Methanol rejective membrane for direct methanol fuel cell as well as preparation method and application thereof

A technology of methanol fuel cell and alcohol barrier film, which is applied to fuel cell parts, battery pack parts, circuits, etc. It can solve the problems of expensive catalyst, high oxidation overpotential, slow methanol oxidation rate, etc., and achieve high power efficiency. Density and fuel utilization, reduced methanol penetration, and good application prospects

Inactive Publication Date: 2013-10-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still many scientific and technical problems to be solved in order to achieve practical application of direct methanol fuel cells. The main problems are as follows: (1) The rate of methanol electrooxidation is slow. The overpotential is high, so that the actual output voltage is much lower than the theoretical potential; (2) The cathode is severely flooded, and the water produced by the cathode reaction and the water diffused by the anode accumulate in the cathode, blocking the pores inside the electrode, and limiting the cathode reactants and products. The mass transfer of the electrode reaction is limited; (3) the catalyst is expensive and the dosage is large, which makes the cost of DMFC higher; (4) methanol easily penetrates into the cathode through the solid electrolyte membrane, which not only reduces the fuel utilization rate, but also Causes a reduction in the oxygen reduction activity of the cathode catalyst, creating a "mixed potential" on the cathode, resulting in reduced battery performance
However, these methods also cause loss of battery performance due to charge transfer overpotential

Method used

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  • Methanol rejective membrane for direct methanol fuel cell as well as preparation method and application thereof
  • Methanol rejective membrane for direct methanol fuel cell as well as preparation method and application thereof
  • Methanol rejective membrane for direct methanol fuel cell as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Preparation and Application of Monolayer GO Modified Alcohol-resisting Film

[0070] The preparation steps of the monolayer GO modified alcohol barrier film are as follows:

[0071] 1. Pretreatment of Nafion membrane

[0072] Cut two pieces of 3cm×3cm DuPont’s Nafion212 film, put in 5wt.%H 2 o 2 Boil in aqueous solution for about 1 hour until the light yellow film becomes colorless and transparent; rinse 8 times with ultrapure water; then rinse with 0.5M H 2 SO 4 Boil for about 1 hour to protonize the membrane; then wash it with ultrapure water 8 times to get the following figure 1 The membrane (A) shown is stored in ultrapure water for future use.

[0073] 2. Preparation of graphene oxide

[0074] Weigh 11g K 2 S 2 o 8 and 18g P 2 o 5 Placed in a three-necked flask, add 80mL of concentrated H 2 SO 4 After the oil bath was heated to 80°C, 10g of dried natural flake graphite powder (particle size less than 45 μm) was added, and the heating was stopped when t...

Embodiment 2

[0093] Preparation and Application of Example 2 Double-layer GO Modified Alcohol-resisting Membrane

[0094] The preparation steps of the bilayer GO-modified alcohol barrier film are as follows:

[0095] 1. Pretreatment of Nafion membrane

[0096] Cut two pieces of 3cm×3cm Nafion212 film, put in 5wt.%H 2 o 2 Boil in aqueous solution for about 1 hour until the light yellow film becomes colorless and transparent; rinse 5 times with ultrapure water; then rinse with 0.5M H 2 SO 4 After boiling for about 1 hour, the membrane is protonated; then washed 5 times with ultrapure water to obtain the following figure 1 The membrane (A) shown is stored in ultrapure water for future use.

[0097] 2. Preparation of alcohol barrier film

[0098] The above film (A) was soaked in 20mM PDDA solution for 10 minutes, taken out and rinsed with ultrapure water, and dried naturally to obtain the film (B), soaked in the graphene oxide aqueous dispersion described in Example 1 for 10 minutes, Ta...

Embodiment 3

[0104] Example 3 Preparation and application of monolayer GO modified alcohol barrier film

[0105] The preparation steps of the monolayer GO modified alcohol barrier film are as follows:

[0106] 1. Pretreatment of Nafion membrane

[0107] Cut a piece of 3cm×3cm DuPont’s Nafion212 film, put it in 3wt.%H 2 o 2 Boil in aqueous solution for about 2 hours until the light yellow film becomes colorless and transparent; rinse with ultrapure water for 6 times; then rinse with 1M H 2 SO 4 Cook for about 2 hours to protonize the membrane; then wash it with ultrapure water for 6 times to obtain the following figure 1 The membrane (A) shown is stored in ultrapure water for future use.

[0108] 2. Preparation of graphene oxide

[0109] Weigh 5g K 2 S 2 o 8 and 10g P 2 o 5 Placed in a three-neck flask, add 50 mL of concentrated H 2 SO 4 After the oil bath was heated to 50°C, 5g of dried natural flake graphite powder (particle size less than 45 μm) was added, and the heating wa...

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Abstract

The invention discloses a methanol rejective membrane for a direct methanol fuel cell as well as a preparation method and application thereof. The methanol rejective membrane is formed by a Nafion membrane and a composite layer. The preparation method comprises the following steps: 1) pretreating the Nafion membrane to obtain a membrane A; 2) immersing the membrane A in a poly(diallyldimethylammonium chloride) solution to ensure that the surface of the membrane A carries positive charges by an electrostatic self-assembly method to form a membrane B; and 3) immersing the membrane B in a graphene oxide aqueous solution to form the methanol rejective membrane. The methanol rejective membrane can be applied to preparation of a membrane electrode assembly, can be used for improving the performance of a direct methanol fuel cell system and the utilization of fuel; the preparation method has the characteristics of environmental friendliness and the like, is simple and easy to operate, and has a good application prospect.

Description

technical field [0001] The invention relates to a film for direct methanol fuel cell and its preparation method and application, in particular to an alcohol barrier film for direct methanol fuel cell and its preparation method and application. Background technique [0002] With the rapid development of the electronics and information industries, wireless communication devices and various portable consumer electronics products continue to emerge and grow rapidly, with increasingly powerful functions. Users have higher requirements for the performance of the configured batteries, and the market demand is huge. How to manufacture a new type of mobile power supply with high specific energy, longer battery life, and safer has been a hot spot in global research in recent years, and it is also an urgent requirement for my country to actively respond to international competition and occupy the commanding heights of the mobile electronics industry chain with huge market prospects. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04H01M2/16H01M8/02
CPCY02E60/12Y02E60/50
Inventor 杨辉袁婷黄庆红张海峰薛新忠邹志青
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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