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Substrate selection for catalyst

A catalyst and substrate technology, applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc.

Inactive Publication Date: 2013-08-21
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The development of highly active and durable catalysts for PEMFC applications remains a major challenge

Method used

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  • Substrate selection for catalyst
  • Substrate selection for catalyst
  • Substrate selection for catalyst

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Embodiment Construction

[0030] As required, detailed embodiments of the invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely illustrative of the invention which may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0031] It has been reported that bulk catalysts for oxygen reduction reaction (ORR) in proton exchange membrane fuel cell (PEMFC) cathodes are associated with high areal specific activity and higher durability. Desired catalyst-supported substrates should be able to obtain higher dispersion of catalytic sites to facilitate transport of water, gas, electrons, heat, and protons (from / to the c...

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Abstract

In one embodiment, a method of forming a catalyst / substrate construction includes: identifying a catalyst having a specific activity, determining a surface area factor for supporting the catalyst based on the specific activity of the catalyst; selecting a substrate having the surface area factor; and applying the substrate to the catalyst to form the catalyst / substrate construction. In certain instances, the surface area factor may be determined according to the following equation: SA support  ( cm support 2 / cm planar 2 ) = [ ''  Baseline ''  ( A  /  mg Pt ) Mass   Activity   I   F Loading   ( mg Pt  /  cm 2 ) ]  [ Specific   Activity   ( [mu]   A  /  cm 2 ) 0.000001  ( A  /  [mu]A ) ] wherein the term "Baseline" refers to mass activity of 100 A per gram of platinum (Pt) for a comparative catalyst 5 nm Pt nano-particles dispersed on a carbon black support, the term "Mass Activity IF" refers to the activity required to achieve a high current density performance target of 1.5 A / cm2 at 0.67 V, at a platinum loading of 0.1 mg Pt / cm2. In another embodiment, the method also comprises a target superficial area corresponding to a superficial area factor calculated according to the following equation, wherein [sigma] represents catalyst layer thickness, [rho] represents substrate block density, and [u] represents catalyst use ratio percentage.

Description

technical field [0001] One or more embodiments of the invention relate to substrate selection for catalysts. Background technique [0002] Reliability and operating life are important considerations in the process of commercializing fuel cell (FC) technology for automotive use. As important as catalyst durability is catalyst activity in making fuel cell vehicles commercially successful. The development of highly active and durable catalysts for PEMFC applications remains a major challenge. Contents of the invention [0003] In one embodiment, a method of forming a catalyst / substrate configuration includes: identifying a catalyst having a specific activity; determining a surface area factor for supporting a catalyst (especially a monolithic catalyst) based on the specific activity of the catalyst; selecting a catalyst having the specific activity. the substrate with the aforementioned surface area factors; and applying the substrate to the catalyst to form a catalyst / subs...

Claims

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Application Information

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IPC IPC(8): B01J37/00B01J32/00
CPCB01J32/00B01J37/00B01J21/18B01J23/42B01J35/393B01J35/33B01J35/61
Inventor 安吉丽雅·珀斯肯姆普詹姆士·瓦尔德克平野伸一
Owner FORD GLOBAL TECH LLC
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