Device making it possible to implement a method for managing fluids necessary for the operation of a fixed or movable installation, consisting, based on a hydrogen peroxide solution subjected to an electric current produced by an electricity supply source, of having, by one single oxidation operation, at least two fluids necessary for the operation of a fixed or movable installation, the device being CHARACTERISED IN THAT it comprises: an oxidation cell which, comprising said electricity supply source, is equipped with an anode where said oxidation is carried out and a cathode separated by a cationic membrane which only lets ions (H+) pass, the positive pole of the supply source being connected to the anode, said anode being covered with a membrane which is permeable to the hydrogen peroxide molecule, impermeable to water, permeable to ions, to implement the following operations: - a pre-concentration operation of the peroxide to be oxidised by bringing it into contact with the permeable membrane (electrode connected to the + pole of a generator), - an anodic oxidation operation on the anode of the hydrogen peroxide element for the purpose of producing dioxygen, water and hydrogen cations by subjecting said hydrogen peroxide to an electric current produced by an electricity supply source, - a cathodic reduction operation (on a cathode connected to the - pole of a generator and separated from the anode by an H+ ion exchange membrane), hydrogen cations from said anodic oxidation operation for the purpose of producing dihydrogen, a tank compartmentalised by a deformable wall into a lower volume and an upper volume, the lower volume receiving a hydrogen peroxide solution, the upper volume receiving the water produced by the anodic oxidation operation, the various elements being arranged such that the volume of water weighs on the volume of peroxide, the peroxide solution exiting from the tank under the effect of the weight of the water and supplies the cell, the compartmentalisation by flexible wall having the technical effect that when one of the liquids loses volume, the other liquid takes this without the total volume of the tank changing, and a separate tank for storing the hydrogen produced. an oxidation cell which, comprising said electricity supply source, is equipped with an anode where said oxidation is carried out and a cathode separated by a cationic membrane which only lets ions (H+) pass, the positive pole of the supply source being connected to the anode, said anode being covered with a membrane which is permeable to the hydrogen peroxide molecule, impermeable to water, permeable to ions, to implement the following operations: - a pre-concentration operation of the peroxide to be oxidised by bringing it into contact with the permeable membrane (electrode connected to the + pole of a generator), - an anodic oxidation operation on the anode of the hydrogen peroxide element for the purpose of producing dioxygen, water and hydrogen cations by subjecting said hydrogen peroxide to an electric current produced by an electricity supply source, - a cathodic reduction operation (on a cathode connected to the - pole of a generator and separated from the anode by an H+ ion exchange membrane), hydrogen cations from said anodic oxidation operation for the purpose of producing dihydrogen, - a pre-concentration operation of the peroxide to be oxidised by bringing it into contact with the permeable membrane (electrode connected to the + pole of a generator), - an anodic oxidation operation on the anode of the hydrogen peroxide element for the purpose of producing dioxygen, water and hydrogen cations by subjecting said hydrogen peroxide to an electric current produced by an electricity supply source, - a cathodic reduction operation (on a cathode connected to the - pole of a generator and separated from the anode by an H+ ion exchange membrane), hydrogen cations from said anodic oxidation operation for the purpose of producing dihydrogen, a tank compartmentalised by a deformable wall into a lower volume and an upper volume, the lower volume receiving a hydrogen peroxide solution, the upper volume receiving the water produced by the anodic oxidation operation, the various elements being arranged such that the volume of water weighs on the volume of peroxide, the peroxide solution exiting from the tank under the effect of the weight of the water and supplies the cell, the compartmentalisation by flexible wall having the technical effect that when one of the liquids loses volume, the other liquid takes this without the total volume of the tank changing, and a separate tank for storing the hydrogen produced.