Continuous coating process for fuel cell membrane electrode (CCM)

A fuel cell membrane and coating process technology, applied in battery electrodes, devices for coating liquid on surfaces, coatings, etc., can solve the problem of uneven distribution of polymer proton conductors, uneven mixing and dispersion of catalyst slurry, and catalyst utilization. rate loss and other problems, to achieve the effect of improving the use efficiency and electrochemical performance, increasing the porosity and catalytic efficiency, and improving the dispersion efficiency and dispersion effect.

Active Publication Date: 2022-03-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the dispersion effect of the slurry is poor, the prepared catalyst slurry is unevenly mixed and dispersed, and it is easy to delaminate and settle.
At the same time, the distribution of polymer proton conductors in the catalytic layer prepared by the existing method is not uniform, which is not conducive to the transmission of reaction gases, resulting in the loss of catalyst utilization and the reduction of battery life.

Method used

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  • Continuous coating process for fuel cell membrane electrode (CCM)
  • Continuous coating process for fuel cell membrane electrode (CCM)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take by weighing 10g 5% Nafion resin liquid, 40g Virahol and 1g ammonium bicarbonate and mix together, ultrasonic 10min, ultrasonic frequency is 10Hz, disperses evenly, obtains the colloidal form dispersion liquid that particle size is 20nm;

[0031] (2) Under vacuum anaerobic condition, take by weighing 2g 10% Pt / C solid particles and add in the colloidal dispersion obtained in step (1), first carry out ultrasonic mixing for 10min, then carry out ultrasonic-assisted high-speed stirring and disperse for 15min, the ultrasonic frequency is 50Hz, the stirring speed is 10000RPM. During the ultrasonic-assisted high-speed stirring process, the ultrasonic oscillation equipment adopts high and low temperature water bath circulation to keep the dispersion temperature of the catalyst slurry at 25°C;

[0032] (3) Use roll-to-roll continuous coating equipment to uniformly coat the catalyst slurry prepared by step (2) on the proton exchange membrane, control the dry thickness of ...

Embodiment 2

[0039] (1) Take by weighing 20g20% Nafion resin liquid, 80g Virahol and 8g Polyethylene Glycol and mix together, ultrasonic 10min, ultrasonic frequency is 50Hz, obtains the colloidal form dispersion liquid that particle diameter is 50nm;

[0040] (2) Under vacuum anaerobic condition, take by weighing 30g 90% Pt / C solid particles and add in the colloidal dispersion obtained in step (1), first carry out ultrasonic mixing for 10min, then carry out ultrasonic-assisted high-speed stirring and disperse for 15min, and the ultrasonic frequency is 100Hz, the stirring speed is 20000RPM. During the process of ultrasonic-assisted high-speed stirring, the ultrasonic oscillation equipment adopts high and low temperature water bath circulation to keep the dispersion temperature of the catalyst slurry at 25°C;

[0041] (3) Use roll-to-roll continuous coating equipment to uniformly coat the catalyst slurry prepared by step (2) on the proton exchange membrane, control the dry thickness of the ca...

Embodiment 3

[0048] (1) Take by weighing 15g 10% Nafion resin liquid, 60g isopropanol and 4g lithium carbonate and mix together, ultrasonic 10min, ultrasonic frequency is 80Hz, obtains the colloidal form dispersion liquid that particle size is 50nm;

[0049] (2) Under vacuum anaerobic condition, take by weighing 10g 40% Pt / C solid particle and add in the colloidal dispersion liquid gained in step (1), carry out ultrasonic mixing 10min first, carry out ultrasonic assisted high-speed stirring and disperse 15min again, ultrasonic frequency is 90Hz, the stirring speed is 15000RPM. During the ultrasonic-assisted high-speed stirring process, the ultrasonic oscillation equipment adopts high and low temperature water bath circulation to keep the dispersion temperature of the catalyst slurry at 25°C;

[0050] (3) Use roll-to-roll continuous coating equipment to uniformly coat the catalyst slurry prepared by step (2) on the proton exchange membrane, control the dry thickness of the catalytic layer to...

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Abstract

The invention discloses a continuous coating process for a fuel cell membrane electrode (CCM). The continuous coating process comprises the following steps: mixing a high-molecular polymer, an alcohol organic solvent, a pore-foaming agent and solid catalyst particles, and uniformly stirring and dispersing at a high speed under the assistance of ultrasonic waves; coating the proton exchange membrane with the catalyst slurry by using roll-to-roll continuous coating equipment to form a catalyst layer I; transferring the formed catalyst layer I into a dipping tank I, removing the pore-foaming agent, and then carrying out secondary continuous coating to obtain a catalyst layer II; transferring the formed catalyst layer II into a dipping tank II, removing the pore-foaming agent again, and drying to form a porous catalyst layer; according to the invention, the pore-forming agent is selectively added, and coating and dipping removal are carried out for multiple times, so that the porosity of the catalyst layer is greatly increased, the transmission resistance of gas in the catalyst layer is reduced, the membrane electrode with high mass transfer capability is constructed, the performance of the battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to a continuous coating process for a catalytic layer of a fuel cell membrane electrode, which belongs to the field of fuel cell membrane electrodes. Background technique [0002] For proton exchange membrane fuel cells using hydrogen as fuel, its electrochemical catalytic activity is mainly restricted by the electrode, because the catalytic activity of the Pt catalyst, especially for the reduction reaction of cathode oxygen, is low. The cathode and anode catalytic layers generally use carbon-supported nano-Pt, Pd noble metals or their alloys as catalysts. During the electrochemical process at the cathode of the fuel cell, the oxygen in the air diffuses to the proton exchange membrane through the gas diffusion layer (GDL), and the hydrogen protons generated by the electrochemical reaction at the anode are transferred to the cathode through the proton exchange membrane. After the protons and oxygen meet at the active sites on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D7/04B05D7/00B05D1/38B05D1/18H01M4/88
CPCB05D7/24B05D7/04B05D7/544B05D7/546B05D1/18B05D1/38H01M4/88Y02E60/50
Inventor 张洪杰郝金凯邵志刚林永俐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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