Method for continuously preparing ordered membrane electrode catalyst layer on large scale

A catalytic layer and membrane electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process and poor stability, achieve excellent strength, improve catalytic activity and durability, and facilitate large-scale continuous production Effect

Inactive Publication Date: 2019-06-14
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of complex preparation process for ordering the catalytic layer and poor stability of large-scale preparation when constructing the proton exchange membrane interface structure in the membrane electrode currently used for fuel cells, the present invention proposes a large-scale continuous preparation of membrane electrode A method of ordering the catalytic layer, thereby improving the electrical conductivity and water transport performance of the ceramic substrate, and increasing the service life of the gas diffusion layer material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add the nano-catalyst to the Nafion solution, disperse it evenly by ultrasonic, then add the polytetrafluoroethylene fiber, stir well to make the catalyst completely adhere to the polytetrafluoroethylene fiber, and then use the fluidized bed to dry to obtain the modified polytetrafluoroethylene Ethylene fiber; the nanocatalyst is the Pt / C catalyst particles with an average particle diameter of 8nm; the model of Nafion solution is D117, and the mass concentration is 5%; in the preparation of modified polytetrafluoroethylene fiber, Nafion solution, nanocatalyst, polytetrafluoroethylene The mass ratio of vinyl fiber is 100:4:4;

[0031] (2) Mix the modified polytetrafluoroethylene fiber with perfluorosulfonic acid resin and carbon fiber evenly, then send it into the internal mixer for mixing, and then melt and extrude through the screw, and calender to form a film to obtain the catalyst membrane embryo; mixing The temperature is 130°C, and the mixing time is 45 minutes...

Embodiment 2

[0034] (1) Add the nano-catalyst to the Nafion solution, disperse it evenly by ultrasonic, then add the polytetrafluoroethylene fiber, stir well to make the catalyst completely adhere to the polytetrafluoroethylene fiber, and then use the fluidized bed to dry to obtain the modified polytetrafluoroethylene Ethylene fiber; the nanocatalyst is the Pt / C catalyst particles with an average particle diameter of 5nm; the model of Nafion solution is D520, and the mass concentration is 10%; in the preparation of modified polytetrafluoroethylene fiber, Nafion solution, nanocatalyst, polytetrafluoroethylene The mass ratio of vinyl fiber is 100:2:30;

[0035] (2) Mix the modified polytetrafluoroethylene fiber with perfluorosulfonic acid resin and carbon fiber evenly, then send it into the internal mixer for mixing, and then melt and extrude through the screw, and calender to form a film to obtain the catalyst membrane embryo; mixing The temperature is 120°C, and the mixing is 50 minutes; in ...

Embodiment 3

[0038] (1) Add the nano-catalyst to the Nafion solution, disperse it evenly by ultrasonic, then add the polytetrafluoroethylene fiber, stir well to make the catalyst completely adhere to the polytetrafluoroethylene fiber, and then use the fluidized bed to dry to obtain the modified polytetrafluoroethylene Ethylene fiber; the nanocatalyst is the Pt / C catalyst particles with an average particle diameter of 10nm; the model of Nafion solution is D1020, and the mass concentration is 5%; in the preparation of modified polytetrafluoroethylene fiber, Nafion solution, nanocatalyst, polytetrafluoroethylene The mass ratio of vinyl fiber is 100: 5: 50;

[0039] (2) Mix the modified polytetrafluoroethylene fiber with perfluorosulfonic acid resin and carbon fiber evenly, then send it into the internal mixer for mixing, and then melt and extrude through the screw, and calender to form a film to obtain the catalyst membrane embryo; mixing The temperature is 140°C, and the mixing time is 40 mi...

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Abstract

The invention relates to the technical field of new energy batteries, in particular to a method for continuously preparing an ordered membrane electrode catalyst layer on a large scale. The catalyst layer is prepared by modifying polytetrafluoroethylene fibers with nano-catalysts, then carrying out mixing melting extrusion on the modified polytetrafluoroethylene fibers, perfluorinated sulfonic acid resin and carbon fibers, carrying out calendering to prepare a catalyst membrane blank, and finally carrying out heating and longitudinal stretching. According to the membrane electrode catalyst layer prepared with the method provided by the invention, the toughness and the strength are excellent, the carbon fibers and the catalysts are orderly arranged in a fiber shape; channels are provided for electron and proton transmission; micro-channels beneficial to gas and water transmission are reserved after being attached to a proton exchange membrane, so that the catalytic activity and the durability are improved; and moreover, the preparation method is simple and easy to control, and is easy for large-scale continuous production.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to the technical field of fuel cells, and in particular to a large-scale and continuous preparation method for orderly catalytic layers of membrane electrodes. Background technique [0002] A hydrogen fuel cell is an energy conversion device that can directly convert chemical energy stored in fuel (hydrogen) and oxidant (oxygen in the air) into electrical energy. Its basic working principle is the reverse process of electrolysis of water. Among them, proton exchange membrane fuel cell, also known as polymer electrolyte membrane fuel cell, is an emerging, efficient and environmentally friendly energy conversion application battery, which is widely used in the fields of transportation, fixed and mobile power sources. [0003] In the proton exchange membrane fuel, the membrane electrode is one of the key factors determining the performance of the proton exchange membrane f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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