hydroxide and a silicon dioxide mask with non-uniform openings. The anisotropic etching forms many notches and ridges to be shaped in relation to a width of the non-uniform openings and to physical parameters of the wet chemical etching. The anisotropic etching occurs at room temperature. The duration of the anisotropic etching is about 120 hours. The anisotropically etching comprises using a solution comprising potassium hydroxide (30 wt.%) and distilled water. The method further comprises mapping protected areas prior to the anisotropic etching, the mapping of protected areas comprising defining, by photolithographic techniques, areas that are not subject to the anisotropic etching and formatting of a microchannel in the active surface prior to the anisotropic etching. The step of depositing a layer of the catalyst occurs via sputtering. The method further comprises forming a first input hole and a second output hole in the first silicon die, the first and second holes being respectively in fluid communication with a first tank for storing a fuel solution for reacting with the catalyst, and a second tank for storing by-products. Preferred Components: The microreactor further comprises: a fuel solution flowing above the catalyst layer for reacting with the catalyst; a first tank (3) for storage of a fuel solution; a second tank (4) for storage of by-products; and a second silicon die on the first silicon die, and a semipermeable membrane positioned between them. The ridge comprises many pyramid-like shaped ridges, where each pyramid-shaped ridge comprises the square base and side walls. The active surface further comprises a microchannel positioned between the first output hole and second output hole.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solution further comprises isopropyl alcohol for increasing the anisotropy of the anisotropic etching.