Preparation method of gas diffusion layer of fuel cell
A gas diffusion layer, fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficulty, poor hydrophobicity and poor conductivity of the gas diffusion layer
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[0033] One embodiment of the present invention discloses a method for preparing a fuel cell gas diffusion layer, such as figure 1 Shown, this preparation method comprises the following steps:
[0034] Step 1. Hydrophobic treatment of the support layer: immerse the support layer in a water-repellent solution, take it out and dry it, and perform heat treatment in stages; wherein, the immersion time of the support layer can be adjusted according to needs, for example, the immersion time is 1-2min. The support layer after the hydrophobic treatment can be heat-treated in sections through a tube furnace, a roasting furnace or a muffle furnace.
[0035] Step 2, prepare the microporous layer slurry: uniformly mix the conductive material, two-dimensional MXene sheet material, hydrophobic agent and organic solvent to make a uniform microporous layer slurry; the mixing method can be mechanical stirring or ultrasonic dispersion .
[0036] Step 3, preparing the gas diffusion layer: repea...
Embodiment 1
[0054] Hydrophobic treatment of the support layer: immerse the carbon paper (support layer) in 5wt% PTFE (polytetrafluoroethylene) emulsion (hydrophobic agent solution) for 1-2min, take it out and put it in an oven for drying at 30°C, repeat Dip-dry the carbon paper so that the PTFE content on the carbon paper is 10 wt%. Put the dried carbon paper into the roasting furnace, raise the temperature to 250°C, and bake for 30 minutes to remove the surfactant in the PTFE emulsion; then raise the furnace temperature to 350°C, and continue to bake for 30 minutes to melt the PTFE to form a PTFE film covering On the carbon fiber surface of the carbon paper, the hydrophobization of the carbon paper is realized. Hydrophobicity test was carried out, and the test results were as follows Figure 4 As shown, the test contact angle was 131.4° (122° before treatment). Among them, the larger the contact angle, the better the hydrophobicity.
[0055] Preparation of microporous layer slurry: Vu...
Embodiment 2
[0058] Hydrophobic treatment of the support layer: immerse the carbon paper (support layer) in 5wt% PTFE emulsion (hydrophobic agent solution) for 1-2min, take it out and put it in an oven for drying treatment at 30°C, repeat the dipping-drying treatment of the carbon paper , so that the PTFE content on the carbon paper is 20wt%. Put the dried carbon paper into the roasting furnace, raise the temperature to 250°C, and bake for 30 minutes to remove the surfactant in the PTFE emulsion; then raise the furnace temperature to 350°C, and continue to bake for 30 minutes to melt the PTFE to form a PTFE film covering On the carbon fiber surface of the carbon paper, the hydrophobization of the carbon paper is realized. Hydrophobicity test was carried out, and the test results were as follows Figure 4 As shown, the tested contact angle is 136.7° (122° before treatment).
[0059] Preparation of microporous layer slurry: Vulcan XC-72 carbon black powder 700mg, 10wt% PTFE emulsion 3g and...
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