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Composite catalytic layer proton exchange membrane fuel cell electrode and its preparing method

A fuel cell electrode, proton exchange membrane technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of "water-flooded" hydrophobic electrode catalyst utilization, high electrocatalyst utilization, large proton conduction resistance, etc. Good electron conduction and proton conduction, good gas conduction and water transport, the effect of improving output power density

Active Publication Date: 2006-03-08
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a high gas conductivity, electrochemical three-phase Gas diffusion electrode with large reaction interface area, high utilization rate of electrocatalyst, capable of obtaining high output power density and manufacturing method thereof

Method used

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  • Composite catalytic layer proton exchange membrane fuel cell electrode and its preparing method
  • Composite catalytic layer proton exchange membrane fuel cell electrode and its preparing method
  • Composite catalytic layer proton exchange membrane fuel cell electrode and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a) According to 0.25mgPt / cm 2 The amount of catalyst used is to weigh the Pt / C catalyst with a Pt loading of 40wt% and put it into a beaker, add a small amount of deionized water to soak the catalyst, and use 50ml of absolute ethanol per gram of catalyst. After weighing, add the ethanol After the catalyst beaker, mix and stir evenly, and the material is slurry. Then according to the ratio of Pt / C: PTFE = 1: 1.5, weigh PTFE and add it to the feed liquid, mix evenly, and mature.

[0043] Scrape-coat the above-mentioned cured slurry on one side of the gas diffusion layer leveling layer that has been hydrophobized and leveled on one side, dry at 160°C for 30 minutes under the protection of nitrogen, and then heat up to 250°C and bake for 30 minutes, then raise the temperature To 360°C, bake for 30 minutes. After cooling, weigh 5wt% Nafion solution in an amount of 1 mg polymer electrolyte per square centimeter; add appropriate isopropanol, mix evenly, and spray evenly on t...

Embodiment 2

[0050] a) The hydrophobic catalyst slurry was prepared according to the method in a) of Example 1, and the hydrophobic catalytic layer was prepared on the gas diffusion layer according to the method of Example 1, and the hydrophobic catalytic layer was three-dimensionalized.

[0051] b) prepare hydrophilic catalytic layer slurry by b) method of embodiment 1, this slurry is sprayed onto the surface of PTFE membrane equably, the usage amount of hydrophilic catalytic layer Pt is by 0.25mg / cm 2 adjust. After drying, put two pieces of hydrophilic catalytic layer prepared on PTFE membrane on both sides of a pre-treated Nafion 112 membrane, heat press to transfer the hydrophilic catalytic layer to both sides of the proton exchange membrane, and then place the two The three-dimensionally treated hydrophobic electrodes are respectively placed on the above-mentioned hydrophilic catalytic layer, and hot-pressed to obtain a three-in-one membrane electrode.

Embodiment 3

[0053] The electrode manufactured in Example 1 was used as a cathode, and the electrode manufactured in Comparative Example was used as an anode, which were hot-pressed with Nafion 1035 membrane to obtain a three-in-one membrane electrode.

[0054] The three-in-one membrane electrodes prepared in the above-mentioned Example 1, Example 2, Example 3 and Comparative Example were respectively assembled into single cells and evaluated on a fuel cell evaluation system. Its evaluation results, such as image 3 , Figure 4 , Figure 5 shown in the curve. The specific operating parameters of the fuel cell are as follows. The working temperature of the fuel cell is 80°C, the temperature of the humidifier is 78-80°C, the working pressure of the fuel cell is 0.2MPa, and the hydrogen and air volumes are strictly controlled. The hydrogen stoichiometric ratio is 1.17 and the air stoichiometric ratio is 2.5.

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Abstract

Catalysis layer including more than one layer of containing hydrophobicity material (such as PTFE) and catalysis of platinum carried by carbon (Pt / C) is prepared on surface at side of leveling layer of gas diffusion layer. The leveling layer is processed by hydrophobicity and carbon powder in advance. After being baked under protection of inert gases at 320-380 deg.C, the catalysis layer is spray coated by solid polyelectrolyte in certain quantity. Then, more than one layer of slurry composed of solid polyelectrolyte, electrode catalyst and solvent in specific proportion is prepared on the catalysis layer. After being baked under protection of inert gases at 100-380 deg.C, electrode of fuel cell composed of composite catalysis layers in different hydrophobicity and hydrophilicity is obtained. Advantages are: satisfied conduction of protons and electrons, better transmission or diffusivity of gases and water, expanded reaction interface, and raised power density.

Description

Field of invention: [0001] The invention relates to a solid polymer proton exchange membrane fuel cell electrode and a manufacturing method thereof, in particular to a composite electrode catalytic layer having two or more layers with different affinity and hydrophobicity, capable of obtaining a high output power density composite catalyst Layer-structured gas diffusion electrode and method for producing the same. technical background: [0002] A fuel cell is a power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy. The fuel cell has the advantages of high power generation efficiency, environmental friendliness, and energy diversification. Fuel cells can be divided into proton exchange membrane fuel cells (PEMFC), alkaline fuel cells (AFC), phosphoric acid fuel cells (PAFC), solid oxide fuel cells (MCFC), etc. according to different electrolytes. Proton exchange membrane fuel cell with gas as fuel and air as oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 张华民董明全邱艳玲衣宝廉王晓丽王晓燕
Owner SUNRISE POWER CO LTD
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