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Porous carbon fiber used for proton exchange membrane fuel cell and preparation method thereof

A porous carbon fiber and fuel cell technology, applied to fuel cell parts, fuel cells, circuits, etc., can solve the problems of catalyst poisoning, high production cost, and difficulty in hydrogen storage, and achieve controllable preparation and reduce mass transfer resistance Effect

Inactive Publication Date: 2017-03-29
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the proton exchange membrane fuel cell has the following problems in its commercialization road: high production cost, catalyst poisoning, difficulty in hydrogen storage, and flooded electrodes prevent the reaction gas from entering, etc.
Conventional carbon paper or carbon cloth needs to undergo hydrophobic treatment to reduce water flooding in the gas diffusion layer, but after hydrophobic treatment, the pore size of carbon paper or carbon cloth will decrease, which increases the resistance of oxygen transmission to a certain extent
In addition, in order to reduce the loss of catalyst during the spraying process and strengthen water management, the surface of conventional carbon paper or carbon cloth is also coated with a microporous layer formed by carbon powder and polytetrafluoroethylene (PTFE) (the average pore size is about 1 μm), which increases the manufacturing process and cost of the gas diffusion layer to a certain extent

Method used

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  • Porous carbon fiber used for proton exchange membrane fuel cell and preparation method thereof
  • Porous carbon fiber used for proton exchange membrane fuel cell and preparation method thereof
  • Porous carbon fiber used for proton exchange membrane fuel cell and preparation method thereof

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preparation example Construction

[0028] The embodiment of the present invention provides a kind of preparation method of porous carbon fiber, comprises the following steps:

[0029] Perform high-voltage electrospinning treatment on polyacrylonitrile / polylactic acid (PAN / PLA) mixed solution to obtain spun fibers;

[0030] placing the spun fiber in chloroform for ultrasonic solvent extraction;

[0031] The spun fibers subjected to ultrasonic solvent extraction are subjected to heat treatment to obtain porous carbon fibers.

[0032] The preparation method of the porous carbon fiber provided by the embodiment of the present invention uses the mixed liquid of polyacrylonitrile and polylactic acid as the spinning liquid to carry out the electrospinning treatment, and uses the action of the electrostatic field to load a high-voltage power supply on the spinning liquid to make the spinning The molecules of the liquid have a certain density of static electricity. When the electrostatic repulsion is sufficient, the so...

Embodiment 1

[0053] Processing technology of spun fiber:

[0054] Prepare PAN solution: take 0.189g PAN in a 25mL small beaker, add 1.911g DMF, place on a magnetic stirrer and stir for 24h; prepare PLA solution: take 0.045g PLA in a 25mL small beaker, add 0.855g DMF, place Stir on a magnetic stirrer for 24 hours; then mix PAN / PLA=70:30, place on a magnetic stirrer and stir for 12 hours to obtain a clear and transparent spinning solution. Paste the aluminum foil on the collecting drum, then pour the spinning mixture into a 2.5mL syringe, assemble the spinning tool, adjust the flow rate to 1-3mL / h, the spinning distance to 12cm, and the spinning voltage (negative pressure -2KV, positive pressure 8KV, and the voltage difference is 10KV) for spinning.

[0055] Chloroform solvent sonication of spun fibers:

[0056] The spun fiber is placed in a 250mL beaker, poured into 20-40mL of chloroform, and the chloroform is ultrasonically extracted for 20min at an ultrasonic frequency of 8Hz. Under ul...

Embodiment 2

[0063] The processing technology of spinning fiber is:

[0064] Prepare PAN solution: take 0.189g PAN in a 25mL small beaker, add 1.911g DMF, place on a magnetic stirrer and stir for 24h; prepare PLA solution: take 0.045g PLA in a 25mL small beaker, add 0.855g DMF, place Stir on a magnetic stirrer for 24 hours; then mix PAN / PLA=70:30, place on a magnetic stirrer and stir for 12 hours to obtain a clear and transparent spinning solution. Paste the aluminum foil on the collecting drum, then pour the spinning mixture into a 2.5mL syringe, assemble the spinning tool, adjust the flow rate to 1-3mL / h, the spinning distance to 12cm, and the spinning voltage (negative pressure -2KV, positive pressure 10KV, and the voltage difference is 12KV) for spinning.

[0065] Chloroform solvent sonication of spun fibers:

[0066] The spun fiber is placed in a 250mL beaker, poured into 20-40mL of chloroform, and the chloroform is ultrasonically extracted for 20min at an ultrasonic frequency of 8H...

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Abstract

The invention is applicable to the field of electrochemistry power sources, and provides a porous carbon fiber used applicable to proton exchange membrane fuel cell and a preparation method thereof. The preparation method comprises the steps of conducting high-voltage electrostatic spinning processing on PAN / PLA mixed liquor to obtain a spinning fiber; putting the spinning fiber into chloroform and carrying out ultrasonic solvent extraction processing; conducting heat treatment on the spinning fiber after ultrasonic solvent extraction processing to obtain the porous carbon fiber. The preparation method for the porous carbon fiber has the advantages of being fast, simple, low in cost, controllable over diameter and the like. The porous carbon fiber used for proton exchange membrane fuel cell can be directly used as a gas diffusion layer, does not need extra hydrophobic treatment and micropore player coating, and facilitates the reduction of the mass transfer resistance of gases and the manufacturing cost of gas diffusion layers.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, and in particular relates to a porous carbon fiber used in a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Among many renewable and clean energy technologies, proton exchange membrane fuel cells have attracted extensive attention from companies and research institutions around the world in recent years because of their advantages of high energy conversion efficiency and zero pollution emissions. The core part of the proton exchange membrane fuel cell system is the membrane electrode (MEA). The membrane needs water to maintain high proton conductivity to ensure high enough cell performance. However, too much water in the electrode may cause the electrode to flood, preventing the electrode Chemical reactions occur, reducing performance, so proper water balance needs to be maintained. The gas diffusion layer in contact with the catalyst is o...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/023
CPCH01M8/0234Y02E60/50Y02P70/50
Inventor 吴其兴黄雨欣朱晓琳梅日国王芳罗仲宽
Owner SHENZHEN UNIV
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