Micro direct methanol fuel cell membrane electrode and preparation method thereof

A methanol fuel cell and membrane electrode technology, applied in fuel cells, battery electrodes, fuel cell components, etc., can solve problems such as battery performance degradation and cathode flooding

Active Publication Date: 2013-04-03
INFORMATION SCI RES INST OF CETC
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Problems solved by technology

Because methanol is easy to permeate the proton exchange membrane, the concentration of the methanol solution used as the anode fuel is usually low. However, the low concentration of methanol makes the water on the anode side easily penetrate into the cathode side. In addition, the chemica

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  • Micro direct methanol fuel cell membrane electrode and preparation method thereof

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specific Embodiment approach 1

[0029] Specific implementation mode one: as figure 1 As shown, the micro direct methanol fuel cell membrane electrode of the present embodiment consists of an anode diffusion layer (anode support layer 1, anode microporous layer 2), an anode catalyst layer 3, a proton exchange membrane 4, a cathode catalyst layer 5, and a cathode diffusion layer ( Cathode microporous layer 6 and cathode support layer 7). The anode catalytic layer 3 is located on the left side of the proton exchange membrane 4, the left side of the anode catalytic layer 3 is the anode microporous layer 2 and the anode support layer 1 successively, and the cathode catalytic layer 5 consists of the inner layer 5 a , middle layer 5 b and outer 5 c Composed of three layers, the closest to the cathode diffusion layer is the outer layer 5 c , the closest to the proton exchange membrane is the inner layer 5 a , between the inner and outer layers is the middle layer 5b, namely: the inner layer 5 a Located on the r...

specific Embodiment approach 2

[0030] Specific embodiment two: the preparation steps of the membrane electrode of the miniature direct methanol fuel cell of the present embodiment include the preparation of cathode and anode diffusion layer, the preparation of cathode and anode catalyst layer, and the formation of membrane electrode by hot pressing. The specific steps are as follows:

[0031] Step 1, preparation of cathode diffusion layer and anode diffusion layer:

[0032] Weigh 10mg of carbon powder XC-72R and 60mg of PTFE (polytetrafluoroethylene) emulsion with a mass percent concentration of 15%, and disperse it in 2ml of isopropanol aqueous solution (the volume ratio of isopropanol to water is 1:1), Ultrasonic oscillation for 30 minutes, followed by magnetic stirring for 30 minutes to obtain a uniformly mixed microporous layer slurry.

[0033] The microporous layer slurry was coated onto a 1 cm×1 cm carbon paper several times by brushing until the weight gain reached 4 mg. Dry the carbon paper coated ...

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Abstract

The invention discloses a micro direct methanol fuel cell membrane electrode and a preparation method thereof, and relates to a fuel cell and a preparation method thereof. The membrane electrode comprises an anode diffusion layer, an anode catalyst layer (3), a proton exchange membrane, a cathode catalyst layer (5) and a cathode diffusion layer, wherein the cathode catalyst layer (5) includes an inner layer (5a), an intermediate layer (5b) and an outer layer (5c); the outer layer (5c) is nearest to the cathode diffusion layer; and the inner layer (5a) is nearest to the proton exchange membrane. The preparation method comprises the following steps: taking carbon paper or carbon cloth as a supporting layer, then coating the diffusion layer formed by a carbon material, polytetrafluoroethylene and the like, coating a size formed by a catalyst, Nafion resin, a pore forming substance and the like for several times, and performing heat treatment and pressing to form the membrane electrode. The micro direct methanol fuel cell membrane electrode can inhibit the water permeation of the proton exchange membrane, enhance the splashing effect from the cathode to the anode, and improve the gas diffusion mass propagation speed.

Description

Technical field [0001] The invention involves a fuel cell and its preparation method, which specifically involves a membrane electrode and its preparation method that can improve the performance of miniature direct methanol fuel cells. Background technique [0002] The fuel cell technology is considered to be the clean and efficient power generation technology preferred in the 21st century, and will be widely used in the fields of aerospace, military, energy, communications and transportation.Direct methanol fuel cells are a type of fuel cell. It has the advantages of high energy density, high sources of methanol, low price, low price, easy -to -store and carrying, high system structure, simple system structure, no fuel reorganization and purification, and easy operating conditions.In recent years, many internationally renowned companies have conducted a wide range of research and have demonstrated their respective prototypes to make UDMFC (miniature direct methanol fuel cells) t...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/1004H01M8/1011
CPCY02E60/50
Inventor 张雪林张宇峰陈海龙李洋刘晓为
Owner INFORMATION SCI RES INST OF CETC
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