US Patent 7326329 Commercial production of hydrogen from water

Large quantities of low cost hydrogen free of carbon oxides are required as fuel for the hydrogen economy. Commercial quantities of hydrogen can be produced from the electrolysis of water using a diaphragm-less electrolytic cell. The electrolytic cell has an anode cell (31) and a cathode cell (32) connected by a DC power source (53) and an external conductor (52). An alternate apparatus method to produce hydrogen is to electrolyze water using unipolar activation. Unipolar activation uses separate anode and cathode circuits and can use secondary cathode (132) and anode (139) cells to recover energy and produce further hydrogen.