Thin film ink catalyst

A technology of catalysts and catalyst membranes, applied in catalyst activation/preparation, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc.

Inactive Publication Date: 2012-08-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional catalysts are still prone to agglomeration, dissolution and other durability issues due to being nanoparticles
The development of durable and active catalysts for proton exchange membrane fuel cell (PEMFC) applications remains a challenge

Method used

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  • Thin film ink catalyst
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054] Glass spherical particles with a diameter of 3 μm were coated with 4 atomic layers of Pt catalyst. The thickness of the catalyst layer was 20 micrometers. The dense packing limit for spheres is about 0.74 or 74%. It is to be noted that the dense packing limit is 74% and the void volume is 26% for the face centered cubic aligned spheres. Packing limits can vary with particle shape. In order to include other ingredients in the paint, the glass spheres constitute approximately 34% of the volume of the catalyst paint layer, with the remaining total volume filled with other ingredients such as porous carbon and ionomer. The calculated values ​​shown in Table 1 show an expected surface area increase of 13.6 cm 2 / cm 2 , while the Pt loading was much reduced to 3.3×10 -5 g / cm 2 or 0.033mg / cm 2 .

[0055] Table 1

[0056] Density of Glass Particles

example 2

[0058]Glass spherical particles with a diameter of 1 μm were coated with 4 atomic layers of Pt catalyst. The thickness of the catalyst coating layer was 20 micrometers. The dense packing limit for spheres is about 0.74 or 74%. In order to include other ingredients in the coating, the glass spheres constitute approximately 45% of the volume of the catalyst coating layer, with the remainder of the total catalyst volume filled with other ingredients such as porous carbon and ionomer. The calculated values ​​shown in Table 2 show a desired surface area increase of 54 cm 2 / cm 2 , while the Pt loading is much reduced to about 1.3×10 -4 g / cm 2 or 0.13mg / cm 2 .

[0059] Table 2

[0060] Density of Glass Particles

example 3

[0062] Spherical glass particles with a diameter of 75 microns were obtained from Sigma Aldrich. Using atomic layer deposition (ALD) techniques in Figure 4A with Figure 4B A Pt layer of approximately 33 nm was deposited on the surface of the sphere depicted in .

[0063] An example catalyst coating consists of 100 mg of Pt-coated glass spheres to which 100 mg of 20 wt% Ion Power Nafion solution and 400 mg of 99% Acrylic acid for dry loading of 17 wt% Nafion are added. Triols. Stir the paint at 180rpm in a glass bottle for 6 to 8 hours. Most of the Pt-coated glass beads settled to the bottom of the bottle. If the coating solution was left unstirred overnight, the dispersed beads settled (the prepared coating was not dense enough to support a stable suspension of Pt-coated glass beads). The coating solution was applied to ETEK LT2500-wGDL (353 μm) with a cotton-tipped applicator to cover the GDL surface. The coated GDL was dried at 80°C for 2 hours and vacuum dried at 80...

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Abstract

In one embodiment, a catalyst ink includes a number of catalytic particles each including a particle base which supports a 2-dimension (2D) extensive catalyst film, the 2D extensive catalyst film including at least one precious metal. The 2D extensive catalyst film may contact an exterior surface of the particle base. The 2D extensive catalyst film may contact an interior surface of the particle base. In another embodiment, the particle base has a base dimension that is 50 to 10,000 times greater than a thickness of the 2D extensive catalyst film. In certain instances, the particle base has a base dimension that is 100 to 5,000 times greater than a thickness of the 2D extensive catalyst film.

Description

[0001] This application claims the benefit of U.S. Provisional Application Serial No. 61 / 437,315, filed January 28, 2011, and claims priority to U.S. Application Serial No. 13 / 351,713, filed January 17, 2012, both of which The disclosure is hereby incorporated by reference in its entirety. technical field [0002] The invention relates to a thin film coating catalyst. Background technique [0003] Although reliability and operating life have been considered in order to utilize fuel cell (FC) technology in automotive applications, catalytic activity is still a factor that needs to be thoroughly considered in order to commercialize fuel cell technology, especially fuel cell vehicles. Efforts have been made to develop fuel cell catalysts with desirable electrocatalytic oxidation-reduction reactions (ORR). To this end, fuel cell catalysts have shown some improvements over pure platinum nanoparticles and / or pure platinum alloy nanoparticles supported on carbon. However, these t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J37/02B01J37/025B01J23/42B01J31/28H01M4/90H01M4/92
CPCH01M2008/1095H01M4/925Y02E60/50H01M4/92
Inventor 阿里瑞扎·佩支曼·施凡尼亚
Owner FORD GLOBAL TECH LLC
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