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Self humidifying film electrode and its preparing method

A membrane electrode and self-humidification technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low weight specific power and volume specific power of the stack, increase the chance of cross-diffusion of hydrogen and oxygen gas, and increase the size of the fuel cell. Problems such as system size and weight can be solved to achieve the effect of improving weight specific power and volume specific power, simplifying design and manufacturing process, and light weight

Inactive Publication Date: 2007-10-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively maintain a good hydration state of the inner membrane of the stack, but it has the following disadvantages: (1) The volume and weight of the fuel cell system are increased, the system is relatively dispersed, and the weight specific power and volume specific power of the stack are relatively low. Low; (2) When the battery starts up quickly or the load changes suddenly and greatly, the humidification response often lags behind and cannot be synchronized with it in time
However, although this technology enhances the back-diffusion effect of cathode water, it is easy to cause film rupture, which increases the chance of cross-diffusion of hydrogen and oxygen gas and shortens the service life of the stack.

Method used

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  • Self humidifying film electrode and its preparing method
  • Self humidifying film electrode and its preparing method
  • Self humidifying film electrode and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first step, the Nafion115 membrane is placed in 5% hydrogen peroxide, distilled water, 0.5mol / L sulfuric acid solution and distilled water for 0.5 hours to pretreat the membrane. A stainless steel clip is clamped and fixed to prevent the membrane from shrinking or curling in the air;

[0024] In the second step, the carbon-supported platinum catalyst (the product of E-TEK Company of the United States, the same below), the perfluorosulfonic acid polymer (the Nafion solution with a mass percentage concentration of 5% of the product of Dupont Company of the United States, the same below), SiO 2 , The mixture of isopropanol and distilled water is uniformly mixed according to the mass ratio of 10:2:1:100, dispersed and mixed into ink by ultrasonic vibration, and coated on one side of the film, the loading of Pt is 0.6mg / cm 2 , and then put the film in an oven and bake it at 80°C for 40 minutes to prepare a hydrophilic hydrogen electrode;

[0025] The third step is to...

Embodiment 2

[0029]In the first step, the Nafion112 membrane is placed in 5% hydrogen peroxide, distilled water, 0.8mol / L sulfuric acid solution and distilled water and boiled for 45 minutes respectively to pretreat the membrane, and use the pretreated proton exchange membrane with Four stainless steel clips are clamped and fixed to prevent the membrane from shrinking or curling in the air;

[0030] In the second step, the carbon-supported platinum catalyst, perfluorosulfonic acid polymer, TiO 2 The mixture of glycerin, ethanol and distilled water is uniformly mixed at a mass ratio of 10:3:2:150, dispersed and mixed into ink by ultrasonic vibration, and coated on one side of the film, with a Pt loading of 0.4mg / cm 2 , and then put the film in an oven and bake it at 100°C for 30 minutes to prepare a hydrophilic hydrogen electrode;

[0031] The third step is to uniformly mix the mixture of carbon-supported platinum catalyst, perfluorosulfonic acid polymer, PTFE, ethanol and distilled water ...

Embodiment 3

[0035] In the first step, the Nafion117 membrane is placed in 3% hydrogen peroxide, distilled water, 1.0mol / L sulfuric acid solution and distilled water and boiled for 1 hour each to pretreat the membrane, and the pretreated proton exchange membrane Clamp and fix with four stainless steel clips to prevent the membrane from shrinking or curling in the air;

[0036] In the second step, the carbon-supported platinum catalyst, the perfluorosulfonic acid polymer, the mixture of succinic acid and propanesulfonic acid, and acetonitrile are uniformly mixed according to the mass ratio of 10:4:3:200, and the ink is mixed by ultrasonic vibration. On one side of the membrane, the Pt loading was 1.0 mg / cm 2 , and then put the film in an oven and bake it at 60°C for 60 minutes to prepare a hydrophilic hydrogen electrode;

[0037] In the third step, the carbon-supported platinum catalyst, perfluorosulfonic acid polymer, polysiloxane, and acetonitrile were uniformly mixed in a mass ratio of ...

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Abstract

This invention discloses a self-wetting film electrode and its preparation method, which pre-processes a proton exchange membrane, mixes a carbon carried Pt catalyst, a perfluorinated sulfonic acid polymer, a hydrophilic material and a low-boiling solvent to be coated on a side of the membrane to be dried to get a hydrophilic H-electrode, then mixes a carbon carried Pt catalyst, a perfluorinated sulfonic acid polymer, a hydrophobic material and a low-boiling solvent to coat them on the other side of the membrane to be dried to get a hydrophobic 0-electrode then sticks two pieces of carbon paper and the proton exchange membrane to get a self-wetting membrane electrode.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a self-humidifying membrane electrode. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is the first rapid development after alkaline fuel cell (AFC), phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (MCFC) and solid oxide fuel cell (SOFC). Five generations of fuel cells. PEMFC has the advantages of high power density, high energy conversion efficiency, low-temperature start-up, and environmental friendliness. It is the most promising power source for pollution-free and zero-emission electric vehicles. Proton exchange membrane (PEM) is one of the core components of PEMFC. It is very different from the diaphragm used in general chemical power supplies. It serves both as a dense, selectively permeable membrane and as a substrate for battery electrolytes (for proton transfer) and electrode act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M2/14C08J5/22
CPCY02E60/12Y02E60/50
Inventor 周震涛
Owner SOUTH CHINA UNIV OF TECH
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