Fuel cell ordered porous nano-fiber single electrode, membrane electrode and preparation method

A nanofiber, fuel cell technology, applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., to achieve the effects of being beneficial to the three-phase interface reaction and particle mass transfer, increasing the catalytic active area, and improving the corrosion resistance.

Inactive Publication Date: 2013-11-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Mu Shichun et al. (Chinese invention patent, application number 201310041096.1) further reported a fuel cell non-precious metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 0.55g of dried polyvinylidene fluoride (PVDF) powder, 2.4g of dimethyl diamide (DMF), and 1.6g of acetone, mix them in a beaker, stir at 50°C for 0.5h with a magnetic stirrer, and prepare Mix the electrospinning polymer liquid well. Fix the gas diffusion layer material on the receiving plate of the electrospinning device, and use polytetrafluoroethylene-treated hydrophobic carbon paper: immerse the carbon paper in the polytetrafluoroethylene hydrophobic agent for 10 minutes, and heat it at 350 ° C. Calcining at lower temperature for 30 minutes, wherein the solid content of polytetrafluoroethylene hydrophobic agent is 10wt%-30wt%. Use a syringe with a specification of 5ml or 10ml to take 2ml of the electrospinning polymer liquid and fix it on the micro-injection pump. The needle port of the syringe is ground into a flat mouth and connected to the output port of the high voltage power supply. Fix hydrophobic carbon paper on grounded aluminum foil as a receiving sc...

Embodiment 2

[0053]Weigh 0.65g of dried PVDF powder, 2.8g of dimethyl diamide (DMF), and 1.8g of acetone, mix them in a beaker, stir at 50°C for 0.5h with a magnetic stirrer, and make a uniformly mixed electrospun The polymer liquid is electrospun on one side of the hydrophobic carbon paper, and the other specific operations are the same as in Example 1. The working voltage is adjusted to 15kv, and the electrospinning time is 15-16 minutes to obtain a porous polymer nanofiber electrospun membrane. The hydrophobic carbon paper adhered with the porous polymer nanofiber electrospun membrane was placed in a vacuum drying oven, kept at a temperature of 60° C., and the solvent was evaporated to obtain a porous polymer nanofiber film. The diameter of the porous polymer nanofiber is about 200 nm, and the film thickness is about 8 μm. The porosity of the porous nanofiber membrane is greater than 90%.

[0054] Put the platinum metal target into the magnetron sputtering apparatus, and the other spe...

Embodiment 3

[0063] Weigh 0.75g of dried PVDF powder, 3.0g of dimethyldiamide (DMF), and 2.0g of acetone, mix them in a beaker, stir them at 50°C for 0.5h with a magnetic stirrer, and make a uniformly mixed electrospun The polymer liquid is electrospun on one side of the hydrophobic carbon paper, and the other specific operations are the same as in Example 1. The working voltage was adjusted to 13 kv, and the electrospinning time was 20 minutes to obtain a porous polymer nanofiber electrospun membrane. The carbon paper deposited with the porous polymer nanofiber electrospun membrane was placed in a vacuum drying oven, kept at a temperature of 60° C. to dry, and the solvent was evaporated to obtain a porous polymer nanofiber film. The diameter of the nanofiber is about 200 nm, and the film thickness is 10 μm. The porosity of the porous polymer nanofiber membrane is greater than 80%.

[0064] Put the platinum metal target into the magnetron sputtering apparatus, and the other specific oper...

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Abstract

The invention discloses a fuel cell ordered porous nano-fiber single electrode, a membrane electrode and a preparation method. Polymer nano-fibers are deposited on one side of a gaseous diffusion material through an electro-spinning technology; metal nanoparticles with catalytic activity are deposited on the surfaces of the polymer nano-fibers by using magnetron sputtering and vacuum evaporation methods, or catalyst slurry is directly sprayed to one side of a nano-fiber thin film to form a porous single electrode; then two single electrodes and a layer of proton exchange membrane are combined into a three-in-one membrane electrode. The fuel cell ordered porous nano-fiber single electrode, the membrane electrode and the preparation method have the beneficial effects that the conventional micro-porous layer is substituted by the nano-fiber layer with high porosity and high specific surface area, prepared by electro-spinning, so that the catalytic activity area is increased and the three-phase reaction interface and the mass transfer are facilitated, and an active metal catalytic layer formed by magnetron sputtering and vacuum evaporation has high adhesion, is uniform in coating and has controllable thickness, so that the using amount of the active metal catalyst is reduced and the utilization rate of the catalyst is also greatly increased.

Description

technical field [0001] The invention relates to a fuel cell ordered porous nanofiber single electrode, a membrane electrode and a preparation method. Background technique [0002] A fuel cell is a (H 2 , Methanol, etc.) fuel and oxidant chemical energy directly into electrical energy conversion device, its energy conversion efficiency is high, less environmental pollution, reliability and maintenance, and many other advantages, known as following the water, fire and nuclear power after The fourth-generation power generation device is a new type of energy that is most in line with sustainable development. Proton exchange membrane fuel cell (PEMFC) is one of the most widely applicable and most promising. Membrane electrode is the core component of proton exchange membrane fuel cell. It is composed of proton exchange membrane, catalytic layer and gas diffusion layer. It plays a role in catalyzing bipolar reactions and conducting protons and electrons in PEMFC, which is very c...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02B82Y30/00H01M8/1004
CPCY02E60/50
Inventor 木士春张建苏昊张潇龚雪姜玉林陈旭潘牧
Owner WUHAN UNIV OF TECH
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