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Method for preparing ultra-low platinum fuel cell membrane electrode based on graphene porous membrane

A fuel cell membrane and graphene technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of low catalyst utilization, reduced utilization of Pt nano-catalysts, increased proton transport resistance, etc., to overcome uneven distribution of catalysts Uniformity, good gas transmission characteristics, and short preparation cycle

Pending Publication Date: 2021-12-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This membrane electrode preparation method based on powder catalyst will produce the following disadvantages: (1) in the prepared slurry, the catalyst utilization rate is not high due to the stacking of catalyst particles; (2) it will cause the ion resin solution to be unevenly distributed on the catalyst Uniformity leads to a great increase in proton transport resistance; (3) alcohol solvents tend to cause uneven dispersion of catalyst particles when dispersing powder catalysts, which greatly increases electron transport resistance
At present, there are many methods for preparing graphene as a carrier material, mainly including arc discharge method, thermal annealing method, solvothermal method, and graphene oxide reduction method, but the graphene powder prepared by this method will reduce the utilization of Pt nanocatalysts. At the same time, the method of preparing membrane electrodes is consistent with the traditional method of preparing membrane electrodes, but there are still some shortcomings of the above-mentioned traditional method of preparing membrane electrodes, which makes the performance improvement of fuel cells not obvious; based on this, in order to build more in fuel cell membrane electrodes Gas transport, water transport channels, and reduce electron transport resistance and proton transport resistance in the reaction process, while improving the utilization of metal platinum catalysts, to achieve ultra-low platinum loading of fuel cells, proposed to construct a graphene-based Method for preparing ultra-low platinum fuel cell with porous membrane

Method used

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  • Method for preparing ultra-low platinum fuel cell membrane electrode based on graphene porous membrane
  • Method for preparing ultra-low platinum fuel cell membrane electrode based on graphene porous membrane
  • Method for preparing ultra-low platinum fuel cell membrane electrode based on graphene porous membrane

Examples

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Embodiment 1

[0032] Example 1 Preparation of Graphene Porous Membrane Preparation of Ultra-low Platinum Fuel Cell Membrane Electrode

[0033] (1) Cut the aluminum foil into a size of 9cm×8cm, weigh 305.36mg, clean the surface with absolute ethanol, adhere the cut aluminum foil to the top of the chamber of the plasma arc system, and place a 99.99% graphite rod in the chamber , the chamber is evacuated to a vacuum of 5Pa, and then a mixed gas of nitrogen and hydrogen is introduced to a vacuum of 19kPa, and the volume ratio of nitrogen to hydrogen is 1:5;

[0034] (2) Turn on the arc equipment and carry out arc stripping for 10s. The graphene material is deposited on the metal film to obtain a graphene porous film. Take out the sample and weigh 307.96 mg, and the thickness of the graphene porous film is about 5 μm;

[0035] (3) the graphene porous film obtained in step (2) is fixed in the chamber of the electron beam deposition system, and the chamber is evacuated so that the vacuum degree re...

Embodiment 2

[0039] Example 2 Preparation of Graphene Porous Membrane Preparation of Ultra-low Platinum Fuel Cell Membrane Electrode

[0040] (1) Cut the aluminum foil into a size of 8cm×8cm, clean the surface with absolute ethanol, adhere the cut aluminum foil to the top of the chamber of the plasma arc system, place a 99.99% graphite rod in the chamber, and vacuum the chamber Vacuum to a vacuum degree of 5Pa, and then feed a mixed gas of nitrogen and hydrogen to a vacuum degree of 20kPa, and the volume ratio of nitrogen to hydrogen is 1:10;

[0041] (2) Turn on the arc equipment and perform arc stripping for 15s, and the graphene material is deposited on the metal film to obtain a graphene porous film with a thickness of about 8 μm;

[0042] (3) the graphene porous film obtained in step (2) is fixed in the chamber of the electron beam deposition system, and the chamber is evacuated so that the vacuum degree reaches 4 × 10 -6 toor, the voltage is 10KV, and the current is 115mA. Platinum ...

Embodiment 3

[0046] Example 3 Preparation of Graphene Porous Membrane Preparation of Ultra-low Platinum Fuel Cell Membrane Electrode

[0047] (1) Cut the aluminum foil into a size of 8cm×8cm, clean the surface with absolute ethanol, adhere the cut aluminum foil to the top of the chamber of the plasma arc system, place a 99.99% graphite rod in the chamber, and vacuum the chamber Vacuum to a vacuum degree of 5Pa, and then feed a mixed gas of nitrogen and hydrogen to a vacuum degree of 20kPa, and the volume ratio of nitrogen to hydrogen is 1:10;

[0048] (2) Turn on the arc equipment and carry out arc stripping for 15s, and the graphene material is deposited on the metal film to obtain a graphene porous film with a thickness of 8 μm;

[0049] (3) the graphene porous film obtained in step (2) is fixed in the chamber of the electron beam deposition system, and the chamber is evacuated so that the vacuum degree reaches 4 × 10 -6 toor, the voltage is 10KV, and the current is 115mA. Platinum meta...

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Abstract

The invention discloses a method for preparing an ultra-low platinum fuel cell based on a graphene porous membrane. The method comprises the following steps of: depositing electric arc stripping graphene on a cheap aluminum foil in a porous film form by adopting an electrostatic adsorption physical mode; respectively covering platinum metal catalytic particles and ion resin on the graphene porous membrane by means of electron beam deposition and electrostatic spraying; finally completely transferring the prepared graphene porous membrane onto a proton exchange membrane by means of hot-pressing transfer printing, thereby constructing the ultra-low platinum fuel cell membrane electrode based on the graphene porous membrane structure. The method is simple in principle, easy to operate and short in preparation period; and the prepared ultra-low platinum fuel cell membrane electrode has higher power density and higher current density.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a method for preparing an ultra-low platinum fuel cell membrane electrode based on a graphene porous membrane. Background technique [0002] Fuel cell is an online power generation device that converts chemical energy into electrical energy. Due to breaking through the efficiency limitation of traditional internal combustion engines, fuel cell engines are considered to be the most important development direction of power devices in the future. The most important part inside the fuel cell is the membrane electrode (MEA). MEA (Membrane Electrode Assembly) is also translated as a membrane electrode. It is the key core component of fuel cell power generation. The catalyst layer in it determines the performance of the membrane electrode. The most important structure is good or bad, and it is also the most important factor that determines whether a fuel cell can achieve low platinum l...

Claims

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Application Information

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IPC IPC(8): H01M8/1004H01M4/86H01M4/88H01M4/92
CPCH01M8/1004H01M4/8605H01M4/881H01M4/8825H01M4/926Y02E60/50
Inventor 田植群郝超孟庆好颜博文沈培康
Owner GUANGXI UNIV