Porous metal-ceramic composite material gas spreading layer used for hydrogen fuel cell and preparation method thereof

A gas diffusion layer and fuel cell technology, which is applied to fuel cell parts, battery electrodes, circuits, etc., can solve the problems of reducing gas mass transfer, affecting gas distribution, and reducing fuel cell performance, achieving uniform and effective diffusion, improving The effect of operating efficiency and excellent mechanical strength

Active Publication Date: 2012-12-05
北京开元新能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, in the optimization process of hydrogen fuel cells, thin-layer metal bipolar plates are an important development direction for reducing battery volume, increasing power density, and reducing production costs. Slightly oxidized metal) Excessive contact resistance increases the internal resistance of the fuel cell during operation and reduces the performance of the fuel cell
In addition, in order to reduce the contact resistance between the layers in the battery, a huge pressure must be applied during the use of the battery. The pores in the carbon-based gas diffusion layer are deformed under the pressure, resulting in a decrease in the porosity of the material, thereby reducing the gas transmission. quality and affects the gas distribution, thereby affecting the fuel cell operating performance

Method used

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  • Porous metal-ceramic composite material gas spreading layer used for hydrogen fuel cell and preparation method thereof
  • Porous metal-ceramic composite material gas spreading layer used for hydrogen fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw materials: titanium powder, 500 mesh, purity > 99% Ti; ammonium bicarbonate powder, purity > 99%.

[0025] 1. Roughly grind the ammonium bicarbonate powder with a mortar, and process the ground powder with an ultrafine pulverizer. The obtained powder should be a 400-mesh micropowder.

[0026] 2. Mix titanium powder and ammonium bicarbonate micropowder according to the predetermined weight ratio, 2 kg of titanium powder and 500 g of ammonium bicarbonate powder in a three-dimensional mixer, and the mixing time is 30-45 minutes.

[0027] 3. Pass the mixed powder of the obtained titanium powder and ammonium bicarbonate micropowder through a 60-mesh sieve to remove agglomerates.

[0028] 4. Using a powder rolling mill, adjust the distance between the rolls, and roll the sieved powder into a billet strip with a predetermined thickness of 1 mm. The transverse thickness difference is less than 0.05 mm within 20 cm, and the longitudinal thickness difference is no more t...

Embodiment 2

[0036] Raw materials: titanium powder, 500 mesh, purity > 99%; aluminum powder, 500 mesh, purity > 99%, ammonium bicarbonate powder, purity > 99%.

[0037] 1. Roughly grind the ammonium bicarbonate powder with a mortar, and process the ground powder with an ultrafine pulverizer. The obtained powder should be a 400-mesh micropowder.

[0038] 2. Mix titanium powder and ammonium bicarbonate powder according to the predetermined weight ratio, 2 kg of titanium powder, 50 grams of aluminum powder, and 800 grams of ammonium bicarbonate powder in a three-dimensional mixer, and the mixing time is 30-45 minutes.

[0039] 3. Pass the mixed powder of the obtained titanium powder and ammonium bicarbonate micropowder through a 60-mesh sieve to remove agglomerates.

[0040] 4. Use the powder rolling mill to adjust the distance between the rolls, and roll the sieved powder into a billet strip with a predetermined thickness of 0.5 mm. The transverse thickness difference is less than 0.03 mm...

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Abstract

The invention describes novel gas spreading base material which uses titanium and an alloy thereof as the basic raw material and a metal-ceramic composite material porous thin strip made by a powder metallurgy processing technique and a thermal treatment surface layer material ceramic technique as a hydrogen fuel cell. The gas spreading layer of the composite material has good mechanical strength and can provide a stable structural support for a membrane electrode (MEA). By adopting the gas spreading layer of the composite material, a low-resistance contact between a catalyst electrode and a dual-polar plate is realized, so that the resistance in the cell is lowered, the current conducting efficiency is improved, and the running efficiency of the hydrogen fuel cell is improved.

Description

technical field [0001] The invention relates to a gas diffusion layer of a hydrogen fuel cell, which is a thin porous metal-ceramic composite material. In particular, it provides powder metallurgy forming and heat treatment processing preparation technology for manufacturing the high-porosity metal-ceramic composite material. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. It is a new technology that uses energy efficiently without polluting the environment. Among them, the proton exchange membrane fuel cell has become a research hotspot in various countries because of its huge potential application in the fields of transportation and backup power. [0003] The core component of a proton exchange membrane fuel cell is the membrane electrode assembly (MEA). MEA usually consists of a proton exchange membrane, a catalyst, and a gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88
CPCY02E60/50
Inventor 段润润
Owner 北京开元新能科技有限公司
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