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Preparation method of membrane electrode commponent of proton exchange membrane fuel cell

A technology for proton exchange membranes and fuel cell membranes, which is applied to battery electrodes, electrical components, circuits, etc., can solve problems such as limited continuity and integration of catalytic layers, uneven catalytic layers, and membrane deformation, so as to reduce catalyst consumption and catalyze The effect of uniform layer and excellent performance

Inactive Publication Date: 2004-02-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the currently used commercial proton-conducting membranes have strong adsorption and swelling capabilities for the solvent in the catalyst ink, when the catalyst slurry is placed on the membrane, it will cause deformation of the membrane, which will affect the structure of the entire catalyst layer. Continuity, uniformity have a great influence
U.S. Patents US 6,074,692 and US 6,475,249 propose a method of pre-impregnating the proton exchange membrane solvent to eliminate the problem of uneven catalytic layer caused by swelling of the catalyst ink placed on the membrane, but in this method, H + Type proton exchange membrane, dried at less than 100°C, the continuity of the catalytic layer and the degree of integration with the membrane are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Hydrophobic treatment of carbon paper: first carbon paper (120 # , Toray company, Japan) dipping treatment in 35% PTFE emulsion, after drying at room temperature, place in muffle furnace, be heated up to 280 ℃ of constant temperature 30min to remove the surfactant in PTFE, then be heated up to 350 ℃ of constant temperature 30min, obtain PTFE50 % hydrophobic carbon paper.

[0031] Leveling treatment of carbon paper: Ultrasonically mix Vulcan-72 carbon black and PTFE emulsion to a slurry state, spray it on the surface of carbon paper after hydrophobic treatment with a spray gun, repeat the heating procedure of carbon paper hydrophobic treatment, and obtain level carbon paper. The anode PTFE content is 10%, the cathode is 30%, and the leveling layer content is about 2.5mg / cm 2 .

[0032] Membrane infiltration treatment: First, 5 × 5cm 112 Nafion membrane was treated with 3% H 2 o 2 Boil for 1 hour to remove surface pollutants, boil with twice distilled water for 30 min...

Embodiment 2

[0038] Get 5% Nafion solution (DuPont company, the U.S.) of 50ml amount, add the 0.2M NaOH of equimolar equivalent of sulfonate group, stir 12h to get Na + Type Nafion solution; 2) Weigh 40% Pt / C catalyst (E-Tek company, U.S.) according to the ratio of catalyst to Nafion dry weight 5:1, add isopropanol solution equal to the volume of Nafion solution, and carry out ultrasonication for 1h, The catalyst is fully dispersed and fully mixed with Nafion; 3) Add an equal volume of ethylene glycol solution of Nafion solution to the above mixed solution, fully ultrasonically mix, then increase the ultrasonic temperature, and remove water and isopropanol in the mixed solution to obtain Uniform, viscous mixed slurry of catalyst, Nafion and ethylene glycol.

[0039] Preparation of Membrane Electrode: 1) Fully infiltrated Na + Type Nafion 1135 membrane is placed in a 2.8×2.8cm glass frame, wipe off the remaining ethylene glycol on the surface of the membrane with absorbent cotton, and appl...

Embodiment 3

[0041] The 5 × 5cm type 117 Nafion membrane was subjected to 10% H 2 o 2 Boil for 1 hour to remove surface pollutants, boil with twice distilled water for 30 minutes (this process is repeated twice) and then place the membrane in 1M NaOH solution to completely transform the membrane into NaOH + type, after repeated washing with water, placed in hexanediol solution, and ultrasonically impregnated for 30 minutes, to obtain Na diol fully infiltrated + Type Nafion 117 membrane.

[0042] The procedure for catalyst slurry preparation is: catalyst, isopropanol, Na + Type Nafion solution is fully mixed to form a uniform mixed solution; 1,2-propanediol is added to the above mixed solution and fully mixed; the amount ratio of Nafion solution, isopropanol, and 1,2-propanediol is: the weight ratio of catalyst to Nafion is 5:1; the volume ratio of Nafion solution to isopropanol is 1:2; the volume ratio of Nafion solution to 1,2-propanediol is 1:3.

[0043] The preparation of the membra...

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PUM

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Abstract

The present invention relates to a preparation method of film electrode component for protein exchange film fuel cell. The catalyst slurry prepared by using low boiling point and low viscosity alcohol as dispering agent and using high boiling point and high viscosity alcohol as stabilizing agent can be directly coated on the surface of conductive film. The proton conductive film premoistened by high boiling point and high viscosity alcohol can not be deformed, after the catalyst slurry is coated on it, and can form the invented film electrode component with uniform, continuous and high-activecatalyst layer.

Description

technical field [0001] The invention relates to a preparation method for a high-efficiency membrane electrode assembly used in a proton exchange membrane fuel cell or a direct alcohol fuel cell. Background technique [0002] A fuel cell is a power generation device that converts chemical energy directly into electrical energy in an efficient and environmentally friendly manner. It has the advantages of high energy density, high energy conversion efficiency, no pollution, and can form battery stacks with different powers according to the needs of the application. It is considered to be a high-efficiency, energy-saving, and environmentally friendly power generation technology in the 21st century. According to the different electrolytes used, fuel cells are divided into alkaline fuel cells (AFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC) and proton exchange membrane fuel cells. Battery (PEMFC)...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 沈培康田植群方军
Owner SUN YAT SEN UNIV
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