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Catalyst layers having thin film mesh catalyst (TFMC) and fuel cell electrode assembly

A fuel cell electrode, fuel cell technology, used in fuel cell parts, fuel cells, battery electrodes, etc.

Inactive Publication Date: 2010-02-24
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Development of active and long-lasting catalysts for proton exchange membrane fuel cell (PEMFC) applications can be challenging

Method used

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  • Catalyst layers having thin film mesh catalyst (TFMC) and fuel cell electrode assembly
  • Catalyst layers having thin film mesh catalyst (TFMC) and fuel cell electrode assembly
  • Catalyst layers having thin film mesh catalyst (TFMC) and fuel cell electrode assembly

Examples

Experimental program
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Effect test

example 1

[0092] Several mesh substrates were obtained made of copper and nickel, with platinum deposited on both sides of the substrates by means of sputtering. The thickness of the platinum deposit was controlled to provide a measure of catalyst loading. The nickel screen was provided with 750 lines per inch in the X and Y directions. A 0.00099" area of ​​mesh openings with 55% porosity has a wire diameter of 0.00034", or a 0.025146 square millimeter area of ​​mesh openings with 55% porosity has a diameter of 0.008636 millimeters. Deposit a 15 nm thick layer of platinum on the mesh using the sputtering technique. This is interpreted as per square centimeter (mg / cm 2 ) about 0.032 mg loading, which is much lower than that on commercially available MEA. TFMC thus prepared in Figure 4 is shown together with the GDL used in this example. Figure 4 Illustratively shown is a thin film catalyst with nickel base (TFMC) and 15 nm of platinum deposition with GDL.

[0093] Figure 6A to ...

example 2

[0098] Potential cycling prior to cyclic voltammetry (CV) was performed to test TFMC durability. The experiments were done in a 3-cell setup with 1 molar sulfuric acid. The CV was adjusted to sweep from -0.12V to 0.8V against a silver / silver chloride reference electrode. Potential cycling was processed as a square wave with an oscillating potential from 0.95V to 0.15V. Values ​​from the CV procedure before and after 1800 cycles are depicted in FIG. 5 . Figure 5 depicts ADT for conventional GDE (a) and TFMC (b).

[0099] As demonstrated in Figure 5, the CV for conventional GDE changed significantly after 1000 minutes of the cycle, while the CV for TFMC showed very little change before or after cycling. Compared with conventional GDE, the exposed area of ​​TFMC is very small, and as a result, the current in TFMC is relatively low.

[0100] Because it may be very expensive or impractical to have a single crystal of (111) on the entire surface of a mesh matrix carrier, an alte...

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Abstract

According to one or more embodiments, a fuel cell catalyst layer and a fuel cell electrode assembly are provided. In at least one embodiment, the fuel cell catalyst layer includes an interconnected network of first spaced apart strands extending longitudinally in a first direction and second spaced apart strands extending longitudinally in a second direction, the interconnected network defining anumber of openings bonded by an adjacent pair of the first spaced apart strands and an adjacent pair of the second space apart strands, and the number of openings forming a passage way; and a metalliccatalyst in overlaying contact with at least a portion of the first and second spaced apart strands in the interconnected network. The fuel cell electrode assembly includes a proton exchange membraneand a catalyst layer adjacent to the proton exchange membrane.

Description

[0001] This application asserts the benefit of U.S. Provisional Application No. 61 / 091,070, filed August 22, 2008, and claims priority to U.S. Application No. 12 / 495,839, filed July 1, 2009. technical field [0002] One or more embodiments of the invention relate to a catalyst layer and fuel cell electrode assembly having a thin film mesh catalyst (TFMC). Background technique [0003] Although reliability and operating life are often considerations for utilizing fuel cell (FC) technology in automotive applications, catalyst activity remains a factor that needs to be deeply considered for the eventual commercialization of FC vehicles. The development of active and durable catalysts for proton exchange membrane fuel cell (PEMFC) applications can be challenging. Here, a design is described to develop an active catalyst that ingeniously solves the problem with conventional platinum-on-carbon (Pt / C)-based catalyst layers by, for example, eliminating the catalyst layer and using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M8/02
CPCH01M4/921H01M4/8871Y02E60/50H01M2008/1095
Inventor 阿里瑞扎·佩支曼·施凡尼亚平野伸一
Owner FORD GLOBAL TECH LLC