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1
US20040224215A1
Publication/Patent Number: US20040224215A1
Publication date: 2004-11-11
Application number: 09/965,617
Filing date: 2001-09-27
Abstract: An electrode composition comprises a support material that is non-oxidizable at anodic potentials less than about 4 volts, and a catalyst material comprising active electrocatalytic sites. In another embodiment, the electrode can further comprise a proton conductive material disposed on the support and catalyst materials. An electrode composition comprises a support material that is non-oxidizable at anodic potentials less than about 4 volts, and a catalyst material comprising active electrocatalytic sites. In another embodiment, the electrode can further comprise a proton conductive material ...more ...less
2
US20030006145A1
Publication/Patent Number: US20030006145A1
Publication date: 2003-01-09
Application number: 10/224,070
Filing date: 2002-08-20
Abstract: An electrochemical cell system includes a hydrogen electrode; an oxygen electrode; a membrane disposed between the hydrogen electrode and the oxygen electrode; and a compartmentalized storage tank. The compartmentalized storage tank has a first fluid storage section and a second fluid storage section separated by a movable divider. The compartmentalized storage tank is in fluid communication with the electrochemical cell. Further, an electrochemical cell includes a hydrogen electrode; an oxygen electrode; an electrolyte membrane disposed between and in intimate contact with the hydrogen electrode and said oxygen electrode; an oxygen flow field disposed adjacent to and in intimate contact with the oxygen electrode; a hydrogen flow field disposed adjacent to and in intimate contact with the hydrogen electrode; a water flow field disposed in fluid communication with the oxygen flow field; and a media divider disposed between the oxygen flow field and the water flow field. An electrochemical cell system includes a hydrogen electrode; an oxygen electrode; a membrane disposed between the hydrogen electrode and the oxygen electrode; and a compartmentalized storage tank. The compartmentalized storage tank has a first fluid storage section and a second ...more ...less
3
US20030104263A1
Publication/Patent Number: US20030104263A1
Publication date: 2003-06-05
Application number: 09/965,679
Filing date: 2001-09-27
Abstract: An electrochemical cell includes a first electrode, a second electrode, a proton exchange membrane disposed between and in intimate contact with the electrodes, and a pressure pad disposed in electrical communication with the first electrode. The pressure pad is an electrically conductive sheet and is of a structure that is conformable to pressure variations within the cell. Methods of forming the pressure pad include disposing dimples or corrugations at the electrically conductive member. A method of maintaining compression within the cell includes disposing the electrically conductive member and the compression member at the first electrode, applying a load at the cell to compress the cell components, and maintaining electrical communication through the electrically conductive member. An electrochemical cell includes a first electrode, a second electrode, a proton exchange membrane disposed between and in intimate contact with the electrodes, and a pressure pad disposed in electrical communication with the first electrode. The pressure pad is an electrically ...more ...less
4
US20020079235A1
Publication/Patent Number: US20020079235A1
Publication date: 2002-06-27
Application number: 09/960,220
Filing date: 2001-09-21
Abstract: A method for operating an electrolysis cell at a range of pressures and current densities, the cell having an ultrathin composite membrane, preferably comprising an expanded polytetrafluoroethylene base material impregnated with a hydrogen conducting ionomer. The resulting membrane is unexpectedly durable and efficient when used in an electrolysis cell operating at high membrane pressure differentials, thereby allowing greater cell current densities and efficiency. A method for operating an electrolysis cell at a range of pressures and current densities, the cell having an ultrathin composite membrane, preferably comprising an expanded polytetrafluoroethylene base material impregnated with a hydrogen conducting ionomer. The resulting ...more ...less
5
US20020022173A1
Publication/Patent Number: US20020022173A1
Publication date: 2002-02-21
Application number: 09/909,846
Filing date: 2001-07-20
Abstract: A compression member for an electrochemical cell stack is provided. The compression member includes a first surface including a plurality of raised portions, a second surface including a substantially flat surface, and an edge defined by the first surface and the second surface. The plurality of raised portions is aligned to define a plurality of receiving areas. The plurality of raised portions and the plurality of receiving areas are configured such application of an axial compressive force spreads the plurality of raised portions into the plurality of receiving areas. The edge includes a portion configured to receive an electrochemical cell terminal therethrough. The compression member is formed of electrically non-conductive materials. A compression member for an electrochemical cell stack is provided. The compression member includes a first surface including a plurality of raised portions, a second surface including a substantially flat surface, and an edge defined by the first surface and the second surface ...more ...less
6
US20020000385A1
Publication/Patent Number: US20020000385A1
Publication date: 2002-01-03
Application number: 09/736,964
Filing date: 2000-12-14
Abstract: An electrochemical cell system includes a hydrogen electrode; an oxygen electrode; a membrane disposed between the hydrogen electrode and the oxygen electrode; and a compartmentalized storage tank. The compartmentalized storage tank has a first fluid storage section and a second fluid storage section separated by a movable divider. The compartmentalized storage tank is in fluid communication with the electrochemical cell. Further, an electrochemical cell includes a hydrogen electrode; an oxygen electrode; an electrolyte membrane disposed between and in intimate contact with the hydrogen electrode and said oxygen electrode; an oxygen flow field disposed adjacent to and in intimate contact with the oxygen electrode; a hydrogen flow field disposed adjacent to and in intimate contact with the hydrogen electrode; a water flow field disposed in fluid communication with the oxygen flow field; and a media divider disposed between the oxygen flow field and the water flow field. An electrochemical cell system includes a hydrogen electrode; an oxygen electrode; a membrane disposed between the hydrogen electrode and the oxygen electrode; and a compartmentalized storage tank. The compartmentalized storage tank has a first fluid storage section and a second ...more ...less
