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Proton exchange membrane applied to direct methanol fuel cell and preparation method thereof

A technology of proton exchange membrane and fuel cell, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems of poor thermal stability, expensive equipment, complicated process, etc., and achieve the reduction of methanol permeation efficiency, high proton conductivity

Inactive Publication Date: 2011-04-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it maintains a certain conductivity and battery performance while reducing the penetration of methanol, this method is expensive, the process is too complicated, and the operation is too cumbersome.
[0009] Dimitrova et al [Solid State Ionics, 2002, 150: 115-122] blended Nafion solution with fumed silica and phosphomolybdic acid, and then cast it into a film, and the alcohol resistance was improved, but it was under DAFC working conditions poor thermal stability

Method used

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  • Proton exchange membrane applied to direct methanol fuel cell and preparation method thereof
  • Proton exchange membrane applied to direct methanol fuel cell and preparation method thereof
  • Proton exchange membrane applied to direct methanol fuel cell and preparation method thereof

Examples

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Embodiment 1

[0028] Embodiment 1: in Nafion resin solution (DE-520, produced by DuPont), add tetraphenylporphyrin in the ratio of Nafion resin: tetraphenylporphyrin=1: 0.005, cast on a clean glass plate after stirring film forming. After drying at 60°C, cool to room temperature and remove the film. Place the peeled membrane in 1M H 2 SO 4 Soak in aqueous solution for 24h. Take it out for washing and soak it in deionized water for later use. The Nafion membrane modified by tetraphenylporphyrin was obtained.

Embodiment 2

[0029] Example 2: In Nafion resin solution (DE-520), tetraphenylporphyrin was added according to Nafion resin:tetraphenylporphyrin=1:0.01, stirred and cast on a clean glass plate to form a film. After drying at 60°C, cool to room temperature and remove the film. Place the peeled membrane in 1M H 2 SO 4 Soak in aqueous solution for 24h. Take it out for washing and soak it in deionized water for later use. The Nafion membrane modified by tetraphenylporphyrin was obtained.

Embodiment 3

[0030]Example 3: In Nafion resin solution (DE-520), tetraphenylporphyrin was added in the ratio of Nafion resin:tetraphenylporphyrin=1:0.05, stirred and cast on a clean glass plate to form a film. After drying at 60°C, cool to room temperature and remove the film. Put the peeled membrane at 1MH 2 SO 4 Soak in aqueous solution for 24h. Take it out for washing and soak it in deionized water for later use. The Nafion membrane modified by tetraphenylporphyrin was obtained.

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Abstract

The invention discloses a proton exchange membrane applied to a direct methanol fuel cell and a preparation method thereof. The method comprises steps of adding porphyrin compound into a Nafion resin solution according to the mass ratio of porphyrin compound to Nafion resin to be 5-50:1000, wherein the porphyrin compound comprises tetraphenyl porphyrin, tetra-sulpho-phenyl porphyrin and tetra-amino-phenyl porphyrin; and carrying out membrane methods such as casting method, pasting method and gumming method on the Nafion resin solution of the porphyrin compound to prepare the modified proton exchange membrane. In the invention, molecules of porphyrin compound, which are not penetrated through methanol and conduct ions are embedded or bonded into the ion channel of a nafion membrane of a perfluorosulfonic membrane by physical or chemical methods to form a structure of hydrogen ion sieve, thereby maintaining higher protons conduction ability and reducing the methanol through rate greatly.

Description

technical field [0001] The invention relates to a proton exchange membrane, in particular to a modified proton exchange membrane applied to a direct alcohol fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an electrochemical device that can directly convert chemical energy into electrical energy. It has the characteristics of high energy conversion efficiency, environmental friendliness, high specific energy (compared to batteries), low operating temperature, and fast start-up. , has aroused widespread attention from all over the world. Proton exchange membrane fuel cells that directly use liquid alcohol as fuel are commonly known as direct alcohol fuel cells (Direct alcohol fuel cell, DAFC). Its outstanding advantages are that the source of alcohol is abundant and easy to obtain, the price is cheap, and it is easy to carry and store. At the same time, compared with general hydrogen-oxygen proton exchan...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/18C08K5/3415C08K5/42H01M8/02H01M2/16H01M8/1011H01M8/1039
CPCY02E60/50Y02E60/12
Inventor 于非张果戈周震涛
Owner SOUTH CHINA UNIV OF TECH
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