High temperature proton exchange film fuel cell membrane electrode and its preparing method

A fuel cell membrane and proton exchange membrane technology, applied in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve the problems of high contact resistance, affecting proton transmission, etc., and achieve good high-temperature water retention performance

Inactive Publication Date: 2005-02-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the CCM fuel cell architecture, the catalytic layer is coated or transferred to the proton exchange membrane, so the interface between the catalyst layer and the membrane is a non-transitio

Method used

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  • High temperature proton exchange film fuel cell membrane electrode and its preparing method
  • High temperature proton exchange film fuel cell membrane electrode and its preparing method
  • High temperature proton exchange film fuel cell membrane electrode and its preparing method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0042] Example 1

[0043] Preparation of the main unit of membrane electrode. A hydrophobic sublayer composed of conductive carbon black and polytetrafluoroethylene (PTFE) particles is uniformly laminated on the surface of the hydrophobic treated carbon paper, and calcined at 350° C. for 20 minutes to obtain a gas diffusion layer. The catalyst slurry was prepared according to the mass ratio of carbon-supported platinum catalyst: Nafion® resin: isopropanol of 3:1:300, and part of the slurry was taken and printed on the sublayer of the gas diffusion layer by screen printing. On the other hand, vacuum dry for 1-10 hours to harden the catalyst layer on the surface of the gas diffusion layer. Mix 33ml of ethyl orthosilicate with 300ml of absolute ethanol, then add dropwise a mixture of 240ml of absolute ethanol and 60ml of 0.3M hydrochloric acid. Stir continuously for 12h at a temperature of 50℃ to obtain nano-SiO 2 Aqueous solution. Nano SiO 2 The aqueous solution is mixed with isopro...

Example Embodiment

[0045] Example 2

[0046] The preparation method of the membrane electrode main unit and the assembly and test conditions of the single cell are the same as in Example 1, except that the water-retaining layer is mainly made of nano-TiO 2 And Nafion resin composition. The preparation method is as follows: add 25ml of glacial acetic acid to 100ml of tetrabutyl titanate and mix well, slowly pour into 600ml of water under vigorous stirring, continue stirring for 3h, after the hydrolysis is complete, add 10ml of 70wt% nitric acid, After heating to 80℃, continue to stir for 2h to prepare nano-TiO 2 Colloidal solution. Then the nano TiO 2 The aqueous solution was mixed with isopropanol and 5 wt% Nafion solution and ultrasonicated for 30 minutes. The volume ratio of isopropanol to 5wt% Nafion solution is 2:1; if TiO 2 And the quality of Nafion resin is 100%, then TiO 2 The proportion is 10wt%. The prepared cathode catalyst layer (the side where the hydrophobic layer is compounded) has an ...

Example Embodiment

[0047] Example 3

[0048] The preparation method of the membrane electrode main unit and the assembly and test conditions of the single cell are the same as in Example 1, except that the water-retaining layer is mainly composed of nano Zr (HPO) 4 ) 2 And Nafion resin composition. The preparation method is as follows: take 1.5M zirconium oxychloride (ZrOCl 2 ) 100ml of the solution and 400ml of absolute ethanol are uniformly mixed, and then a mixture of 400ml of absolute ethanol and 20ml of 1M phosphoric acid is added dropwise, and stirring is continued for 24h at a temperature of 80°C to obtain nano Zr(HPO 4 ) 2 Aqueous solution. Then Zr(HPO 4 ) 2 The aqueous solution was mixed with isopropanol and 5 wt% Nafion solution and ultrasonicated for 10 min. The volume ratio of isopropanol to 5wt% Nafion solution is 2:1; if Zr(HPO 4 ) 2 And the quality of Nafion resin is 100%, then Zr(HPO 4 ) 2The proportion is 10wt%. The prepared cathode catalyst layer (the side where the hydrophobic lay...

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Abstract

Membrane electrode is composed of secondary unit and main unit possessing function of high temperature and molding moisture. Secondary unit is a gaseous diffusion layer, and the main unit is prepared by binding gaseous diffusion layer, catalyst layer, and inorganic Nano particles to proton exchange layer. The preparation method includes following steps: coating pulp of catalyst on gaseous diffusion layer to prepare catalyst layer; casting inorganic Nano particles and resin solution of proton exchange to prepare inorganic Nano particles layer and proton exchange layer; then coating pulp of catalyst again to prepare catalyst layer. Membrane electrode is obtained by cold contact between main unit and secondary unit, or hot pressing the two units. Features are: suitable to continuous production, controllable thickness of proton exchange layer, high binding intensity between layers, low contact resistance, operatable under high temperature.

Description

technical field [0001] The invention relates to a membrane electrode of a proton exchange membrane fuel cell, in particular to a membrane electrode composed of a main unit with a high-temperature water retention function and a subunit composed of a gas diffusion layer. Background technique [0002] A fuel cell is a clean, efficient, and quiet-running electrochemical engine. It is generally believed that it will become a super industry in the middle of the 21st century and will bring about a revolution in the energy industry. The proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC) has a good application prospect in mobile communication equipment, portable electrical appliances, key equipment for national defense, automobile transportation and other industries. [0003] At present, high-temperature (>100°C) PEMFC has attracted widespread attention, because PEMFC can have the following advantages when working at a temperature greater than 100°C: 1...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/92H01M8/1004
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 木士春余军潘牧袁润章
Owner WUHAN UNIV OF TECH
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