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Membrane electrode for proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in battery electrodes, fuel cell parts, circuits, etc., can solve the problems of catalyst waste, ineffective utilization, complex process, etc., to reduce costs, reduce load capacity, enhance The effect of battery performance

Inactive Publication Date: 2010-02-10
江苏新源动力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the process is complicated, the amount of catalyst is large, and the large-area catalyst structure will inevitably cause part of the catalyst to be wasted on the membrane, which cannot be effectively used, and the waste of precious metal catalysts during the transfer process is serious.

Method used

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  • Membrane electrode for proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare a strip-shaped flow field mold, make the strip-shaped hollow part of the mold correspond to the gas channel part of the flow field, and align and fix the mold with the proton exchange membrane. 5% Nation solution and 20% Pt / C are ultrasonically oscillated in a mass ratio of 1:3, and mixed evenly, and then deionized water and glycerin are added to it, and after being evenly mixed by ultrasonic waves, a small amount of 5% NaOH solution to form an ink-like solution, spray the above solution directly onto the Na-type PEM, and dry it at 160-190°C; use the same method to spray the ink-like solution on the other side of the PEM, and dry it to form a thin layer CCM; make the CCM in 0.5mol / L H 2 SO 4 Boiling for 1 hour, the sodium-type PEM is transformed into hydrogen-type PEM, then washed with deionized water, and dried. A strip-shaped catalyst layer is formed on the proton exchange membrane.

Embodiment 2

[0026] Prepare a strip-shaped flow field mold, make the strip-shaped hollow part of the mold correspond to the gas channel part of the flow field, and align and fix the mold with the proton exchange membrane. Use a primary balance to weigh 20 mg of catalyst Pt and 20 mg of IrO2, add 1.6 g of 5% Nation solution, and oscillate ultrasonically for 40 minutes to mix evenly, then add deionized water and glycerin to it, and after ultrasonically mix evenly, add a small amount of 5 % NaOH solution to form an ink-like solution. Spray the above solution directly onto the Na-type PEM and dry it at 160-190°C; use the same method to spray the ink-like solution on the other side of the PEM and dry it to form a thin film. layer CCM; make the CCM in 0.5mol / L H 2 SO 4 Boiling for 1 hour, the sodium-type PEM is transformed into hydrogen-type PEM, then washed with deionized water, and dried. A strip-shaped catalyst layer is formed on the proton exchange membrane.

Embodiment 3

[0028] A layer of Pt with a thickness of 500nm is deposited on the entire surface of the film by plasma sputtering method. Then prepare the strip-shaped flow field mold, make the strip-shaped hollow part of the mold correspond to the gas channel part of the flow field, and align and fix the mold with the proton exchange membrane. Then use the plasma sputtering method to deposit a layer of Pt with a thickness of 500nm on the surface of the film, then impregnate the Nation / C / isopropanol solution on the surface of the Pt, and then sputter the Pt after drying. The thickness of the catalytic layer corresponding to the channel is 3-6 μm, and the loading of Pt is 0.043 mg / cm 2 , while the corresponding catalyst loading on the membrane at the raised part of the flow field is 25% of that at other parts.

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Abstract

The invention discloses a membrane electrode for a proton exchange membrane fuel cell (PEMFC), composed of catalyst layers coated on both sides of a proton exchange membrane. The membrane electrode ischaracterized in that in different areas of the catalyst layers coated on both sides of the proton exchange membrane corresponding to a flow field, the load amounts of catalyst of the catalyst layersare different, wherein the catalyst layer loads normal amount of the catalyst in the area of the proton exchange membrane corresponding to the groove of the flow field, namely in the area of the proton exchange membrane corresponding to the reaction airflow channel of the flow field, but the catalyst layer loads 0-80% of normal amount of the catalyst in the area of the proton exchange membrane corresponding to the protruding part of the flow field. The invention has the advantages of greatly saving the usage of noble metal catalysts, lowering the cost of cells, and being favorable for wettingthe membrane and maintaining uniformity and stability of CCM.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to membrane electrodes (Catalyst Coated Membrance, CCM) of proton exchange membrane fuel cells. Background technique [0002] The membrane electrode in the proton exchange membrane fuel cell is the core component of the proton exchange membrane fuel cell, and the membrane electrode is mainly composed of the proton exchange membrane, the catalytic layer and the diffusion layer. The currently used membrane electrodes mainly include five-in-one membrane electrodes and three-in-one membrane electrodes (CCM). In the electrodes, the catalytic layer is generally located between the diffusion layer and the proton exchange membrane. The catalytic layer is composed of electrocatalysts (such as Pt / C, Pt, Pd or their composites, etc.) and solid polymer electrolytes (such as Nafion, etc.). The diffusion layer is generally a hydrophobic treated carbon paper or carbon ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M4/90H01M4/92H01M4/88
CPCY02E60/50
Inventor 付宇潘欢欢吴洪亮孙佰文
Owner 江苏新源动力有限公司
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