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Graphene loaded platinum-cobalt alloy nanoparticle composite catalyst and preparation method thereof

A technology of alloy nanoparticles and composite catalysts, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of restricting wide application, poor electrochemical stability and high price, and achieve The effect of strong operability, high catalytic activity and durability

Active Publication Date: 2015-04-22
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commercial Pt / C is currently the most commonly used electrocatalyst for oxygen reduction, but the limited reserves and high price of platinum limit its wide application in industry.
In addition, the electrochemical stability of Pt / C catalysts in strong acid or strong alkali medium is also poor, which cannot meet the needs of long-term stable operation in actual industrial production.

Method used

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  • Graphene loaded platinum-cobalt alloy nanoparticle composite catalyst and preparation method thereof
  • Graphene loaded platinum-cobalt alloy nanoparticle composite catalyst and preparation method thereof
  • Graphene loaded platinum-cobalt alloy nanoparticle composite catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of Platinum-Cobalt Alloy Nanoparticle Composite Catalysts Supported by Reduced Graphene with Platinum-Cobalt Alloy Ratio of 3:1

[0024] (1) Take 100mg of reduced graphene, add 50-200mg of citric acid and 5-20ml of deionized water, mix well and dry, then pass in Ar gas, keep it at 200-400°C for half an hour, and finally cool it with the furnace to get Pretreatment of reduced graphene powder;

[0025] (2) Take 50ml of ethylene glycol, add 9.3ml of 0.01M chloroplatinic acid ethylene glycol solution and 0.31ml of 0.1M cobalt chloride aqueous solution respectively. Then add the reduced graphene powder pretreated in step (1) into the above mixed solution, sonicate for 30 minutes, and adjust the pH of the solution to 8-12 with NaOH solution to obtain a suspension;

[0026] (3) Put the suspension obtained in step (2) into a round-bottomed flask, add 20ml of 0.5-2M NaBH4 aqueous solution dropwise under stirring at 50-120°C, and react at this temperature for 3h. Af...

Embodiment 2

[0030] Preparation of Platinum-Cobalt Alloy Nanoparticle Composite Catalysts Supported by Reduced Graphene with Platinum-Cobalt Alloy Ratio of 1:1

[0031] (1) Take 100mg of reduced graphene, add 50-200mg of citric acid and 5-20ml of deionized water, mix well and dry, then pass in Ar gas, keep it at 200-400°C for half an hour, and finally cool it with the furnace to get Pretreatment of reduced graphene powder;

[0032] (2) Take 50ml of ethylene glycol, add 7.9ml of 0.01M chloroplatinic acid ethylene glycol solution and 0.79ml of 0.1M cobalt chloride aqueous solution respectively. Then add the reduced graphene powder pretreated in step (1) into the above mixed solution, sonicate for 30 minutes, and adjust the pH of the solution to 8-12 with NaOH solution to obtain a suspension;

[0033] (3) Put the suspension obtained in step (2) into a round-bottomed flask, add 20ml of 0.5-2M NaBH4 aqueous solution dropwise under stirring at 50-120°C, and react at this temperature for 3h. Af...

Embodiment 3

[0037] Preparation of Platinum-Cobalt Alloy Nanoparticle Composite Catalysts Supported by Reduced Graphene with Platinum-Cobalt Alloy Ratio of 1:4

[0038] (1) Take 100mg of reduced graphene, add 50-200mg of citric acid and 5-20ml of deionized water, mix well and dry, then pass in Ar gas, keep it at 200-400°C for half an hour, and finally cool it with the furnace to get Pretreatment of reduced graphene powder;

[0039] (2) Take 50ml of ethylene glycol, add 4.6ml of 0.01M chloroplatinic acid ethylene glycol solution and 1.84ml of 0.1M cobalt chloride aqueous solution respectively. Then add the reduced graphene powder pretreated in step (1) into the above mixed solution, sonicate for 30 minutes, and adjust the pH of the solution to 8-12 with NaOH solution to obtain a suspension;

[0040] (3) Put the suspension obtained in step (2) into a round-bottomed flask, add 20ml of 0.5-2M NaBH4 aqueous solution dropwise while stirring at 50-120°C, and react at this temperature for 3h. Af...

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Abstract

The invention relates to a graphene loaded platinum-cobalt alloy nanoparticle composite catalyst and a preparation method thereof, belonging to the technical field of composite catalysts. Platinum-cobalt alloy nanoparticles have a particle size of 2-10 nm and are uniformly dispersed on the surface of a graphene carrier. The preparation method comprises the following step: performing simple citric acid pretreatment on the graphene to prepare the graphene loaded platinum-cobalt alloy nanoparticle composite catalyst. The preparation method is simple and easy to implement and high in operability. The prepared alloy catalyst is solid powder, and the nano alloy particles of which the particle size is 2-10 nm are uniformly dispersed on the graphene. The catalyst has very high electrocatalytic activity and stability for oxygen reduction reaction in an alkaline medium or acidic medium, and the performance of the catalyst is superior to that of a commercial Pt / C catalyst (E-TEK).

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a graphene-supported platinum-cobalt alloy nanoparticle composite catalyst and a preparation method thereof, belonging to the technical field of composite catalysts. Background technique [0002] Oxygen reduction reaction is one of the most important cathode reactions in the industrial field, and is widely used in fuel cells, metal-air batteries, chlor-alkali industry, and electrochemical sewage treatment. However, due to the slow kinetics of the oxygen reduction reaction itself, efficient electrocatalysts are often required to accelerate the reaction. Currently, oxygen reduction electrocatalysts mainly include noble metals (such as platinum) and their alloy catalysts, non-noble metal catalysts, organometallic complexes, and carbon materials. Commercial Pt / C is currently the most commonly used electrocatalyst for oxygen reduction, but the limited reserves and high price...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921Y02E60/50
Inventor 刘景军王峰赵艺阁宋夜李志林吉静窦美玲覃事永王伟红康建忠
Owner BEIJING UNIV OF CHEM TECH