Fuel cell and power chip technology

• US 6,815,110 B2
• Filed: 09/07/2001
• Issued: 11/09/2004
• Est. Priority Date: 11/24/1999
• Status: Expired due to Term

• Current Assignee: Encite, LLC
• Original Assignee: Integrated Fuel Cell Technologies Incorporated (Encite, LLC)
• Inventors: Marsh, Stephen A.
• Primary Examiner(s): Bell, Bruce F.
• Assistant Examiner(s): WILLS, MONIQUE M
• Application Number:
  US09/949,301
• Publication Number:
  US 20020045082A1
• Time in Patent Office: 1,159 Days
• Field of Search: 429/12, 429/13, 429/22, 429/23, 429/30, 429/32, 429/34, 429/35, 429/36, 429/39, 429/26, 429/38
• US Class Current: 429/431
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H01M 2300/0082 Organic polymers
• CPC Class Codes: H01M 8/0271 Sealing or supporting means around electrodes, matrices or membranes
• CPC Class Codes: H01M 8/0432 Temperature; Ambient temperature
• CPC Class Codes: H01M 8/04365 of other components of a fuel cell or fuel cell stacks
• CPC Class Codes: H01M 8/0438 Pressure; Ambient pressure; Flow
• CPC Class Codes: H01M 8/04552 of the individual fuel cell
• CPC Class Codes: H01M 8/04582 of the individual fuel cell
• CPC Class Codes: H01M 8/04619 of fuel cell stacks
• CPC Class Codes: H01M 8/04753 of fuel cell reactants
• CPC Class Codes: H01M 8/0488 of fuel cell stacks
• CPC Class Codes: H01M 8/0491 of fuel cell stacks
• CPC Class Codes: H01M 8/0494 of fuel cell stacks
• CPC Class Codes: H01M 8/1097 Fuel cells applied on a support, e.g. miniature fuel cells deposited on silica supports
• CPC Class Codes: H01M 8/1286 Fuel cells applied on a support, e.g. miniature fuel cells deposited on silica supports
• CPC Class Codes: H01M 8/241 with solid or matrix-supported electrolytes
• CPC Class Codes: H01M 8/2418 Grouping by arranging unit cells in a plane H01M8/2425, H01M8/244 take precedence
• CPC Class Codes: H01M 8/2457 with both reactants being gaseous or vaporised
• CPC Class Codes: H01M 8/249 comprising two or more groupings of fuel cells, e.g. modular assemblies
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y10T 29/49108 : Electric battery cell making
• CPC Class Codes: Y10T 29/53135 : Storage cell or battery

Abstract

A fuel cell is disclosed which is formed on a semiconductor wafer by etching channel in the wafer and forming a proton exchange membrane PEM barrier in the etched channel. The barrier divides the channel into two. A hydrogen fuel is admitted into one of the divided channels and an oxidant into the other reacts with a catalyst formed on an anode electrode at the hydrogen side of the channel to release hydrogen ions (protons) which are absorbed into the PEM. The protons migrate through the PEM and recombine with return hydrogen electrons on a cathode electrode on the oxygen side of the PEM and the oxygen to form water.

Claims

1. A fuel cell comprising:

(a) a semiconductor substrate having;

(i) at least one ion exchange membrane positioned substantially perpendicular to the substrate separating a source of oxygen from a source of hydrogen,

(ii) an outlet path for removing water formed as a product of reaction between the oxygen and the hydrogen,

(iii) a first electrode on a first side of the membrane and a second electrode on a second side of the membrane;

(iv) a catalyst in electrical communication with said membrane sides and electrodes;

(b) a cover made from a gas impermeable material which forms a seal with the membrane; and

(c) a load coupled to said electrodes to enable extraction of power generated by said reaction.

2. The fuel cell of claim 1 wherein the catalyst is incorporated in the first and second electrodes.

3. The fuel cell of claim 1 wherein the membrane is formed of a polymer.

4. The fuel cell of claim 1 wherein the electrodes are formed of an electrically conductive polymer.

5. A fuel cell comprising:

(a) a substrate;

(b) first and second flow paths in the substrate for admitting fuel into the first flow path and oxidant into the second flow path;

(c) a membrane positioned substantially perpendicular to the substrate enclosing an area and having a first and second side separating the inside flow path from the outside flow path;

(d) a first electrode on the first side of the membrane and a second electrode on the second side of the membrane;

(e) a catalyst in electrical communication with the membrane sides and the electrodes; and

(f) a cover made from a gas impermeable material which forms a seal with the membrane.

6. The fuel cell of claim 5 wherein the catalyst is incorporated in the first and second membrane sides.

7. The fuel cell of claim 5 wherein the catalyst is incorporated within the electrodes.

8. The fuel cell of claim 5 wherein the electrodes are formed of an electrically conductive polymer.

9. The cell of claim 5 in which the membrane is a proton exchange membrane.

10. The fuel cell of claim 5 in which the membrane is formed of a polymer.

11. The fuel cell of claim 10 in which the polymer is built in layers.

12. The fuel cell of claim 5 wherein the membrane is cast.

13. The fuel cell of claim 12 wherein the membrane is etched to create the first and second sides.

14. The fuel cell of claim 12 wherein the membrane is cast using a spin coating process.

15. The fuel cell of claim 5 wherein the membrane is corrugated to increase surface area.

16. The fuel cell of claim 5 wherein the substrate has holes through which fuel or oxidant or a reaction product flows substantially perpendicular to the plane of the substrate.

