Fuel cell membrane electrode using polymer superbhort fiber as hydrophobic agent and its preparing method

A fuel cell membrane and fuel cell technology, applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., can solve the problems of reducing the three-phase reaction interface of the catalyst layer, increasing the resistance of the membrane electrode, reducing the life of the membrane electrode, etc.

Inactive Publication Date: 2007-11-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Na treatment of Nafion can increase its treatment temperature, but it will make the nano-Pt in the Pt/C catalyst grow up, and the proton exchange membrane needs to be protonized after MEA preparation, which makes the membrane electrode synthesis process complicated
2) PTFE often wraps Pt/C electrocatalyst particles in the form of spherical particles during the blending and precipitation process with catalyst particles. Since PTFE is a non-conductor, the conductor performance of the cat

Method used

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  • Fuel cell membrane electrode using polymer superbhort fiber as hydrophobic agent and its preparing method
  • Fuel cell membrane electrode using polymer superbhort fiber as hydrophobic agent and its preparing method
  • Fuel cell membrane electrode using polymer superbhort fiber as hydrophobic agent and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of Fuel Cell Membrane Electrode with PTFE Ultrashort Fiber as Hydrophobic Agent

[0037] The preparation steps are:

[0038] 1) Disperse 3 grams of Pt / C (40wt%) catalyst in 10 grams of deionized water, add 20 grams of 5wt% perfluorosulfonic acid tree finger (Nafion ®, produced by U.S. Du Pont Company) solution, use under vacuum condition Disperse with a high-speed mixer (10,000 rpm) for 50 minutes to prepare a catalyst-electrolyte dispersion;

[0039] 2) 0.3 gram of PTFE ultra-short fiber is added to 3 grams of deionized water, 30 mg of sodium polyphosphate dispersant is added, and a high-speed mixer is used to disperse (10,000 rpm) for 30 minutes to obtain a PTFE ultra-short fiber dispersion, super The diameter of short fibers is 0.05-0.1 microns, and the fiber length is 25-50 microns;

[0040] 3) adding the prepared PTFE ultra-short fiber dispersion into the catalyst-electrolyte dispersion, and dispersing (10,000 rpm) in a high-speed mixer under vacuum f...

Embodiment 2

[0046] Preparation of Fuel Cell Membrane Electrode with PP Ultrashort Fiber as Hydrophobic Agent

[0047] The preparation steps are:

[0048] 1) Disperse 3 grams of Pt / C (40wt%) catalyst in 40 grams of isopropanol, add 30 grams of 5wt% perfluorosulfonic acid resin solution (Nafion ®, produced by U.S. Du Pont Company), and use Disperse with a high-speed mixer (10,000 rpm) for 55 minutes to obtain a catalyst-electrolyte dispersion;

[0049] 2) Add 0.15 g of PP ultra-short fibers to 7.5 g of isopropanol, add 45 mg of sodium polyacrylate dispersant and disperse with a high-speed mixer (10,000 rpm) for 30 minutes to obtain a polymer ultra-short fiber dispersion, The diameter of the ultra-short fiber is 0.1-1 micron, and the fiber length is 100-500 micron;

[0050] 3) Add the prepared PP ultra-short fiber dispersion to the catalyst-electrolyte dispersion, and disperse it with a high-speed mixer (10,000 rpm) for 30 minutes under vacuum conditions to prepare a catalyst slurry;

[0...

Embodiment 3

[0056] Preparation of Fuel Cell Membrane Electrode Using PET Ultrashort Fiber as Hydrophobic Agent

[0057] The preparation steps are:

[0058] 1), the preparation of the catalyst-electrolyte dispersion is the same as in Example 1, except that the solvent is an aqueous alcohol solution, the mass ratio of alcohol to water is 1:100, and the catalyst is PtCr / C (Pt:Cr=1:1);

[0059] 2), 0.3 grams of PET ultra-short fibers were added to 15 grams of deionized water, 90 mg of 30% sodium polyphosphate + 70% sodium polyacrylate compound was added, and a high-speed mixer was used to disperse (10,000 rpm) for 40 minutes. A polymer ultra-short fiber dispersion is prepared; the diameter of the ultra-short fiber is 0.01-0.05 microns, and the fiber length is 1-26 microns;

[0060] 3), adding the prepared PET ultra-short fiber dispersion into the catalyst-electrolyte dispersion, and dispersing (10,000 rpm) in a high-speed mixer under vacuum for 30 minutes to prepare a catalyst slurry;

[00...

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Abstract

A fuel cell membrane electrode using polymer ultra-short fiber as water repellent and it's the preparation method, in which the catalyst layer is dopped with polymer ultra-short fiber. The preparation method is that: coat the catalyst pulp containing load-type catalyst, solid polymer electrolyte, polymer ultra short fiber and the solvent on to gas diffusion layer surface to get a gas diffusion layer electrode, hot press this electrode and the proton exchange membrane to prepare the membrane electrode; Or transfer solidified catalyst onto two sides of the proton exchange membrane to prepare the catalyst /membrane central assembly. Advantages : raised water discharge function comparing with grain-like polymer water repellent, having good reaction gas dispersion path, raised structure and catalyst size stability and simple preparation process of membrane electrode.

Description

technical field [0001] The invention relates to a membrane electrode for a proton exchange membrane fuel cell and a preparation method thereof, in particular to a membrane electrode for a proton exchange membrane fuel cell containing ultra-short polymer fibers in a catalyst layer and a preparation method thereof, and to prepare a catalyst layer for the membrane electrode It has good gas channels, and the mechanical strength and dimensional stability are enhanced. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy by electrochemical means, and is considered to be the preferred clean and efficient power generation technology in the 21st century. This is because the fuel cell is not limited by the Carnot cycle and has high energy conversion efficiency. And since it is H 2 and O 2 The chemical reaction, the product of which is water, realizes zero discharge in the true sen...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/1004
CPCY02E60/50
Inventor 木士春田明星潘牧
Owner WUHAN UNIV OF TECH
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