The present invention is directed to an oxygen generator comprising a composition for generating oxygen and an acidic compound, wherein the composition for generating oxygen comprises an oxygen source, an ionic liquid, a metal oxide compound and optionally a basic compound, and wherein the oxygen source comprises a peroxide compound, the ionic liquid is in the liquid state at least in a temperature range from -10°C to +50°C, the metal oxide compound is an oxide of a single metal or of two or more different metals, said metal(s) being selected from the metals of groups 2 to 14 of the periodic table of the elements. The present invention also relates to a method for decelerating or stopping the oxygen production of an oxygen generating composition, and to a device for generating oxygen in a controlled manner.
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