17. The fuel cell of claim 16 wherein the holes supply fuel or oxidant to the inside or outside of fuel cell.

18. The fuel cell of claim 5 wherein electrically conductive material crosses under the membrane for interconnection to the electrodes.

19. A power chip comprising:

(a) a monolithic substrate;

(b) an array of fuel cells comprising;

(i) a plurality of first and second flow paths in the substrate for admitting fuel into the first flow path and oxidant into the second flow path;

(ii) a plurality of membranes positioned substantially perpendicular to the substrate having first and second sides separating the first flow path from the second flow path;

(iii) a first electrode on the first side of each of the membranes and a second electrode on the second side of each of the membranes;

(iv) a catalyst in electrical communication with the first and second membrane sides and the electrodes;

(v) a cover made from a gas impermeable material which forms a seal with the membranes of said array;

(c) fuel cells of said array being electrically interconnected to form a power chip;

(d) a plurality of manifolds enclosing said array to distribute fuel and oxidant to the power cells; and

(e) at least one power terminal coupled to the fuel cells,

(iv) a catalyst in electrical communication with the first and second membrane sides and the electrodes;

(v) a cover made from a gas impermeable material which forms a seal with the membranes of said array;

(c) fuel cells of said array being electrically interconnected to form a power chip;

(d) a plurality of manifolds enclosing said array to distribute fuel and oxidant to the power cells; and

(e) a plurality of power terminals.

20. The power chip of claim 19 wherein the substrate is formed of an insulator.

21. The power chip of claim 20 wherein the insulator is taken from the group of sapphire, glass, phenolic material.

22. The power chip of claim 19 wherein the substrate is formed of semiconductor material.

23. The power chip of claim 22 wherein the semiconductor is taken from the group comprising Si, Ga, or GaAs.

24. The power chip of claim 19 wherein lids of fuel cells in said array are integrated with the manifold.

25. The power chip of claim 19 wherein a plurality of fuel cells are electrically interconnected via switches, fuses and metal links, in a configurable manner.

26. The power chip of claim 25 wherein the switches are semiconductor transistors integrated on to the substrate.

27. The power chip of claim 25 wherein the configuration is one time programmable.

28. The power chip of claim 25 wherein the configuration is under control of a microcontroller.

29. The power chip of claim 25 wherein the switches under control provide for dynamic active area control to optimize fuel consumption and operating efficiencies.

30. The power chip of claim 19 wherein one or more microcontrollers monitor performance parameters including power output, temperature and fuel consumption.

31. The power chip of claim 19 wherein one or more microcontrollers are integrated on to the substrate.

32. The power chip of claim 19 further comprising a plurality of integrated sensors for sensing temperature, voltage, current and gas pressure and flow.

33. The power chip of claim 19 wherein the chip supports internal and external communications interface.

34. The power chip of claim 33 wherein the communications interface uses the power terminals.

35. The power chip of claim 19 wherein:

power output is programmable.

36. The power chip of claim 19 wherein power output can be AC or DC.

37. A power disk comprising:

(a) a planar substrate;

(b) at least one power chip comprising;

(i) a plurality of flow paths in the substrate for admitting fuel and oxidant;

(ii) the array of fuel cells;

of claim 19 and

(iii) a plurality of power terminals coupled to the fuel cells;

(c) at least one manifold enclosing said array to distribute fuel and oxidant to the power chips; and

(d) at least one power bus terminal coupled to the at least one power chip.

38. A power stack comprising:

(a) the plurality of power disks arranged adjacent with respect to each other;

(b) electrical interconnect between said of claim 37; and

(c) a manifold to supply fuel and oxidant to the power disks.

39. A power stack of claim 38 wherein the flow paths between the power disks are self coupling.

40. A power stack of claim 38 wherein a power bus between the power disks are self coupling.

41. A fuel cell comprising:

(a) a monolithic substrate having;

(i) at least one membrane positioned substantially perpendicular to the substrate physically separating a source of oxidant from a source of fuel while enabling a reaction to occur between the oxidant and the fuel;

(ii) a first electrode on a first side of the membrane and a second electrode on a second side of the membrane;

(iii) an outlet path for removing water formed as a product of said reaction between the oxidant and the fuel,

(b) a cover made from a gas impermeable material which forms a seal with the membrane.

42. The fuel cell of claim 41 further comprising a catalyst in electrical communication with said membrane sides and electrodes.

43. The fuel cell of claim 42 wherein the catalyst is incorporated within the electrodes.

44. The fuel of claim 41 wherein the membrane is an ion exchange membrane.

45. The fuel cell of claim 41 wherein the membrane is formed of a polymer.

46. The fuel cell of claim 41 wherein the electrodes are formed of an electrically conductive polymer.

47. The fuel cell of claim 41 wherein a load is coupled to said electrodes to enable extraction of power generated by said reaction.

48. A fuel cell comprising:

(a) three flow channels, an inner channel and two outer channels, in a substrate wherein each outer channel is separated from the inner channel by a wall having a plurality of vertical slits;

(b) an electrode on a base of an outer side of each wall;

(c) a catalyst plurality of tines formed between the slits, and wherein said catalyst contacts said electrodes;

(d) at least one membrane positioned substantially perpendicular to the substrate and disposed in the inner channel; and

(e) a lid made from a gas impermeable material which forms a seal with the substrate.