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High-performance oxygen reduction catalyst based on surface function enhancement and preparation method thereof

A catalyst and high-performance technology, applied in the field of electrochemistry, can solve problems such as poor activity, poor stability, and poor toxicity resistance, and achieve the effects of low cost, uniform distribution, and uniform particle size

Pending Publication Date: 2019-06-28
江苏介观催化材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of poor activity of existing oxygen reduction reaction catalysts, poor stability due to migration and agglomeration of Pt, and poor toxicity resistance, and provide a high-activity, high-efficiency catalyst based on mesoscopic structure. A fuel cell catalyst with high stability and high toxicity resistance, and a preparation method of the above-mentioned catalyst is provided

Method used

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  • High-performance oxygen reduction catalyst based on surface function enhancement and preparation method thereof
  • High-performance oxygen reduction catalyst based on surface function enhancement and preparation method thereof
  • High-performance oxygen reduction catalyst based on surface function enhancement and preparation method thereof

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Effect test

Embodiment 1

[0062] (1) Carbon carrier pretreatment

[0063] Measure the Vulcan XC-72R of 5g quality and the acetone of 200g, mix Vulcan XC-72R and acetone, filter after stirring at room temperature for 6h, after the filtrate is dried, transfer to the nitric acid solution that the mass fraction is 10%, in After stirring at 60°C for 5 hours, the filtered product was washed with deionized water until the pH was neutral, and then dried at 70°C to obtain the pretreated Vulcan XC-72R carrier.

[0064] (2) metal platinum loading

[0065] 1. According to the loading of platinum element as 12%, weigh 2g of pretreated Vulcan XC-72R and 0.66g of chloroplatinic acid hexahydrate, and dissolve it according to the mass ratio of chloroplatinic acid and deionized water as 1:10 to obtain Aqueous solution of chloroplatinic acid. 2. Add all the aqueous solution of chloroplatinic acid into 2 g of pretreated Vulcan XC-72R to obtain a mixture. 3. The mixture was ultrasonically dispersed for 0.5 h, and then m...

Embodiment 2

[0093] (1) Carbon carrier pretreatment

[0094] Measure the Vulcan XC-72 of 2g quality and the acetone of 50g, mix Vulcan XC-72 and acetone, filter after stirring at room temperature for 3h, after the filtrate is dried, transfer to the nitric acid solution that the mass fraction is 10%, in After stirring at 80°C for 6 hours, the filtered product was washed with deionized water until the pH was neutral, and then dried at 70°C to obtain the pretreated VulcanXC-72 carrier.

[0095] (2) metal platinum loading

[0096] 1. Based on the platinum element loading of 20%, weigh 2g of pretreated Vulcan XC-72R and 1.19g of ammonium chloroplatinate hexahydrate, and the mass ratio of ammonium chloroplatinate to deionized water is 1:10, Dissolving to obtain an aqueous solution of ammonium chloroplatinate. 2. Add all the ammonium chloroplatinate aqueous solution to 2 g of pretreated Vulcan XC-72R to obtain a mixture. 3. The mixture was ultrasonically dispersed for 1 h, and then mechanicall...

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Abstract

The invention discloses a high-performance oxygen reduction catalyst based on surface function enhancement provides a preparation method of the above catalyst. The catalyst is a HCM / Pt / C catalyst witha core-shell structure, the material of the shell is a porous heteroatom-doped carbon material coating the surface of a Pt active center. Since the heteroatom-doped carbon material has a special adsorption-enrichment effect on oxygen, the material can provide an oxygen-rich environment for an active site, the collision frequency of reaction gas oxygen and the active site is increased, and the kinetic reaction rate of an oxygen reduction reaction is greatly improved. At the same time, the electronic effect at a HCM / Pt interface optimizes the electronic structure of Pt, so that the adsorption of Pt on an oxygen reduction reaction intermediate is weakened, and the desorption rate is increased to provide a site for subsequent oxygen adsorption. On the other hand, a carbon shell around Pt particles prevents migration and agglomeration, and the overall stability of the catalyst is greatly improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a high-performance oxygen reduction catalyst based on surface function enhancement and a preparation method thereof. Background technique [0002] Faced with the severe challenge of the depletion of fossil fuel resources and the enormous pressure on people's healthy life brought by environmental degradation, the society is increasingly calling for alternative energy sources. A fuel cell is an energy conversion device that uses renewable hydrogen, alcohol and other high-energy substances as fuel to directly convert the chemical energy in the fuel into electrical energy. It has the advantages of high energy conversion efficiency, low emissions, and low pollution. Based on these advantages, fuel cells have broad application prospects in the fields of power supply, backup power supply and small fixed power supply system, and are expected to help solve the increasingly serious energy a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1011H01M8/1018H01M12/06H01M12/08B82Y30/00
CPCY02E60/50
Inventor 丁维平陈腾魏大力赵斌许逸达郭学锋彭路明祝艳郭向可薛念华金鹏
Owner 江苏介观催化材料科技有限公司
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