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Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same

a technology of carbon products and fluids, applied in the direction of physical/chemical process catalysts, non-metal conductors, sustainable manufacturing/processing, etc., can solve the problems of reduced electrical performance and reduced porosity in the gas/fluid diffusion layer

Inactive Publication Date: 2005-10-20
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a fuel cell with a gas / fluid diffusion layer that includes a modified carbon product, such as carbon black or graphite fibers, with different hydrophilic or hydrophobic properties. The gas / fluid diffusion layer can be fabricated using various methods such as ink-jet, spraying, or printing. The technical effect of this invention is to improve the performance and efficiency of fuel cells by optimizing the gas / fluid diffusion layer for better gas diffusion and water management.

Problems solved by technology

However, the use of such materials often results in decreased electrical performance and decreased porosity in the gas / fluid diffusion layer.

Method used

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  • Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same
  • Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same
  • Modified carbon products, their use in fluid/gas diffusion layers and similar devices and methods relating to the same

Examples

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examples

1. Printed SO3H and CF3 Terminated VULCAN XC-72 Microporous Layer

[0240] A solution containing ArNH2, NaNO2 and HCL (where Ar is —C6H6—SO3H), is added to a solution containing unmodified VULCAN XC-72 to form the diazonium salt, ArN≡N:+Cl− which in turn reacts with the surface of the VULCAN XC-72 to form the modified carbon black (MCB) product. The quantity of diazonium salt formed is sufficient to only give a partial surface coverage, 0.4 μmol / m2. The resulting MCB is isolated and redispersed in deionized water. To this solution additional ArNH2, NaNO2 and HCI are added. However, in this case Ar is —C6H6—CF3. The resulting reactions yield a MCB product containing 0.4 μmol / m2 SO3 groups and 0.2 umol / m2 CF3 groups, approximate total loading of MCBs is 0.6 μmol / m2. The resulting MCB is then dispersed in a low viscosity ink, i.e., dispersed in deionized water and is sprayed onto the surface of a carbon cloth GDL to form the microporous layer. The resulting mix of hydrophobic / hydrophili...

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Abstract

Gas / Fluid diffusion layers incorporating modified carbon products. The modified carbon products advantageously enhance the properties of gas / fluid diffusion layers, leading to more efficiency within a fuel cell or similar device incorporating the gas / fluid diffusion layer.

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 Serial No. ______, entitled “MODIFIED CARBON PRODUCTS, THEIR USE IN BIPOLAR PLATES AND SIMILAR DEVICES AND METHODS RELATING TO THE SAME”, filed on Mar. 15,...

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
CPCB01J21/18Y02E60/523B01J23/462B01J23/8926B01J37/0207B01J37/084C08J5/22H01B1/122H01M4/86H01M4/8636H01M4/8652H01M4/8817H01M4/886H01M4/90H01M4/9083H01M4/921H01M4/926H01M8/0213H01M8/0234H01M8/0245H01M8/0291H01M8/1004H01M8/1011H01M8/1023H01M8/1025H01M8/1027H01M8/103H01M8/1032H01M8/1034H01M8/1039H01M8/1048H01M8/1081H01M2300/0094B01J23/42H01M8/0289Y02E60/50Y02P70/50H01M8/10
Inventor HAMPDEN-SMITH, MARK J.ATANASSOVA, PAOLINARICE, GORDON L.CARUSO, JAMESBREWSTER, JAMESBHATIA, RIMPLANAPOLITANO, PAULGURAU, BOGDAN
Owner CABOT CORP
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