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A carbon nano tube enhanced self-humidity increase compound proton exchange film and its preparation

A proton exchange membrane and carbon nanotube technology, applied in the field of proton exchange membranes, can solve the problems of not very high strength of PTFE, affecting the conductivity of the composite membrane, and the limitation of improving the strength of the composite membrane, so as to achieve increased strength, improved mechanical strength and high strength Effect

Active Publication Date: 2008-04-30
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Due to the relatively high volume content of PTFE in this type of composite membrane, it will significantly affect the electrical conductivity of the composite membrane, and the strength of PTFE is not very high, resulting in the limitation of the strength of the composite membrane.

Method used

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  • A carbon nano tube enhanced self-humidity increase compound proton exchange film and its preparation
  • A carbon nano tube enhanced self-humidity increase compound proton exchange film and its preparation
  • A carbon nano tube enhanced self-humidity increase compound proton exchange film and its preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Example 1: Take 3g of 5.4% Nafion solution and pour it into a small beaker, heat it on a hot stage at 50°C to volatilize the low-boiling organic solvent, then add 3ml of analytically pure DMF solution to redissolve the Nafion resin. Pt / CNTs with a Pt mass percentage of 1% prepared by carbon nanotubes with a diameter of 30nm and a length of about 3 μm were used as self-humidifying catalysts. Add 5mg of Pt / CNTs into the Nafion solution dissolved in DMF, and ultrasonically disperse for 10min to obtain a uniform Pt / CNTs-Nafion-DMF solution. Let stand to drive away the air bubbles in the solution, and pour it into an area of ​​20cm 2 Place the cast film frame on a horizontal heating platform. Then heat the volatile solvent on a hot stage at 50°C for 2h to form a film, take out the obtained film, then spray the mixed solution prepared by 0.185g 5.4% Nafion solution and 2g isopropanol on both sides, let it dry naturally, Pure Nafion resin layers with a thickness of 2.5 μm we...

Embodiment 2

[0076] Example 2: Pour 3g of 5.4% Nafion solution into a small beaker, heat on a hot stage at 50°C to evaporate the low-boiling point organic solvent, and then add 3ml of analytically pure DMF solution to redissolve the Nafion resin. Add 5 mg of multi-walled carbon nanotubes with a diameter of 30 nm and a length of about 3 μm to the Nafion-DMF solution, and ultrasonically disperse for 10 min to obtain a uniform CNTs-Nafion-DMF solution. Let stand to drive away the air bubbles in the solution, and pour it into an area of ​​20cm 2 Place the cast film frame on a horizontal heating platform. Then, heat on a hot stage at 50° C. for 2 h to evaporate the solvent to form a film, and take out the obtained CNTs-Nafion composite film. Take 1mg Pt / SiO 2 Catalyst and 0.185g 5.4% Nafion solution and 2g isopropanol are formulated into mixed solution, disperse in ultrasonic oscillator for 15 minutes and obtain homogeneous solution, wherein Pt / SiO 2 The mass percent content of Pt in the cat...

Embodiment 3

[0077] Example 3: Take 5g of 5.4% Nafion solution and pour it into a small beaker, heat it on a hot stage at 60°C to evaporate the low-boiling point organic solvent, then add 5ml of analytically pure DMF solution to redissolve the Nafion resin. Add 10 mg of multi-walled carbon nanotubes with a diameter of 10 nm and a length of about 1 μm to the Nafion-DMF solution, and ultrasonically disperse for 10 min to obtain a uniform CNTs-Nafion-DMF solution. Let it stand still to drive off the air bubbles in the solution, pour it into a flat glass cast film frame, and place the cast film frame on a horizontal heating platform. Then, heat on a hot stage at 50° C. for 2 h to evaporate the solvent to form a film, and take out the obtained CNTs-Nafion composite film. Take a certain amount of Pt / SiO 2 The catalyst, Nafion solution and isopropanol were dispersed in an ultrasonic oscillator for 15 minutes to obtain a homogeneous solution, in which Pt / SiO 2The mass percent content of Pt in th...

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Abstract

The invention relates to a fuel cell, in particular to a self-humidifying combined proton exchange membrane for a strengthening fuel cell based on a carbon nanotube and a preparation method thereof, which comprises the following steps: a solution casting method is utilized to prepare and obtain a strengthened perfluorosulfonic resin membrane of the carbon nanotube, and Pt is introduced into the membrane as self-humidifying catalyst, wherein, Pt can be directly carried on the carbon nanotube or carried on nano SiO2 particle, and the prepared membrane is 10-100 [mu]m thick. The prepared combined membrane thickness and nanotube content can be easily controlled, the manufactured membrane surface is level and smooth, not ventilate, has no short-circuit with good intensity, has better cell performance on self-humidifying operation, and can be safely applied to the fuel cell.

Description

technical field [0001] The invention relates to a proton exchange membrane of a fuel cell, in particular to a self-humidifying composite proton exchange membrane for a fuel cell reinforced by carbon nanotubes and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, high energy conversion efficiency, low temperature start-up, and environmental friendliness. It will be widely used in aerospace, military, energy and transportation and other fields. Proton exchange membrane (PEM) is one of the core components of PEMFC. It is very different from the diaphragm used in general chemical power sources. First of all, it is not only a diaphragm material, but also an electrolyte (proton transfer) and electrode active material ( Electrocatalyst) substrate; In addition, PEM is different from the usual porous film, it is a dense selective permeable membrane. An ideal PEM should have high proton con...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/10C08L101/02C08J5/22C08K3/04H01M8/1065H01M8/1081
CPCY02E60/523Y02E60/522Y02E60/50Y02P70/50
Inventor 衣宝廉刘永浩张华民
Owner SUNRISE POWER CO LTD
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