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The regenerative hydrogen-oxygen ion-exchange membrane fuel cell is especially suitable for use in space power systems. During discharge, the anode reaction is H2+20H-??2H2O+2e. The electrons pass out of the fuel cell at the anode to the load, then re-enter at the cathode. The cathode reaction is ??02+H2O+2e ??20H-. The hydroxyl ions pass through the membrane to the anode; the electrical circuit is...