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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: 2006-05-17
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-transitional layer, which affects the proton transport; in addition, the gas diffusion layer on both sides and the CCM Generally, cold contacts are used, and the contact resistance between them is usually large

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
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Effect test

Embodiment 1

[0043] Preparation of the membrane electrode main unit. A layer of hydrophobic layer (sublayer) composed of conductive carbon black and polytetrafluoroethylene (PTFE) particles was evenly compounded on the surface of the hydrophobically treated carbon paper, and calcined at 350°C for 20min to obtain a gas diffusion layer. Prepare catalyst slurry according to carbon-supported platinum catalyst: Nafion® resin: isopropanol is a mass ratio of 3: 1: 300, get part of the slurry, and print to the second hydrophobic layer (sublayer) of the gas diffusion layer by screen printing side, vacuum-dried for 1-10 hours, so that the catalyst layer is hardened on the surface of the gas diffusion layer. Mix 33ml of tetraethyl orthosilicate and 300ml of absolute ethanol evenly, then dropwise add a mixture of 240ml of absolute ethanol and 60ml of 0.3M hydrochloric acid, and keep stirring at a temperature of 50°C for 12h to obtain nano-SiO 2 of aqueous solution. nano-SiO 2 The aqueous solution i...

Embodiment 2

[0046] The preparation method of the membrane electrode main unit and the single cell assembly and test conditions are the same as in Example 1, except that the water-retaining layer is mainly composed of nano-TiO 2 And Nafion resin composition. Its preparation method is as follows: add 25ml of glacial acetic acid to 100ml of tetrabutyl titanate, mix well, slowly pour into 600ml of water under vigorous stirring, continue stirring for 3h, after hydrolysis is complete, add 10ml of 70wt% nitric acid, After heating to 80 °C, continue to stir for 2 h to prepare nano-TiO 2 colloidal solution. Then the nano-TiO 2 The aqueous solution was mixed with isopropanol and 5wt% Nafion solution, and ultrasonicated for 30 min. The volume ratio of isopropanol to 5wt% Nafion solution is 2: 1; if TiO 2 and the mass of Nafion resin is 100%, then TiO 2 The proportion is 10wt%. The average thickness of the prepared cathode catalyst layer (the side with the hydrophobic layer) is 4 μm, and the av...

Embodiment 3

[0048] The preparation method of the membrane electrode main unit and the single cell assembly and test conditions 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. Its preparation method is as follows: take 1.5M zirconium oxychloride (ZrOCl 2 ) solution 100ml and the dehydrated alcohol of 400ml are evenly mixed, then dropwise add the mixed solution of the dehydrated alcohol of 400ml and 20ml 1M phosphoric acid, continue to stir 24h under the temperature of 80 ℃, obtain containing nanometer Zr (HPO 4 ) 2 of aqueous solution. Then Zr(HPO 4 )2 The aqueous solution was mixed with isopropanol and 5wt% Nafion solution, and ultrasonicated for 10 min. The volume ratio of Virahol and 5wt% Nafion solution is 2: 1; if Zr(HPO 4 ) 2 And the quality of Nafion resin is 100%, then Zr(HPO 4 ) 2 The proportion is 10wt%. The average thickness of the prepared cathode catalyst layer (the side with th...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/92H01M4/88H01M8/10H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 木士春余军潘牧袁润章
Owner WUHAN UNIV OF TECH
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