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 condu

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0016] Example 1

[0017] A preparation method of a fuel cell catalyst with a composite carbon material as a carrier, the preparation method comprising the steps of:

[0018] Step 1, the pretreatment of the granular carbon material C1 as 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 , filtration, washing, drying, grinding for use.

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

[0021] The CNTS was soaked in concentrated nitric acid at room temperature, stirred for 12 hours, and then refluxed at 80 °C for 2 hours. Then the mixture was cooled naturally, filtered, dried in vacuum for 12 hours, and ground for use.

[0022] Step 2, get the ValcanXC-7230mg and CNTS 30mg that step 1 handles by mass ratio of 1: 1 and...

Example Embodiment

[0024] Embodiment 2

[0025] A preparation method of a fuel cell catalyst with a composite carbon material as a carrier, the preparation method comprising the steps of:

[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, and then refluxed with 5% hydrogen peroxide for 2h, filtered, Wash, dry and grind for later use.

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

[0029] The carbon fiber was soaked in concentrated nitric acid at room temperature, stirred for 12 hours, and then refluxed at 80 °C for 2 hours, then the mixture was cooled naturally, filtered, vacuum-dried for 12 hours, and ground for use.

[0030] In step 2, 100 mg of carbon microspheres and 1 mg of carbon fibers processed in step 1 were mixed according to the mass ratio of...

Example Embodiment

[0032] Embodiment 3

[0033] A preparation method of a fuel cell catalyst with a composite carbon material as a carrier, the preparation method comprising the steps of:

[0034] Step 1, pretreatment of 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, and then refluxed with 5% hydrogen peroxide for 2h, filtered, Wash, dry and grind for later use.

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

[0037] The CNTS was soaked in concentrated nitric acid at room temperature, stirred for 12 hours, and then refluxed at 80 °C for 2 hours, then the mixture was cooled naturally, filtered, vacuum dried for 12 hours, and ground for use.

[0038] In step 2, 50 mg of mesoporous carbon and 10 mg of CNTS treated in step 1 were mixed at a mass ratio of 5: 1, added to a 150 ml th...

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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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