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Fuel cell chip with nano structure film catalyst layer, film electrode and preparation method thereof

A technology of fuel cells and nanostructures, applied in battery electrodes, nanotechnology, nanotechnology, etc., to achieve the effects of ensuring catalytic efficiency, shortening particle transmission distance, and improving utilization

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 ordered membrane electrode with a nano-sandwich structure, but the catalytic activity of the non-Pt catalyst needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 0.55g of dried polyvinylidene fluoride (PVDF) powder, 2.4g of dimethyl diamide (DMF), and 3.2g 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 proton exchange membrane on the receiving plate of the electrospinning device, take 2ml of the electrospinning polymer liquid with a syringe with a specification of 5ml or 10ml, and fix it on the micro-syringe 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. The long-chain Nafion211 proton exchange membrane of DuPont Company of the United States was fixed on the grounded aluminum foil as the receiving screen. Start the syringe pump, adjust the advancing speed of the syringe, and when there are liquid droplets on the needle, turn on the high-voltage power supply, adjust the working voltage to 15kv, and set the distance of the receiving screen to ...

Embodiment 2

[0049]Weigh 0.90g of dried PVDF powder, 3.8g of dimethyl diamide (DMF), and 5.2g of acetone, mix them in a beaker, stir at 50°C for 0.5h with a magnetic stirrer, and make a uniformly mixed electrospinning polymer liquid. Fix the long-chain Nafion proton exchange membrane on a grounded aluminum foil as a receiving screen, adjust the appropriate receiving distance, and the rest of the specific operations are the same as in Example 1. The electrospinning time is 10min, and the porous polymer nanofiber electrospun membrane is obtained. In the same way, the porous polymer nanofiber electrospun membrane is deposited on the other side of the long-chain Nafion211 proton exchange membrane, and placed in an oven at 100-120°C. A proton exchange membrane with a porous polymer nanofibrous membrane on both sides is obtained. The diameter of the polymer nanofibers on both sides of the Nafion211 proton exchange membrane is about 120nm, the membrane thickness is 8μm, and the porosity of the p...

Embodiment 3

[0056] Weigh 0.50g of polystyrene powder, 3ml of chloroform, and 1ml of tetrahydrofuran into a beaker, stir in a water bath at 90°C with a magnetic stirrer until all the polystyrene is dissolved, and prepare a homogeneously mixed electrospinning polymer liquid. Fix the porous polytetrafluoroethylene reinforced composite membrane filled with Nafion solution on the receiving screen, adjust the appropriate receiving distance, and the rest of the operations are the same as in Example 1. The electrospinning time was 3min, and the porous polymer nanofiber electrospun membrane was obtained. In the same way, the porous polytetrafluoroethylene reinforced composite membrane filled with Nafion solution was deposited on the other side of the porous polymer nanofiber electrospun membrane. In an oven at 120° C., a proton exchange membrane with porous polymer nanofiber membranes on both sides was obtained. The polymer nanofibers on both sides of the reinforced composite membrane have a diame...

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Abstract

The invention relates to a fuel cell chip with a nano structure film catalyst layer, a film electrode and a preparation method thereof. Polymer nanometer fibers are deposited at both sides of a proton exchange membrane through an electrostatic spinning technology so as to form a porous polymerization nanofiber film is formed, and then a CCM (Coincident-Current Memory) is formed through depositing reactive metal catalysts on the polymer nanfiber by using a magnetron sputtering method, a vacuum evaporation method or a spraying method, then a gas diffusion layer material is stuck to both sides of the CCM to form a five-in-one film electrode by virtue of hot compression. The preparation method provided by the invention has the beneficial effects that a conventional micro-porous layer can be replaced by a nanofiber prepared through electrostatic spinning, and furthermore a nano structure with high porosity and high specific surface area can be used for increasing the catalytic activity area and is beneficial to a triphase reaction interface and mass transfer; the adhesiveness of the reactive metal catalyst layer obtained by magnetron sputtering and vacuum evaporation is good, a cladding is uniform, the thickness is controllable, and both the utilization ratio of a catalyst and the stability of the film electrode are improved.

Description

technical field [0001] The invention relates to a fuel cell chip, a membrane electrode and a preparation method with a nanostructure thin film catalyst layer. Background technique [0002] A fuel cell is a (H 2 , Methanol, etc.) fuel and oxidant chemical energy directly converted into electrical energy conversion device, its energy conversion efficiency is high, less environmental pollution, quiet, reliable and maintainable and many other advantages, known as the successor of water power, fire power and nuclear power The fourth-generation power generation device that follows is the new type of energy that is most in line with sustainable development. Proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC) is one of the most widely applicable and most promising. Among them, the membrane / catalyst three-in-one component (CCM, catalyst coated membrane) is the core component of PEMFC. Since all the electrochemical reactions of the fuel cell are completed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/88B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 木士春张建苏昊陈旭张潇龚雪
Owner WUHAN UNIV OF TECH
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