7
US20020051898A1
Publication/Patent Number: US20020051898A1
Publication date: 2002-05-02
Application number: 09/966,727
Filing date: 2001-09-28
Abstract: An exemplary embodiment of the regenerative electrochemical cell system comprises: a fuel cell module comprising a fuel cell oxygen inlet in fluid communication a water storage device, and a fuel cell hydrogen inlet in fluid communication with both an oxygen source and with a gaseous portion of an water phase separation device; an electrolysis module comprising an electrolysis water inlet in fluid communication with the water storage device via a fuel cell oxygen outlet, and an electrolysis water outlet in fluid communication with the fuel cell hydrogen. One of the embodiments for operating a regenerative electrochemical cell system disclosed herein, comprises: introducing feed hydrogen from a hydrogen storage system to a fuel cell hydrogen electrode and introducing feed oxygen from an oxygen/water phase separation device to a fuel cell oxygen electrode; reacting hydrogen ions with the oxygen to generate electricity and water; once the fuel cell has attained operating conditions, ceasing the feed oxygen from the oxygen/water phase separation device, and introducing second oxygen from a surrounding atmosphere module to the fuel cell oxygen electrode; directing the water to a water storage device; introducing water to an electrolysis water electrode and power to an electrolysis module, to produce refuel hydrogen and oxygen; and directing the refuel hydrogen to the hydrogen storage device. An exemplary embodiment of the regenerative electrochemical cell system comprises: a fuel cell module comprising a fuel cell oxygen inlet in fluid communication a water storage device, and a fuel cell hydrogen inlet in fluid communication with both an oxygen source and with a ...more ...less
8
US20020182472A1
Publication/Patent Number: US20020182472A1
Publication date: 2002-12-05
Application number: 10/137,991
Filing date: 2002-05-03
Abstract: An electrochemical cell includes a first electrode, a second electrode, a proton exchange membrane disposed between and in intimate contact with the electrodes, a pressure pad disposed in electrical communication with the first electrode, and a pressure distributor disposed adjacent to the pressure pad. The pressure pad may be an electrically conductive sheet and an elastomeric material disposed at the electrically conductive sheet. The pressure distributor may be a screen mesh. A method of distributing a load on a pressure pad includes disposing a screen mesh at an elastomeric material of the pressure pad and pressing the screen mesh into the elastomeric material. An electrochemical cell includes a first electrode, a second electrode, a proton exchange membrane disposed between and in intimate contact with the electrodes, a pressure pad disposed in electrical communication with the first electrode, and a pressure distributor disposed ...more ...less
9
US20010049044A1
Publication/Patent Number: US20010049044A1
Publication date: 2001-12-06
Application number: 09/747,550
Filing date: 2000-12-22
Inventor: Molter, Trent M.  
Abstract: An electrochemical cell arrangement using a bipolar plate is disclosed, wherein the bipolar plates are formed from single or multiple sheets of metal foil, preferably titanium, embossed with the fluid fields. The bipolar plate, which forms the oxygen, hydrogen, and coolant passages and acts as a separator between adjacent cells of a cell stack, is lightweight, small compared to conventional bipolar plates, ductile, inexpensive, and easy to produce. An electrochemical cell arrangement using a bipolar plate is disclosed, wherein the bipolar plates are formed from single or multiple sheets of metal foil, preferably titanium, embossed with the fluid fields. The bipolar plate, which forms the oxygen, hydrogen, and coolant ...more ...less
10
US20010004050A1
Publication/Patent Number: US20010004050A1
Publication date: 2001-06-21
Application number: 09/757,226
Filing date: 2001-01-09
Abstract: The present invention is an integrated screen comprising a screen portion having openings and an integral protector edge disposed about the periphery of the screen portion. This integrated screen protector edge can be utilized individually as the membrane support/flow field in an electrochemical cell or in conjunction with one or more subsequent screen layers. When utilized with subsequent screen layers, the integrated screen protector edge is disposed adjacent to and in intimate contact with the membrane assembly. The present invention is an integrated screen comprising a screen portion having openings and an integral protector edge disposed about the periphery of the screen portion. This integrated screen protector edge can be utilized individually as the membrane support/flow field in ...more ...less
11
US20010013469A1
Publication/Patent Number: US20010013469A1
Publication date: 2001-08-16
Application number: 09/835,502
Filing date: 2001-04-16
Abstract: The present invention relates to a unique electrochemical cell stack which employs an electrically conductive pressure pad. The pressure pad is composed of material compatible with the electrochemical cell environment and is disposed on the high pressure side of the membrane assembly, in intimate contact with the high pressure side screen pack. The present invention relates to a unique electrochemical cell stack which employs an electrically conductive pressure pad. The pressure pad is composed of material compatible with the electrochemical cell environment and is disposed on the high pressure side of the membrane ...more ...less
12
US20010008722A1
Publication/Patent Number: US20010008722A1
Publication date: 2001-07-19
Application number: 09/802,191
Filing date: 2001-03-08
Abstract: An integral screen/frame assembly for use in an electrochemical cell for supporting and facilitating the hydration of a solid membrane. The screen/frame assembly is comprised of planar screen layers having the frame disposed about the periphery of those layers such that the frame bonds the layers together. An integral screen/frame assembly for use in an electrochemical cell for supporting and facilitating the hydration of a solid membrane. The screen/frame assembly is comprised of planar screen layers having the frame disposed about the periphery of those layers such that the ...more ...less