NOVELTY - An electrochemical conversion system includes a heater which vaporizes a working fluid stream to cause a low partial pressure of ionizable gas adjacent a second electrode and therefore a pressure differential of ionizable gas across an ion conductive material which in turn causes the ionizable gas to pass through the ion conductive material creating an electric potential difference.    USE - For the conversion of heat energy to electrical energy.    ADVANTAGE - The system does not require a continuous source of reactant, does not require an electrolyte which may be plugged over time, and which may be operated at low temperatures.    DETAILED DESCRIPTION - An electrochemical conversion system comprises an ion conductive material, a first electrode (28) mounted upon one side of the ion conductive material, and a second electrode (29) mounted upon one side of the ion conductive material opposite the first electrode. A housing (11) containing a working fluid stream is included in combination with an electrochemical cell (23) defining a first pathway, which directs the working fluid stream past the first electrode. A heater (24) is thermally coupled to the housing for heating the fluid stream to a vapor phase prior to passing past the second electrode. A cooler (25) is thermally coupled to the housing for cooling the fluid stream to a liquid phase subsequent to passing the electrochemical cell. A stream of ionizable gas is in fluid communication with the second electrode. The heater vaporizes the working fluid stream so as to cause a low partial pressure of ionizable gas adjacent the second electrode and therefore a pressure differential of ionizable gas across the ion conductive material which in turn causes the ionizable gas to pass through the ion conductive material creating an electric potential difference. The ionizable gas is then entrained into the vaporized working fluid stream.    An INDEPENDENT CLAIM is also included for a method of producing electricity comprising providing an electrochemical cell coupled to a load, vaporizing a two phase fluid, passing the vaporized two phase fluid past one side of the electrochemical cell, and entraining the ionizable gas passed through the electrochemical cell into the vaporized two phase fluid.    DESCRIPTION OF DRAWING(S) - The figure shows an schematic view of an electrochemical conversion system.    Housing (11)    Electrochemical cell (23)    Heater (24)    Cooler (25)    First electrode (28)    Second electrode (29)