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Modified carbon products, their use in bipolar plates and similar devices and methods relating to same

a technology of bipolar plates and carbon products, which is applied in the field of bipolar plates, can solve the problems of increasing the brittleness of bipolar plates and the performance of fuel cells, and achieve the effect of increasing the hydrophobicity of the first carbonaceous surfa

Inactive Publication Date: 2005-10-06
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a fuel stack with a bipolar plate that includes a modified carbon product with a hydrophilic or hydrophobic functional group. The bipolar plate can also have a gradient hydrophilic structure. The modified carbon product can be surface-modified using a diazonium salt or other surface-modifying groups. The invention also provides methods for increasing or decreasing the hydrophobicity of a carbon surface by covalently bonding a surface-modifying group. The technical effects of the invention include improved fuel cell performance and durability.

Problems solved by technology

Most resin compounds are not very conductive and tend to decrease the electrical conductivity of the bipolar plates, thereby resulting in decreased performance of the fuel cell.
Incorporation of such carbon materials can also increase the brittleness of the bipolar plate.

Method used

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  • Modified carbon products, their use in bipolar plates and similar devices and methods relating to same
  • Modified carbon products, their use in bipolar plates and similar devices and methods relating to same
  • Modified carbon products, their use in bipolar plates and similar devices and methods relating to same

Examples

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Effect test

examples

1. Surface Modification of a Machined Graphite Bipolar Plate with a Hydrophilic Modifying Group

[0177] 270 ml of deionized water, 6.48 g of a functionalizing (treating) agent (H2NC6H4SO3H) and 6.75 g of a 70% aqueous solution of nitric acid are added to a beaker and slowly mixed. The temperature is slowly raised to 40° C. using a hot plate. When the temperature reaches 40° C., a machined graphite bipolar plate is immersed into the solution and the solution is continually stirred and heated to 50° C. When the temperature reaches 50° C., 12.9 g of a 20 wt. % aqueous sodium nitrite solution is added slowly dropwise. The mixture is then allowed to react at 50° C. for 24 hours. The graphite plate is removed and washed with deionized water three times and dried at 50° C. overnight.

2. A Polymer / Resin Type Bipolar Plate Incorporating a Peg Modified Carbon

[0178] 90 ml of deionized water, 26.5 g treating agent (aminophenylated polyethylene glycol ether (MW 2119) (H2N—C6H4—CO—[O—(C2H4O)n—C...

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Abstract

Bipolar plates incorporating modified carbon products. The modified carbon products advantageously enhance the properties of the bipolar plates, leading to more efficiency within a fuel cell or a similar device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS AND CLAIM OF PRIORITY BENEFIT [0001] Pursuant to 35 U.S.C. § 119(e), this patent application claims a priority benefit to: (a) U.S. Provisional Patent Application No. 60 / 553,612 entitled “MODIFIED CARBON PRODUCTS AND THEIR USE IN GAS DIFFUSION LAYERS” filed Mar. 15, 2004; (b) U.S. Provisional Patent Application No. 60 / 553,413 entitled “MODIFIED CARBON PRODUCTS AND THEIR USE IN ELECTROCATALYSTS AND ELECTRODE LAYERS” filed Mar. 15, 2004; (c) U.S. Provisional Patent Application No. 60 / 553,672 entitled “MODIFIED CARBON PRODUCTS AND THEIR USE IN PROTON EXCHANGE MEMBRANES” filed Mar. 15, 2004; and (d) U.S. Provisional Patent Application No. 60 / 553,611 entitled “MODIFIED CARBON PRODUCTS AND THEIR USE IN BIPOLAR PLATES” filed Mar. 15, 2004. This application is also related to U.S. patent application Ser. No. ______, entitled “MODIFIED CARBON PRODUCTS, THEIR USE IN ELECTROCATALYSTS AND ELECTRODE LAYERS AND SIMILAR DEVICES AND METHODS RELATING TO THE SA...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J21/18B01J23/42B01J23/46B01J23/89B01J37/02B01J37/08C08J5/22H01B1/12H01M2/00H01M2/02H01M2/14H01M4/86H01M4/88H01M4/90H01M4/92H01M4/94H01M4/96H01M8/00H01M8/02H01M8/10
CPCB01J21/18B01J23/42B01J23/462B01J23/8926B01J37/0207B01J37/084C08J5/22H01B1/122H01M4/86H01M4/8636H01M4/8652H01M4/8817H01M4/886H01M4/90H01M4/9083H01M4/921H01M4/926H01M8/0213H01M8/0234H01M8/0245H01M8/1004H01M8/1011H01M8/1023H01M8/1025H01M8/1027H01M8/103H01M8/1032H01M8/1034H01M8/1039H01M8/1048H01M8/1081H01M2300/0094Y02E60/523Y02P70/56H01M8/0289Y02E60/50Y02P70/50H01M8/10
Inventor HAMPDEN-SMITH, MARK J.ATANASSOVA, PAOLINACARUSO, JAMESRICE, GORDON L.BHATIA, RIMPLENAPOLITANO, PAULGURAU, BOGDAN
Owner CABOT CORP
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