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Fuel-cell catalyst using complex carbon material as carrier and preparation method thereof

A fuel cell and composite carbon technology, which is used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. will be very high and other problems, to achieve the effect of increasing mutual contact, improving utilization, and slowing down reunion

Inactive Publication Date: 2010-12-15
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, people generally use carbon black as a catalyst carrier. This is because carbon black has a high specific surface area, good electrical conductivity and a good pore structure, which is conducive to improving the dispersion of metal platinum particles, but the utilization rate of platinum is still low. An important reason is that a large number of platinum or platinum alloy particles enter the micropores on the carbon surface. Since this part of the buried platinum or platinum alloy cannot be in contact with the proton conductor, it is difficult to form more three-phase reactions. interface, thereby reducing the utilization of platinum
In addition, since platinum or platinum alloy is directly connected with carbon, the proton exchange resin cannot enter the position between platinum or platinum alloy and carbon during the preparation of membrane electrodes, which reduces the three-phase reaction area on the one hand, and on the other hand During the working process of the battery, due to the poisoning of CO, the activity of platinum or platinum alloy is weakened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of composite carbon material is the preparation method of the fuel cell catalyst of carrier, and this preparation method comprises the steps:

[0018] Step 1, the granular carbon material C1 is the pretreatment of carbon black (ValcanXC-72):

[0019] The granular carbon material ValcanXC-72 was refluxed in acetone for 0.5h, then filtered, washed and dried, soaked in 2mol / L nitric acid for 24h, then washed with deionized water until neutral, and then refluxed with 5% hydrogen peroxide for 2h , filtered, washed, dried and ground for later use.

[0020] Pretreatment of the linear carbon material C2 as carbon nanotubes (CNTS):

[0021] Soak CNTS in concentrated nitric acid at room temperature, stir for 12 hours, then reflux at 80°C for 2 hours, then cool the mixture naturally, filter, dry in vacuum for 12 hours, and grind for later use.

[0022] Step 2: Mix 230 mg of ValcanXC-7 and 30 mg of CNTS processed in step 1 according to the mass ratio of 1:1, add it to a 15...

Embodiment 2

[0025] A kind of composite carbon material is the preparation method of the fuel cell catalyst of carrier, and this preparation method comprises the steps:

[0026] Step 1, pretreatment of granular carbon material C1 as carbon microspheres:

[0027] The carbon microspheres were refluxed in acetone for 0.5h, then filtered, washed and dried, soaked in 2mol / L nitric acid for 24h, then washed with deionized water until neutral, then refluxed with 5% hydrogen peroxide for 2h, filtered, Wash, dry and grind for later use.

[0028] Pretreatment of linear carbon material C2 as carbon fiber:

[0029] Soak the carbon fibers in concentrated nitric acid at room temperature, stir for 12 hours, then reflux at 80°C for 2 hours, then cool the mixture naturally, filter, vacuum dry for 12 hours, and grind for later use.

[0030] Step 2, mix 100 mg of carbon microspheres treated in step 1 with 1 mg of carbon fiber at a mass ratio of 10:1, add to a 150 ml three-necked flask, add isopropanol: wat...

Embodiment 3

[0033] A kind of composite carbon material is the preparation method of the fuel cell catalyst of carrier, and this preparation method comprises the steps:

[0034] Step 1, pretreatment of the granular carbon material C1 as mesoporous carbon:

[0035] The mesoporous carbon was refluxed in acetone for 0.5h, then filtered, washed and dried, soaked in 2mol / L nitric acid for 24h, then washed with deionized water until neutral, then refluxed with 5% hydrogen peroxide for 2h, filtered, Wash, dry and grind for later use.

[0036] Pretreatment of the linear carbon material C2 as carbon nanotubes (CNTS):

[0037] Soak CNTS in concentrated nitric acid at room temperature, stir for 12 hours, then reflux at 80°C for 2 hours, then cool the mixture naturally, filter, vacuum-dry for 12 hours, and grind for later use.

[0038] Step 2: Take 50 mg of mesoporous carbon treated in step 1 and 10 mg of CNTS in a mass ratio of 5:1 and mix them, add them to a 150 ml three-necked flask, add 40 ml of...

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PUM

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Abstract

The invention relates to a fuel-cell catalyst and a preparation method thereof, in particular to a fuel-cell catalyst using a complex carbon material as a carrier and a preparation method thereof. The catalyst is expressed as Pt / (C1+C2), and the carbon carrier is a mixture of a granular carbon material (C1) and a linear carbon material (C2). By using the mixture of the granular carbon material (C1) and the linear carbon material (C2) as the carbon basis materials, the invention prepares the Pt / (C1+C2) catalyst from the two basis materials by an in-situ chemical reduction method. The granular carbon material comprises carbon black, carbon microspheres or mesoporous carbon. The linear carbon material comprises carbon fibers or carbon nano tubes. The combination of the linear carbon material and the granular carbon material forms a three-dimensional complex network structure, thereby enlarging the three-phase reaction active region of the catalyst and improving the utilization ratio of platinum.

Description

technical field [0001] The invention relates to a fuel cell catalyst and a preparation method. Background technique [0002] Fuel cells, characterized by low operating temperature, high energy efficiency, and no electrolyte corrosion, are a research hotspot in the field of electrochemistry and energy science. Catalyst development is one of the most challenging tasks in proton exchange membrane fuel cell research. A large number of studies have proved that Pt-based catalysts exhibit good electrocatalytic performance as cathode and anode catalysts for fuel cells. However, the price and shortage of platinum metal limit the application of Pt-based catalysts. Therefore, reducing the amount of noble metal catalysts used is one of the key factors to effectively reduce the production cost of fuel cells. The solution is to have catalysts with high dispersion and high efficiency by using appropriate support materials. [0003] At present, people generally use carbon black as a cata...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B01J23/42B01J37/16
CPCY02E60/50
Inventor 康晓红江红朱红黄兆丰魏小岗
Owner BEIJING JIAOTONG UNIV
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