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Three-dimensional carbon structure loaded platinum catalyst and preparation method thereof

A platinum catalyst and carbon structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of uneven Pt loading, poor stability and durability, and low catalyst activity of carbon-supported Pt catalysts, and achieve abundant catalysts Surface functional groups and unsaturated coordination bonds, reducing performance loss and improving catalytic activity

Pending Publication Date: 2022-01-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing carbon-supported Pt catalysts, there are the following main problems: 1. The activity of bulk carbon-supported Pt catalysts is not high, and the catalytic efficiency is low; 2. Although low-dimensional carbon-supported Pt catalysts have high activity, they are prone to CO poisoning. Poor stability and durability; 3. The carbon-supported Pt catalyst has uneven Pt loading, excessive loading, etc.

Method used

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  • Three-dimensional carbon structure loaded platinum catalyst and preparation method thereof
  • Three-dimensional carbon structure loaded platinum catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Take the three-dimensional carbon structure raw material, make the uniform mixed powder with carbon nanotube 0.5g, graphene 0.5g, fullerene 0.5g, carbon black 1g, add the 10wt% nitric acid solution that parts by weight are 10g to the powder, Stirring at 60°C for 5 hours, the resulting mixture was washed with water and suction-filtered and dried at 60°C for 5 hours, the dried product was ball milled at 250rpm for 1 hour, and 10 g of three-dimensional carbon structure powder after ball milling, hexahydroxyplatinic acid di(ethanolammonium ) aqueous solution 5g, ethanol 500g, and deionized water 50g were placed in a reaction kettle, NaOH solution was added dropwise to adjust the pH of the mixture to 11, and the temperature was kept at 70°C for 2 hours with a magnetic stirrer. 5 hours, N 2 Anneal in an atmosphere with a gas flow rate of 80 sccm for 1 hour at an annealing temperature of 150°C. Transfer the calcined product to a rotatable ceramic crucible in a plasma-enhanced ...

Embodiment 2

[0029] Just change the process in step 1 to: 1.5g of carbon nanotubes, 1.5g of graphene, 1.5g of fullerenes, 10g of carbon black are made into uniformly mixed powders, and the other conditions are the same, as in Example 1, the prepared catalyst 20wt% three-dimensional carbon structure supported Pt catalyst. The average particle size of platinum in the product is 2.7nm, the chloride content is 83ppm, the water content is 0.52wt%, and the mass activity is 365mA / mgPt@0.9V. After 10000 cycles of aging test, its mass activity decays by 9%.

Embodiment 3

[0031] Just change the process in step 1 to: add 10g of 10wt% nitric acid solution to the powder, stir at 80°C for 10 hours, wash the resulting mixture with water and suction filter and dry at 80°C for 10 hours, and ball mill the dried product at 400rpm for 2 hours, Other conditions remain unchanged, the same as in Example 1, the prepared catalyst is a 20wt% Pt catalyst supported by a three-dimensional carbon structure. The average particle size of platinum in the product is 4.5nm, the chloride content is 60ppm, the water content is 0.37wt%, and the mass activity is 286mA / mgPt@0.9V. After 10000 cycles of aging test, its mass activity decays by 7.3%.

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Abstract

The invention discloses a three-dimensional carbon structure loaded platinum catalyst and a preparation method thereof, and belongs to the technical field of fuel cell catalysts. The method comprises the following steps of 1) carrying out a pretreatment process on carbon-based materials with various structures to obtain three-dimensional carbon structure powder; 2) uniformly mixing three-dimensional structure carbon powder, a hexahydroxyplatinic acid di (ethanol ammonium) aqueous solution, ethanol and deionized water to obtain a primary reaction solution; (3) regulating the primary reaction liquid to a proper pH value by using NaOH, and carrying out heating reaction to prepare the three-dimensional carbon structure loaded Pt; 4) obtaining a primary product of the three-dimensional carbon structure loaded Pt catalyst through a calcining means; and 5) carrying out plasma treatment by adopting a plasma enhanced chemical vapor deposition system to obtain the final three-dimensional carbon structure loaded Pt catalyst. The mass activity of the prepared three-dimensional carbon structure supported Pt catalyst prepared through the present invention is larger than 350 mA / mgPt@0.9 V, and after 10000 circles of aging tests, the mass activity attenuation is smaller than 10%.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and relates to a three-dimensional carbon structure supported platinum (Pt) catalyst and a preparation method thereof. Background technique [0002] The development of human society is getting faster and faster, and people's material life is getting richer and richer. However, it is accompanied by the sharp reduction of the earth's fossil energy reserves and the deterioration of the ecological environment. In the environment of energy depletion, people must find new ways to replace fossil energy. Hydrogen, methanol and other fuels have attracted widespread attention as substitutes for gasoline and diesel. Among them, proton exchange membrane fuel cell is one of the important ways to utilize hydrogen energy. A proton exchange membrane fuel cell is a device that converts chemical energy into electrical energy. Its high energy conversion efficiency is due to the high activity and high ...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/926H01M4/8825Y02E60/50
Inventor 王如志杨孟骐刘金伟
Owner BEIJING UNIV OF TECH