Preparation method of titanium carbide loaded platinum-palladium nanoflower electrode catalyst

An electrode catalyst, titanium carbide technology, applied in battery electrodes, circuits, fuel cells, etc., can solve problems such as unreported research on new two-dimensional materials

Active Publication Date: 2021-09-07
北京三川烯能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been studies on the synthesis of noble metal/titanium carbide nanosheet catalysts by directly loading noble metal nanoparticles on the surface o

Method used

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  • Preparation method of titanium carbide loaded platinum-palladium nanoflower electrode catalyst
  • Preparation method of titanium carbide loaded platinum-palladium nanoflower electrode catalyst
  • Preparation method of titanium carbide loaded platinum-palladium nanoflower electrode catalyst

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preparation example Construction

[0043] Such as figure 1 , a preparation method of titanium carbide supported platinum palladium nano flower electrode catalyst, comprising the following steps:

[0044] S1, preparing a titanium carbide nanosheet dispersion;

[0045] S2. Add polyvinylpyrrolidone to the titanium carbide nanosheet dispersion in step S1, stir at a temperature of 0-50°C for 0.5-5h, and mix well to obtain a mixed solution I containing polyvinylpyrrolidone / titanium carbide nanosheet precursor. The mass ratio of titanium carbide to polyvinylpyrrolidone is 1:10-30;

[0046] S3. Add hydrazine solution to the mixed solution I in step S2, stir and react at 0-50°C for 0.5-2h to obtain a black product, then centrifuge and wash 4-8 times at a centrifugal speed of 6000-10000rpm, then use ultra-pure Resuspension in water to obtain a mixed solution II containing hydrazine / polyvinylpyrrolidone / titanium carbide nanosheet precursor; the mass ratio of the hydrazine to the precursor contained in the mixed solution...

Embodiment 1

[0056] A preparation method of titanium carbide supported platinum palladium nano flower electrode catalyst, comprising the following steps:

[0057] S1, preparing a titanium carbide nanosheet dispersion;

[0058] S2. Add polyvinylpyrrolidone to the titanium carbide nanosheet dispersion in step S1, stir at 25°C for 3h, and mix well to obtain a mixed solution I containing polyvinylpyrrolidone / titanium carbide nanosheet precursor. The titanium carbide and The mass ratio of polyvinylpyrrolidone is 1:20;

[0059] S3. Add hydrazine solution to the mixed solution I in step S2, stir and react at 25°C for 1h to obtain a black product, then centrifuge and wash 6 times at a centrifugal speed of 8000rpm, and then resuspend with ultrapure water to obtain hydrazine / The mixed solution II of polyvinylpyrrolidone / titanium carbide nanosheet precursor; the mass ratio of the precursor contained in the hydrazine and the mixed solution I is 0.00008: 1;

[0060] S4. Add chloropalladium acid solu...

Embodiment 2

[0064] The difference between Example 2 and Example 1 is that in step S4, the mass ratio of palladium element in the chloropalladium acid solution, the formic acid and the precursor contained in the mixed solution II is 3.5:0.35:1.

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Abstract

The invention provides a preparation method of a titanium carbide-loaded platinum-palladium nanoflower electrode catalyst, and relates to the field of electrode catalysts. The preparation method comprises the steps of adding a polyvinylpyrrolidone solution into a titanium carbide nanosheet, then adding a hydrazine solution, uniformly mixing, centrifugally washing and re-dispersing to obtain a polyvinylpyrrolidone/titanium carbide nanosheet precursor, then adding a palladium salt solution and a formic acid solution, uniformly mixing, centrifugally washing and re-dispersing to obtain a palladium-modified titanium carbide nanosheet precursor; and then sequentially adding a polyvinylpyrrolidone solution and an ascorbic acid solution, stirring, adding a platinum salt solution, reacting, and finally centrifugally washing and freeze-drying the obtained black precipitate to obtain the titanium carbide loaded platinum-palladium nanoflower electrode catalyst. The titanium carbide nanosheet is used as a template, palladium and platinum are sequentially grown on the surface of the titanium carbide nanosheet in situ, and the prepared electrode catalyst has the advantages of being stable in structure, high in catalytic activity and high in poison resistance.

Description

technical field [0001] The present invention relates to a kind of preparation method of electrode catalyst, specifically, relate to a kind of preparation method of titanium carbide supported platinum palladium nano flower electrode catalyst. Background technique [0002] As an emerging energy conversion device, direct methanol fuel cell has potential applications in various systems of portable electronic devices due to its advantages of high energy conversion efficiency, low pollution emission, and simple structure. Direct methanol fuel cells mainly include methanol oxidation reaction (MOR) on the anode and oxygen reduction reaction (ORR) on the cathode. Among them, the methanol electrooxidation reaction involved in the anode of direct methanol fuel cells usually requires platinum and other noble metal catalysts to catalyze the reaction, but the high price and easy poisoning characteristics of platinum largely hinder its large-scale commercial application. Therefore, the sy...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M8/1011
CPCH01M4/8825H01M4/90H01M4/9041H01M4/921H01M4/925H01M4/9075H01M8/1011Y02E60/50
Inventor 黄华杰杨翠珍李伟华姜全国
Owner 北京三川烯能科技有限公司
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