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Modified carbon products, their use in proton exchange membranes and similar devices and methods relating to the same

a technology of proton exchange membrane and modified carbon, which is applied in the direction of catalyst activation/preparation, final product manufacturing, metal/metal-oxide/metal-hydroxide catalyst, etc., can solve the problem of requiring a humid fuel to operate efficiently, and achieve the effect of reducing proton conductivity and increasing mechanical strength

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

AI Technical Summary

Benefits of technology

[0017] According to one aspect of the present invention, a proton conducting membrane including a modified carbon product and a polymer is provided. In one embodiment of the present aspect, the modified carbon product is a modified carbon black. In another embodiment of the present aspect, the modified carbon product is a modified carbon fiber. In yet another embodiment, the modified carbon product includes a proton conducting functional group. In one embodiment, the proton conducting functional group is selected from the group of SO3H, CO2H, PO3H2 and PO3 MH, where M is a monovalent cation. In another embodiment, the proton conducting functional group is selected from the group of carboxylic acids, sulfonic acids, phosphonic acids and phosphonic acid salts. In one embodiment, the polymer is selected from the group of a sulfonated PTFE and a perfluorosulfonated PTFE. In another embodiment, the polymer is selected from the group of polyvinylidene fluoride (PVDF), acid-doped or derivatized hydrocarbon polymers, such as polybenzimidizole (PBI), polyarylenes, polyetherketones, polysulfones, phos

Problems solved by technology

One drawback to current PEMs is that they require a humid fuel to operate efficiently due to the intermittent spacing of the proton exchange materials within the membrane.

Method used

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  • Modified carbon products, their use in proton exchange membranes and similar devices and methods relating to the same
  • Modified carbon products, their use in proton exchange membranes and similar devices and methods relating to the same
  • Modified carbon products, their use in proton exchange membranes and similar devices and methods relating to the same

Examples

Experimental program
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examples

Proton Exchange Membrane Examples

A. Production of PEG-VULCAN XC-72-Reinforced PFSA PEM

[0228] 90 mL of deionized water, 26.5 g of a treating agent (aminophenylated polyethylene glycol ether, MW˜2119 and having the formula (H2N—C6H4—CO—[O—(C2H4O)n—CH3])) and 2.25 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., 10 g of VULCAN XC-72 carbon black is added and the mixture is stirred and heated to 50° C. When the temperature reaches 50° C., 4.3 g of a 20 wt. % aqueous sodium nitrite solution is added slowly drop wise. The mixture is then allowed to react at 50° C. for 2 hours. When the reaction is substantially complete, the sample is diafiltered using 10 volumes of fresh deionized water to remove any reaction by-products. The resulting PEG-modified VULCAN XC-72 carbon is added to a PFSA water / isopropanol solution to give a modified carbon solids loading ...

example b-1

To Cast a 70 wt. % SO3H Modified Carbon Black / PFSA Membrane

[0229] To 70 g of (C6H4)SO3H modified VULCAN XC-72 (3 μmols / m2) is added 2000 g of a 5 wt. % PFSA isopropanol / water solution to give a 70 wt % modified carbon black / PFSA suspension. The resulting viscous suspension is mixed for several minutes and poured onto a Teflonized glass plate. The resulting film is doctor bladed to a thickness (wet) of 5 mils. The resulting film is dried in air at room temperature for 24 hours.

example b-2

To Cast a 15 wt. % SO3H Modified Carbon Black / PFSA Membrane

[0230] To 15 g of (C6H4)SO3H modified VULCAN XC-72 (3 μmols / m2) is added 2000 g of a 5 wt. % PFSA isopropanol / water solution to give a 15 wt % modified carbon black / PFSA suspension. The resulting suspension is mixed for several minutes and poured onto a Teflonized glass plate. The resulting film is doctor bladed to a thickness (wet) of 20 mils. The resulting film is dried in air at room temperature for 24 hours. The resulting membrane has increased mechanical stability and higher proton conductivity at lower humidification levels.

C. Direct Printed Modified Carbon Product / PFSA PEM

[0231] A modified carbon suspension containing modified carbon black includes from about 2 to 10 wt. % solids loading of the carbon black, a humectant, viscosity, surface tension modifier and / or a biocide. CAB-O-JET 200 (Cabot Corporation, Boston, Mass.) is a dispersion of 20 wt. % BLACKPEARLS 700, modified with (C6H4)SO3H, in water. The dispersi...

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Abstract

Proton exchange membranes incorporating modified carbon products. The modified carbon products advantageously enhance the properties of proton exchange membranes, leading to more efficiency within a fuel cell or similar device.

Description

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 SAME”, filed on Mar. 15, 2005, and further ide...

Claims

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Application Information

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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, PAOLINANAPOLITANO, PAULBHATIA, RIMPLERICE, GORDON L.CARUSO, JAMESGURAU, BOGDAN
Owner CABOT CORP
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