Method for preparing multilayer alcohol-resistant membrane electrode of direct methanol fuel cell

A methanol fuel cell and alcohol-repelling film technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of inability to achieve mass production and high price, and achieve easy mass production, improve utilization rate, and optimize transmission. The effect of quality and three-dimensional structure

Inactive Publication Date: 2009-12-30
江苏雷石新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of these products cannot be mass-produced, and the price is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the preparation method of the multilayer alcohol barrier film electrode of the direct methanol fuel cell comprises the following steps:

[0020] (1) Proton exchange membrane pretreatment: treat the proton exchange membrane perfluorosulfonic acid resin membrane (Nafion membrane) in hydrogen peroxide solution, dilute sulfuric acid and deionized water in sequence to remove impurities on the membrane;

[0021] (2) Preparation of the diffusion layer: the acetylene black modulated with polytetrafluoroethylene (PTFE) is layered and prepared on the carbon cloth by the screen printing method to form a diffusion layer with a controllable microporous channel structure;

[0022] (3) The cathode catalyst Pt / C, the anode catalyst Pt-Ru / C, water and Nafion / PTFE are ultrasonically oscillated to form an ink-like mixture by ultrasonic spraying, and the pretreated perfluorosulfonic acid resin film is directly prepared (Nafion film) surface, and dry;

[0023] (4) The a...

Embodiment 2

[0025] In this embodiment, the preparation method of the multilayer alcohol barrier film electrode of the direct methanol fuel cell comprises the following steps:

[0026] (1) Proton exchange membrane pretreatment: treat the proton exchange membrane perfluorosulfonic acid resin membrane (Nafion membrane) in hydrogen peroxide solution, dilute sulfuric acid and deionized water in sequence to remove impurities on the membrane;

[0027] (2) Preparation of the diffusion layer: the acetylene black modulated by polytetrafluoroethylene (PTFE) is layered and prepared on the carbon cloth by a flat brushing method to form a diffusion layer with a controllable microporous channel structure;

[0028] (3) The cathode catalyst Pt / C, the anode catalyst Pt-Ru / C, ethanol and Nafion / PTFE are ultrasonically oscillated to form an ink-like mixture by brushing, and the pretreated perfluorosulfonic acid resin film is directly prepared (Nafion film) surface, and dry;

[0029] (4) The anode diffusion ...

Embodiment 3

[0031] In this embodiment, the preparation method of the multilayer alcohol barrier film electrode of the direct methanol fuel cell comprises the following steps:

[0032] (1) Proton exchange membrane pretreatment: treat the proton exchange membrane perfluorosulfonic acid resin membrane (Nafion membrane) in hydrogen peroxide solution, dilute sulfuric acid and deionized water in sequence to remove impurities on the membrane;

[0033] (2) Preparation of the diffusion layer: the acetylene black modulated by polytetrafluoroethylene (PTFE) is layered and prepared on the carbon cloth by a flat brushing method to form a diffusion layer with a controllable microporous channel structure;

[0034] (3) The cathode catalyst Pt / C, the anode catalyst Pt-Ru / C, ethylene glycol and Nafion / PTFE are ultrasonically oscillated to form an ink-like mixture by ultrasonic spraying, and the pretreated perfluorosulfonic acid resin is directly prepared Membrane (Nafion membrane) surface, and dry;

[003...

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PUM

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Abstract

The invention relates to a method for preparing a multilayer alcohol-resistant membrane electrode of a direct methanol fuel cell, which comprises the following steps: (1) pretreatment of proton exchange membranes: treating the proton exchange membranes in hydrogen peroxide solution, dilute sulphuric acid and deionized water to remove the impurities on the membranes; (2) preparation of diffusion layers: preparing air-enriched carbon powder modulated by a hydrophobing agent on carbon cloth in layers to prepare the diffusion layers with controllable micropore channel structures; (3) performing ultrasonic vibration on cathode-anode catalysts, a solvent and a binding agent to blend into an ink-like mixture, preparing the ink-like mixture on the surfaces of the prepared proton exchange membranes directly, and drying the product; and (4) integrating an anode diffusion layer, the proton exchange membranes coated with the catalysts on the cathode / anode sides, and a cathode diffusion layer in a hot pressing mode. The method can improve the utilization rate of the catalysts, reduce the capacity of the cathode-anode catalysts to between 1 and 2 mg / cm<2>, achieve the internal water management of the membrane electrode, and can improve the utilization rate of the methanol fuel to over 70 percent.

Description

technical field [0001] The invention relates to a method for preparing a membrane electrode for a direct methanol fuel cell, in particular to a method for preparing a multilayer alcohol-resisting membrane electrode, which belongs to the field of fuel cells. Background technique [0002] Direct Methanol Fuel Cell (DMFC) is a device that directly converts chemical energy in methanol solution or pure methanol and oxygen into electrical energy through electrochemical reaction. Compared with other batteries, it has high energy density, wide range of fuel sources, and no charging. , low pollution and other advantages, it can be used as a portable power supply in electric vehicles, notebooks and other fields. However, due to its short research and development time, it is not mature enough in many technical aspects, which affects its process of productization. [0003] Membrane electrode assembly (MEA) is the core component of direct methanol fuel cell (DMFC). In addition to focusin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/88H01M8/1004H01M8/1011
CPCY02E60/50Y02P70/50
Inventor 朱长满
Owner 江苏雷石新能源科技有限公司
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