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Activation method for membrane electrode of fuel cell

A technology of fuel cell membrane and activation method, which is applied in the field of activation of fuel cell membrane electrodes and can solve the problems of long activation time and the like

Active Publication Date: 2008-02-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a fuel cell membrane that can make the battery have a large output power in a short time in order to overcome the defect that the existing fuel cell membrane electrode activation method requires a long activation time to achieve high output power. Electrode activation method

Method used

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  • Activation method for membrane electrode of fuel cell

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Effect test

Embodiment 1

[0028] This embodiment illustrates the activation method of the fuel cell membrane electrode provided by the present invention

[0029] 1. Preparation of Membrane Electrode

[0030] (1) 0.2 parts by weight of carbon black (Vulcan XC72R, Cabot company) and 0.1 parts by weight of PTFE emulsion (FR303A, Shanghai Sanaifu New Material Co., Ltd.) with a solid content of 60% by weight, and 10 parts by weight of deionized water are mixed , ultrasonically dispersed for 30 minutes to obtain a carbon dispersion, and then the carbon dispersion was coated on carbon paper (TGP-H-90, Toray Company), and the weight gain of the carbon paper after drying at 100°C was 1 mg / cm 2 , and then placed in a high-temperature oven at 350 ° C for 20 minutes to obtain a gas diffusion layer;

[0031] (2) 0.2 parts by weight of Pt / C catalyst (Hispec8100, product of Johnson Matthey Company) with platinum loading of 47.7% by weight and 2 parts by weight of nafion dispersion (DE520, product of DUPONT Company) ...

Embodiment 2

[0038] This embodiment illustrates the activation method of the fuel cell membrane electrode provided by the present invention

[0039] Prepare and activate the membrane electrode according to the method of Example 1, the difference is that the temperature of the battery is controlled to 80 ° C, and a sliding rheostat with a resistance value of 2 ohms is connected in series between the external power supply and the fuel cell, sliding the sliding rheostat, adjusting the external The current of the power supply stabilizes the voltage of the fuel cell at 0.6 volts, discharges the fuel cell for 30 minutes, then continues to adjust the current of the external power supply to stabilize the voltage of the fuel cell at 0.4 volts, discharges the fuel cell for 30 minutes, and then disconnects the external power supply, Make the fuel cell stop discharging, leave it on hold for 1 minute, and then repeat the above steps 5 times, then the discharge current density of the fuel cell is stable ...

Embodiment 3

[0041] This embodiment illustrates the activation method of the fuel cell membrane electrode provided by the present invention

[0042] The membrane electrode was prepared and activated according to the method of Example 1, except that the temperature of the battery was controlled at 55° C., and the temperature of the humidified hydrogen and humidified air was 50° C. And directly connect the potentiostat (Shenzhen Yishite Electronics Co., Ltd., DC regulated power supply) to the two ends of the fuel cell, adjust the voltage of the constant voltage potentiometer to stabilize the voltage of the fuel cell to 0.6 volts, and discharge the fuel cell 10 minutes, then continue to adjust the voltage of the constant voltage potentiometer so that the voltage of the fuel cell is 0.4 volts, discharge the fuel cell for 30 minutes, then disconnect the external power supply, stop the discharge of the fuel cell, leave it for 2 minutes, and then adjust the constant voltage potential again The vo...

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Abstract

This invention relates to a method for activating the membrance electrode of fuel cell. The procedures comprise: the positive pole fuel and negative pole fuel are fed into positive pole chamber and negative pole chamber respectively, thus makes the cell discharging, which is multi-stage discharging, including at least one time-interval between the stages, and the discharging being under constant voltage. This invention method makes the activating operation being fulfilled in a short period, and gives higher outpul power.

Description

technical field [0001] The invention relates to a method for activating a membrane electrode, more specifically, relates to a method for activating a fuel cell membrane electrode. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy stored in fuels (such as hydrogen, lower alcohols, etc.) and oxidants (oxygen) into electrical energy according to electrochemical principles. Fuel cells have the advantages of high energy conversion rate and environmental friendliness, while Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of low temperature operation and high specific power, and is a new type of power source widely used. [0003] The reaction formulas of the anode reaction and the cathode reaction of the fuel cell using hydrogen as fuel are shown in the reaction formulas (1) and (2) respectively, and the oxygen used as the oxidant on the cathode is usually from the air. The ion conduction that transfers the protons...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/02
CPCY02E60/50Y02P70/50
Inventor 翟玉清
Owner BYD CO LTD
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