Method for preparing fuel cell catalyst

A fuel cell and catalyst technology, applied in the field of electrochemistry, can solve problems such as unfavorable catalyst particle size, Pt nanoparticle particle size growth, and control.

Inactive Publication Date: 2012-07-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the organic protective agent molecules used in the above reports need to be removed by heat treatment, otherwise they will occupy the active sites and affect the electrocatalytic activity (Dubeau L., Coutanceau C., Garnier E., L

Method used

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  • Method for preparing fuel cell catalyst
  • Method for preparing fuel cell catalyst
  • Method for preparing fuel cell catalyst

Examples

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preparation example Construction

[0032] The invention discloses a preparation method of a fuel cell catalyst, comprising the following steps:

[0033] H 2 PtCl 6 , the carrier and glucose are added to deionized water, the pH value is adjusted to 8-13, and a suspension is obtained after the reaction;

[0034] Add NaBH to the suspension 4 Solution, after the reaction, a fuel cell catalyst is obtained.

[0035] The present invention uses NaBH 4 As reducing agent, using NaBH 4 H 2 PtCl 6 Reduction gives Pt atoms. At the same time, glucose is used as a protective agent to control the interaction between the generated Pt atoms and the hydroxyl groups of glucose by adjusting the pH value to control the deposition of new Pt atoms, thereby controlling the particle size of the obtained fuel cell catalyst.

[0036] In the above-mentioned preparation steps for obtaining the suspension, H 2 PtCl 6 As a Pt source; the carrier is preferably activated carbon, carbon nanotubes, graphene or titanium dioxide; H 2 PtC...

Embodiment 1

[0052] To prepare Pt / C with a Pt content of 20wt%, the carrier Vulcan XC-72R was used.

[0053] Add 1.2g β-D-glucose (1.2g β-D-glucose) into 20mL deionized water to obtain a glucose solution; add 130mg NaBH 4 Dissolve in 50mL deionized water to get NaBH 4 solution;

[0054] 126mg of Vulcan XC-72R carrier was ultrasonically dispersed in 80mL of deionized water for 2 hours, and the glucose solution was added to the above ink under magnetic stirring; then, 30mL of precursor solution-chloroplatinic acid aqueous solution was added, containing 32mg of Pt element;

[0055] After stirring at room temperature for 4 hours, the NaBH was added dropwise 4 Solution, continue to stir for 8 hours, then use deionized water with a resistivity of 18.2MΩ cm to wash, and filter and wash until there is no Cl - exists, i.e. adding AgNO to the filtrate 3 There was no precipitation in the solution, and finally it was vacuum-dried at 80° C. to obtain a fuel cell catalyst, marked as Pt / C-a.

[0056...

Embodiment 2

[0061] Using the same preparation method as in Example 1, adjust the pH to 10 before adding the reducing agent.

[0062] The testing method and experimental conditions of this example are the same as those of Example 1, and the fuel cell catalyst prepared in Example 2 is marked as Pt / C-b.

[0063] Figure 5 and Image 6 The transmission electron microscope pictures and particle size distribution diagrams of the fuel cell catalyst prepared for this example show that the average particle size is 2.7nm, and the distribution is narrow and the dispersion is good.

[0064] The fuel cell catalyst powder prepared in this example is ground and mixed with KBr and pressed into tablets for infrared transmission spectrum testing. The results are shown in image 3 .

[0065] The mass specific activity curve of the fuel cell catalysis prepared in this example is as follows Figure 4 Shown, the mass specific activity is 416.5mA / mg Pt .

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Abstract

The invention discloses a method for preparing a fuel cell catalyst, comprising the following steps of: adding H2PtC16, carriers and glucose to de-ionized water, adjusting the pH value, and obtaining turbid liquid after reaction; adding a NaBH4 solution to the turbid liquid, and then obtaining the fuel cell catalyst after reaction. According to the method disclosed by the invention, Pt atoms are obtained by reducing H2PTC16 by NaBH4. According to the method, with the glucose as a protector, Pt atoms are controlled to act with the hydroxyl of the glucose by adjusting the pH value, and the deposition of the newly produced Pt atoms is controlled, thus the grain diameter of the fuel cell catalyst is controlled. The method is capable of controlling the grain diameter of the prepared fuel cell catalyst and the dispersibility of the prepared fuel cell catalyst is better. In addition, because the glucose as the protector employed in the method can be removed by methods, such as water washing, the increase of the grain diameter of Pt nanoparticles caused by removing the protector through thermal treatment is avoided and the methane electro-catalytic activity of the catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and more specifically, relates to a preparation method of a fuel cell catalyst. Background technique [0002] As the world's population and human activities grow, humans are often limited by the ability to supply electrical energy to support their various activities. A fuel cell is a device that directly converts chemical energy into electrical energy through an electrochemical reaction, that is, a fuel cell generates electricity electrochemically, using liquid or gaseous fuel, and generating electrical energy and a small amount of heat after reacting with oxygen. Moreover, the product discharged after the fuel cell generates electric energy is water, which meets the requirements of environmental protection, thereby solving the inherent pollution problem of the combustion process. Since Gove first proposed the concept of fuel cells in 1839, fuel cells have received more and more attenti...

Claims

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Application Information

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IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 邢巍司凤占殷敏黄云杰刘长鹏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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