NOVELTY - Electrochemical cell (10) comprises anolyte compartment (15) holding an anolyte (20) comprising an anode (25) in contact with the anolyte, where the anolyte comprises an oxidizable substance having a lower standard oxidation potential than water; a catholyte compartment (30) comprising a cathode (40) in contact with the catholyte (35), where catholyte comprises a reducible substance that is electrochemically reducible to form hydrogen; and an alkali cation conductive membrane (45), positioned between the anolyte and catholyte compartment.    USE - As electrochemical cell for producing hydrogen (claimed).    ADVANTAGE - The methods are able to produce hydrogen through a method that uses less electrical energy than does the production of hydrogen through some traditional methods for producing hydrogen gas through the electrolysis of water. The systems and methods are more efficient and/or less expensive than some conventional methods of water electrolysis.    DETAILED DESCRIPTION - Electrochemical cell (10) comprises anolyte compartment (15) holding an anolyte (20), the anolyte compartment comprising an anode (25) in contact with the anolyte, where the anolyte comprises an oxidizable substance having a lower standard oxidation potential than water; a catholyte compartment (30) holding a catholyte (35), the catholyte compartment comprising a cathode (40) in contact with the catholyte, where the catholyte comprises a reducible substance that is electrochemically reducible to form hydrogen; and an alkali cation conductive membrane (45) selective to an alkali metal cation, the membrane being positioned between the anolyte compartment and the catholyte compartment. An INDEPENDENT CLAIM is included for producing hydrogen, involving: providing an electrochemical cell comprising: an anolyte compartment holding an anolyte, the anolyte compartment comprising an anode in contact with the anolyte, where the anolyte comprises an oxidizable substance having a lower standard oxidation potential than water; a catholyte compartment holding a catholyte, the catholyte compartment comprising a cathode in contact with the catholyte, where the catholyte comprises a reducible substance that is electrochemically reducible to form hydrogen; and an alkali cation selective membrane that separates the anolyte compartment from the catholyte compartment; and passing an electrical potential between the anode and the cathode to reduce the reducible substance and produce hydrogen; and to oxidize an iodide ion from the alkali metal iodide to form molecular iodine; and reacting the molecular iodine with an alkali hydroxide to regenerate the alkali metal iodide.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the electrochemical cell.    Electrochemical cell (10)    Anolyte compartment (15)    Anolyte (20)    Anode (25)    Catholyte compartment (30)    Catholyte (35)    Cathode (40)    Alkali cation conductive membrane (45)