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Carbon material supported platinum catalyst, and preparation method and application thereof

A platinum catalyst and carbon material technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as lack of catalyst data

Pending Publication Date: 2021-09-07
北京未来氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the precursor of platinum does not contain halogen elements, and the obtained catalyst is cleaner. The disadvantage is that the reducing agent used is formaldehyde, which is highly toxic, and there is a lack of catalyst activity test data.

Method used

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  • Carbon material supported platinum catalyst, and preparation method and application thereof
  • Carbon material supported platinum catalyst, and preparation method and application thereof
  • Carbon material supported platinum catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 0.5g of carbon material and 155mL of chloroplatinic acid (6mmol) and add it to 478mL of glycerol solvent, disperse and form a suspension by ultrasonic (power 400W, frequency 20Hz, time 20min), add 100ml tartaric acid solution in glycerol (1g tartaric acid) ;Heat the above suspension to 150°C, pass through nitrogen protection, add sodium borohydride solution of glycerol 100mL (60mmol) dropwise under stirring evenly to carry out reduction reaction, keep for 4h; after 4h, stop heating, continue stirring for 16h, The reacted mixture was filtered, washed until neutral, and dried to obtain a carbon-supported platinum catalyst with a platinum loading of 70%, represented by Pt / C-70%.

[0041] When the mixture is filtered, a device with a filter diameter of 1-2 microns can be selected.

[0042] Such as figure 1 Shown is the TEM image of the carbon material-supported platinum Pt / C-70% catalyst prepared in Example 1 above. This figure shows that platinum nanoparticles are hi...

Embodiment 2

[0045]Get 1 gram of carbon material and 88.5mL of chloroplatinic acid (3.4mmol) and join in 478mL of glycerol solvent, ultrasonic (power 400W, frequency 20Hz, time 20min) dispersed to form a suspension, add 100ml of tartaric acid glycerol solution (1g tartaric acid); heat the above suspension to 150°C, pass through nitrogen protection, add sodium borohydride solution of glycerin 80mL (34mmol) dropwise under stirring evenly to carry out reduction reaction, keep for 4h; after 4h, stop heating and continue stirring After 16 hours, the reacted mixture was filtered, washed until neutral, and dried to obtain a carbon-supported platinum catalyst with a platinum loading of 40%, represented by Pt / C-40%.

Embodiment 3

[0047] Take 0.5g of carbon material and 155mL of chloroplatinic acid (6mmol) and add it to 478mL of glycerol solvent, disperse and form a suspension by ultrasonic (power 400W, frequency 20Hz, time 20min), add 100ml tartaric acid solution in glycerol (1g tartaric acid) ;Heat the above suspension to 150°C, pass it under argon protection, add 100mL (60mmol) of the glycerin solution of N,N-dimethylaniline borane complex dropwise under stirring evenly to carry out the reduction reaction, and keep it for 4h After 4h, stop heating, continue to stir for 16h, filter the reacted mixture, wash to neutrality, and dry to obtain a carbon-supported platinum catalyst with a platinum loading of 70%, represented by Pt / C-70%.

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Abstract

The invention belongs to the technical field of fuel cell material manufacturing and electro-catalysis, and discloses a carbon material supported platinum catalyst, and a preparation method and application thereof. According to the method, the carbon-supported platinum fuel cell catalyst is prepared by reduction of a boron-containing compound in a polyol solvent. Inert gas is introduced to protect the reaction suspension, so that oxygen atoms are prevented from entering the platinum nanoparticles. A boron-containing compound is used as a reducing agent, and a Pt / C catalyst is prepared by reaction in a polyol solvent, so that the problems of temperature rise and easy bumping of a solution caused by use of a strong reducing agent are solved. The obtained product is filtered, washed and dried, the high-activity platinum-carbon type catalyst with good dispersity and uniform Pt particle size is obtained, and the mass ratio activity reaches 0.2 A / mgPt. The catalyst is good in stability, the performance of the catalyst is better than that of a commercial platinum-carbon catalyst, the defect that a Pt / C type catalyst is prepared by using a strong reducing agent boron-containing compound is overcome, and after 5000 circles of stability tests of 70% of the Pt / C catalyst, the electrochemical active area decrease rate is smaller than 2%, and the mass ratio activity decrease rate is smaller than 8%.

Description

technical field [0001] The invention belongs to the technical field of fuel cell material manufacturing and electrocatalysis, and in particular relates to a carbon material supported platinum catalyst and its preparation method and application. Background technique [0002] Fuel cell is a green energy technology, which directly converts the chemical energy of the reaction of oxygen and hydrogen into electrical energy under the action of a catalyst, with high conversion efficiency. Unlike other battery energy storage technologies, fuel cells can continuously provide energy as long as the raw materials are sufficient. Compared with other types of fuel cells, proton exchange membrane hydrogen fuel cells have become the first choice for the current long-distance driving technology of new energy vehicles because of their low operating temperature, quick start-up to generate electricity, and the characteristics of easy management of solid electrolytes. However, the cost of the no...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/926H01M4/921H01M4/8825H01M4/88Y02E60/50
Inventor 苏才华
Owner 北京未来氢能科技有限公司