Electrospinning and electrostatic spraying method for membrane electrode CCM

An electrostatic spraying and electrospinning technology is applied in the fields of electrospinning and electrostatic spraying preparation. The effect of increasing the three-phase reaction interface and improving the utilization rate of the catalyst

Pending Publication Date: 2017-06-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of the membrane electrode CCM prepared by these methods are that the platinum catalyst has a high loading capacity, the cost cannot be reduced, the catalyst utilization efficiency is low, the catalyst layer is not ordered, resulting in large mass transfer resistance, and the lack of an effective three-phase reaction interface ( Wang Cheng, Zhao Bo, Zhang Jianbo. Key Technologies of Membrane Electrodes for Proton Exchange Membrane Fuel Cells[J]. Science and Technology Herald, 2016,34(6):62-68)

Method used

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  • Electrospinning and electrostatic spraying method for membrane electrode CCM
  • Electrospinning and electrostatic spraying method for membrane electrode CCM
  • Electrospinning and electrostatic spraying method for membrane electrode CCM

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 4g 5wt% Nafion solution, 0.05g polyacrylic acid, 0.95g isopropanol and water mixed solution, wherein, the volume ratio of isopropanol and water is 3:1, after mixing, stir magnetically for 8h to obtain a concentration of 5wt%, fully Mixed electrospinning solution. Install aluminum foil on the electrospinning collection drum and ground it. Use a 5mL syringe to take 3mL of the electrospinning solution, install the syringe on a micro-injection pump, and connect the needle of the syringe to the positive electrode of the high voltage source. Adjust the advancing speed of the syringe pump to 0.1mL / h, and turn on the high-voltage power supply and the roller when droplets appear on the needle. The working voltage was adjusted to 12KV, the drum speed was 100rpm, and the electrospinning time was 30min to obtain polymer nanofibers. The measured average diameter of the polymer nanofiber is 250nm, the thickness is 6μm, and the porosity is greater than 70%.

[0033] Cut polym...

Embodiment 2

[0039]Weigh 4g of 5wt% Nafion solution, 0.01g of polyacrylic acid, 2.2g of isopropanol and water mixed solution, wherein, the volume ratio of isopropanol to water is 3:1, after mixing, stir magnetically for 8h to obtain a concentration of 3.4wt%. Thoroughly mix the electrospinning solution. Install aluminum foil on the electrospinning collection drum and ground it. Use a 5mL syringe to take 3mL of the electrospinning solution, install the syringe on a micro-injection pump, and connect the needle of the syringe to the positive electrode of the high voltage source. Adjust the advancing speed of the syringe pump to 0.5mL / h, and turn on the high-voltage power supply and the roller when droplets appear on the needle. The working voltage was adjusted to 12KV, the drum speed was 50rpm, and the electrospinning time was 20min to obtain polymer nanofibers. The measured average diameter of the polymer nanofiber is 160nm, the thickness is 4μm, and the porosity is greater than 70%.

[0...

Embodiment 3

[0044] According to example 2 steps

[0045] Take 10mg of Pt / C catalyst (40wt%Pt), 0.5mg of Nafion, 2.5g of isopropanol and water mixed solution, wherein, the volume ratio of isopropanol to water is 3:1, mix and ultrasonically disperse for 3min to obtain a concentration of 5.7wt %, mix a homogeneous solution. Then replace the electrospinning collection drum with an aluminum plate of an appropriate size, and place the above-mentioned composite film on the aluminum plate. Use a 5ml syringe to take 2mL of the catalyst solution, adjust the distance between the needle aluminum plate to 5cm, the working voltage to 4.5KV, and spray for 20min. Obtain this surface as a membrane electrode anode with a platinum loading of 0.06 mg / cm 2 .Spray on the other side of the membrane for 30 minutes in the same way, as the cathode of the membrane electrode, with a platinum loading of 0.09mg / cm 2 .CCM preparation ends.

[0046] The CCM and SGL carbon paper were hot-pressed to form a film electr...

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Abstract

The present invention discloses an electrospinning and electrostatic spraying method for a membrane electrode CCM. According to the present invention, the catalyst layer having the nanometer film structure is obtained by using the electrospinning and electrostatic spraying method, wherein the catalyst layer structure has a high specific surface area so as to increase the three-phase reaction interface, increase the active area of the catalytic layer, and improve the catalyst utilization rate; the polymer nano-fiber membrane has high porosity, such that the mass transfer is easily performed, and the concentration polarization is effectively reduced; and the nano-scale catalytic particles obtained through electrostatic spraying are uniformly distributed on the nano-fiber structure so as to reduce the platinum loading and improve the catalytic performance.

Description

technical field [0001] The invention relates to an electrospinning and electrostatic spraying preparation method of a membrane electrode CCM. Background technique [0002] The fuel cell is highly efficient and environmentally friendly, and can directly convert the chemical energy of the fuel into electrical energy, and there is no heat engine work in the conversion process, and there is no limitation of the Carnot cycle, so the energy conversion efficiency is high (40% to 60%). Among them, the proton exchange membrane fuel cell (PEMFC) is a zero-emission, high-efficiency and high-power-density power generation device, especially in the application of new energy transportation power, which has an extremely attractive prospect. The membrane electrode (membrane electrode assembly, MEA) is a heterogeneous material transport and electrochemical reaction site, which determines the performance, life and cost of PEMFC. MEA is a five-in-one component composed of a membrane / catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/88B05D1/04D04H1/4282D04H1/728
CPCH01M4/881H01M4/8828H01M8/1004D04H1/4282D04H1/728B05D1/04Y02E60/50
Inventor 顾军孟贵平杨德龙张严苏明星
Owner NANJING UNIV
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