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Fuel cell catalyst taking multi-element compound as carrier and preparation method thereof

A fuel cell, composite technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult to form three-phase reaction interface, platinum or platinum alloy The activity is weakened and the utilization rate of platinum will not be very high, so as to increase the anti-CO poisoning, increase mutual contact, and improve the utilization rate.

Inactive Publication Date: 2012-10-31
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

[0022] A kind of preparation method of the fuel cell catalyst that multi-element compound is carrier, this preparation method comprises the following steps:

[0023] Step 1, the granular carbon material C1 is the pretreatment of carbon black (ValcanXC-72):

[0024] 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.

[0025] Pretreatment of the linear carbon material C2 as carbon nanotubes (CNTS):

[0026] 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.

[0027] Step 2, preparing SnCl with a molar concentration of 0.01mol / L 2 solution;

[0028] Step 3, take the ValcanXC-7 230mg and...

Embodiment 2

[0033] A kind of preparation method of the fuel cell catalyst that multi-element compound is carrier, this preparation method comprises the steps:

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

[0035] 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.

[0036] Pretreatment of linear carbon material C2 as carbon fiber:

[0037] 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.

[0038] Step 2, the preparation molar concentration is 0.1mol / L (NH 4 ) 2 Ce(NO 3 ) 6 solution;

[0039] Step 3, mix 100 mg of carbon microspheres and 1 mg of carbon fiber treated...

Embodiment 3

[0044] A kind of preparation method of the fuel cell catalyst that multi-element compound is carrier, this preparation method comprises the steps:

[0045] Step 1, pretreatment of the granular carbon material C1 as mesoporous carbon:

[0046] 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.

[0047] Pretreatment of the linear carbon material C2 as carbon nanotubes (CNTS):

[0048]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.

[0049] Step 2, the preparation molar concentration is 0.05mol / L Ni(NO 3 ) 2 solution;

[0050] Step 3: Take 50 mg of mesoporous carbon treated in step 1 and 10 mg of CNTS in a mass...

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Abstract

The invention discloses a fuel cell catalyst taking multi-element compound as a carrier and a preparation method thereof, relating to a fuel cell catalyst and a preparation method thereof. The fuel cell catalyst of the invention adopts the mixed material of a granular carbon material (C1) and a linear carbon material (C2) as a carbon basal material; a precipitation thermal decompositing method iscarried out on the two basal materials to prepare a compound carrier MOx-(C1+C2) of a carbon carrier and an oxide; an in-situ chemical reduction method is carried to prepare a Pt / MOx-(C1+C2) catalyst; MOx is CeO2, SnO2, Co3O4 or NiO; C1 is carbon black, carbon microsphere or mesoporous carbon; C2 is carbon fiber or carbon nanometer tube; the linear carbon material is combined with the granular carbon material to form a three-dimensional compound network structure, so as to increase the three-phase reaction activity area of the catalyst; and the doped metal oxide enhances the anti-CO capacity of the catalyst, and improves the use 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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88B01J23/89B01J23/63B01J23/62B01J35/02B01J35/00
CPCY02E60/50
Inventor 江红康晓红朱红黄兆丰魏小岗
Owner BEIJING JIAOTONG UNIV
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