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Carbon and carbon composites with highly ordered mesosize pores

By incorporating silica into the carbon electrode and using carbonizable polymer and copolymer assembly technology, ordered mesoporous carbon-silica composites were prepared, which solved the problem of oxidation instability of the carbon carrier and improved fuel cells. long-term stability and catalyst performance.

Inactive Publication Date: 2009-12-23
GM GLOBAL TECHNOLOGY OPERATIONS LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a significant issue preventing the large-scale implementation of PEM fuel cell technology is the performance loss during long-term operation and vehicle cycle duty
Recent studies of battery performance degradation have revealed that a substantial portion of the performance loss is due to degradation of the electrocatalyst

Method used

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Examples

Experimental program
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Embodiment Construction

[0018] DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] The present invention produces carbon particles whose pore diameter (according to the opening pore diameter) is uniformly in the mesopore size range of 2 to 50 nanometers. Smaller pore sizes less than about 2 nanometers are referred to as micropores. Such pore sizes are generally too small for fuel cell catalyst support applications. Larger pore sizes greater than about 50 nanometers are referred to as micropores. Large pore size support particles are generally too large for fuel cell catalyst use.

[0020] According to the present invention, a suitable surfactant is homogeneously dispersed in a liquid medium (such as water) in the form of micelles and used to form a well-dispersed relatively low molecular weight carbonizable polymer and a silicate (such as ethyl orthosilicate). mixture. In a sense, the hydrophilic polymer and silica species can co-assemble with the surfactant-containing hydrogen-bonded PEO because th...

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PUM

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Abstract

Mesoporous carbon and silica containing composites are prepared based on the co-assembly of a suitable surfactant in a liquid medium. When a low molecular weight carbonizable polymer and a silica precursor are added to the surfactant solution, a mixture of distinct phases of the materials is formed after solvent evaporation. A polymer / silica solid composite with highly organized mesopores is obtained after surfactant removal. This product has utility as a catalyst support or gas absorbent. And the polymer-silica composite can be easily converted successively to a mesoporous carbon-silica composite and to a bimodal mesoporous carbon material.

Description

technical field [0001] The present invention relates to new porous forms of carbon and carbon composite materials and to methods of making such materials. These new carbon materials, some of which contain silica, have highly ordered mesopores, and this material can be used as catalyst support and getter material. Background of the invention [0002] Proton exchange membrane (PEM) fuel cells use electrocatalysts to oxidize hydrogen at the anode and reduce oxygen in the air at the cathode. Currently, platinum (Pt) supported on high surface area carbon is the preferred electrocatalyst for PEM fuel cell systems. However, a significant problem preventing the large-scale implementation of PEM fuel cell technology is the loss of performance during long-term operation and vehicle cycling. Recent studies of battery performance degradation have revealed that a substantial portion of the performance loss is due to degradation of the electrocatalyst. Carbon is considered a good catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
CPCC01B37/02C01B31/00C01B32/00Y02E60/50
Owner GM GLOBAL TECHNOLOGY OPERATIONS LLC