NOVELTY - A generator includes at least two individual electrochemical cells (17) spaced from each other to form a stack. Each electrochemical cell comprises a central ionic conductor, a left-side electrode and a right-side electrode. Current collectors (23) are respectively connected to left-side and right-side electrodes and have respective terminals. An electrical power source is connected between first and fourth electrical terminals. The cell stack is located in a reservoir chamber of primary container. An aqueous solution, e.g. solid organic acid, is located in the reservoir chamber.    USE - The generator is used for producing carbon dioxide and hydrogen from organic carboxylated acid solution. Carbon dioxide is used for fire extinguishing systems; carbonation of soft drinks, beer and wine; freezing of food products; refrigeration and maintenance of environmental conditions during transportation of food products; enhancement of oil recovery from wells; materials production (plastics, rubber); treatment of alkaline water; dry ice pellets for sand blasting surfaces; creation of inert blankets or environments; prevention of fungal and bacterial growth; as additive to oxygen for medical use, e.g. as a propellant in aerosol cans; or to maintain 1000 ppm level in green houses to increase production yields of vegetables and flowers.    ADVANTAGE - The generator can controllably generate substantial quantities of carbon dioxide and does not require combustion or biological process, while producing carbon dioxide on demand in an economical manner.    DETAILED DESCRIPTION - A generator includes at least two individual electrochemical cells spaced from each other to form a stack having a left end and a right end. Each of first and second electrochemical cells comprises a central ionic conductor, a left-side electrode pressed against the left outer surface of conductor, and a right-side electrode pressed against the right outer surface of conductor. The first electrochemical cell is located at the left end of the stack. The second electrochemical cell is located at the right end of the stack. A first current collector is connected to the first left-side electrode and has a first electrical terminal. A second current collector is connected to the first right-side electrode and has a second electrical terminal. A third current collector is connected to the second left-side electrode and has a third electrical terminal. The second and third current collectors are electrically connected to each other in series. A fourth current collector is connected to the second right-side electrode and has a fourth electrical terminal. An electrical power source is electrically connected between first and fourth electrical terminals. The stack of electrochemical cells is located in a reservoir chamber of primary container. An aqueous solution, e.g. solid organic acid, is located in the reservoir chamber.    DESCRIPTION OF DRAWING(S) - The figure is a schematic front perspective view of a multi-cell generator stack.    Electrochemical cells (17)    Separators (18)    Stack end plates (20)    Compression rods (21)    Current collectors (23)    Flaps (24)