NOVELTY - The self-regulated gas generator comprises a substrate (12) containing a set of wells (20) or holes, where each well or hole contains inner surfaces, a catalyst layer (26) formed on the inner surfaces of the set of wells or holes, and a gas generating source in liquid phase arranged over the wells or holes. The substrate comprises an electrically conductive material. The wells or holes comprise an array. The substrate contains first and second surfaces. The generator further comprises a unit for consuming the gas; and a gas generating source in liquid phase arranged over the catalyst layer.    USE - The self-regulated gas generator is useful in a fuel cell (claimed) that is useful in an electronic device, where the generator is useful as a self-regulated cathode.    ADVANTAGE - The generator self-regulates the supply of oxidant without the need of any ancillary parts such as oxygen tanks, pumps and valves thus allowing miniaturization of the fuel cell to below a centimeter-scale, eliminates the need for air-breathing cathodes to face the ambient air to ensure ample air convection, and improves performance of the fuel cell in an environment-friendly manner.    DETAILED DESCRIPTION - The self-regulated gas generator comprises a substrate (12) containing a set of wells (20) or holes, where each well or hole contains inner surfaces, a catalyst layer (26) formed on the inner surfaces of the set of wells or holes, and a gas generating source in liquid phase arranged over the wells or holes. The substrate comprises an electrically conductive material. The wells or holes comprise an array. The substrate contains first and second surfaces. The generator further comprises a unit for consuming the gas; and a gas generating source in liquid phase arranged over the catalyst layer. The patterned catalyst layer is formed on one of the first and second surfaces and comprises a set of discrete spots of catalyst; An INDEPENDENT CLAIM is included for a fuel cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic sectional view of a self-regulated, gas generating substrate.    Substrate (12)    Wells (20)    Bottom surface (22)    Side surface (24)    Catalyst layer. (26)