Water electrolyzer and system

Details Water electrolyzer and system Water electrolyzer and system

2005-09-06

2005-09-06

King, Roy (Department: 1742)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

Reexamination Certificate

active

06939449

ABSTRACT:
An electrolyzer for generating hydrogen by the electrolytic dissociation of water employs anode and cathode half-cells, separated by a planar polymer-based solid electrolyte, and includes a water reservoir for independently maintaining a desired level of water in the anode and cathode half-cells. A hydrogen exit chimney extends vertically upward from each cathode half-cell and enters a separation chamber; a gas exit passageway therefrom is closed by a separation membrane that allows the passage of H2but rejects liquid H2O, while a return water passageway enters near the bottom of the cathode half-cell. The half-cells are preferably formed by molded plastic frames that are arranged as a cell stack containing a plurality of electrolytic cells, with flat metal anodes and cathodes being respectively sandwiched about the solid electrolyte membrane in each cell. A pair of flat crushable metal plates are located at each end of the cell stack adjacent a pair of pressure plates that exert axial squeezing pressure to seal the cells. Specially designed, dual metal-hydride cartridges are used to provide larger quantities of H2from a single cartridge; a high temperature metal hydride is provided in a rear region of the cartridge that is heated by an electrical resistance heater to a temperature of about 200° C. or above while room temperature metal hydride powder fills a front section of the cartridge.

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