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Graphene-loaded double-metal nano particles for methanol and ethanol fuel cells, and preparation method for graphene-loaded double-metal nano particles

A bimetallic nanometer and fuel cell technology, applied in nanotechnology for materials and surface science, fuel cell components, nanotechnology, etc., can solve the problems of high catalyst cost and unfavorable mass industrial production and application, and achieve The effect of short reaction time, overcoming the reduction of catalytic activity, and reducing cost

Inactive Publication Date: 2012-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the high cost of catalysts based on platinum and palladium is not conducive to large-scale industrial production applications

Method used

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  • Graphene-loaded double-metal nano particles for methanol and ethanol fuel cells, and preparation method for graphene-loaded double-metal nano particles
  • Graphene-loaded double-metal nano particles for methanol and ethanol fuel cells, and preparation method for graphene-loaded double-metal nano particles
  • Graphene-loaded double-metal nano particles for methanol and ethanol fuel cells, and preparation method for graphene-loaded double-metal nano particles

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] The preparation of example 1 cobalt-gold nanoparticles:

[0034] In this experiment, sodium borohydride was used as the reducing agent to prepare cobalt-gold (2.5 parts) bimetallic nanoparticles. Cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O, 1.79 parts) and chloroauric acid (HAuCl 4 ) (3.33 parts) is added in 40 parts of water-ethanol mixed solution (volume ratio is 1: 1), then adds 63 parts of sodium citrate and sodium dodecylsulfonate mixture, both mass ratios are 3: 60, stir One hour. Then 1 part of freshly prepared sodium borohydride was added dropwise to the above solution under stirring, and stirred at room temperature for one hour to generate uniformly dispersed cobalt-gold structure nanoparticles, and finally 10 parts of graphene oxide and 120 parts of sodium borohydride (make it into an aqueous solution and add it dropwise) add the above-mentioned solution successively, stir at room temperature for 12 hours, and generate black precipitate-graphene loade...

example 2

[0036] The preparation of example 2 cobalt-gold nanoparticles:

[0037] Cobalt-gold (2.5 parts) bimetallic nanoparticles were prepared using sodium borohydride as reducing agent. Will Co(NO 3 ) 2 ·6H 2 O (0.4 parts) and HAuCl 4 (4.17 parts) into 40 parts of water-ethanol mixed solution (volume ratio is 1: 1), then add 33 parts of sodium citrate and sodium dodecylsulfonate mixture, the mass ratio of the two is 3: 30, stir for one Hour. Then a freshly prepared portion of sodium borohydride was added dropwise to the above solution under stirring, stirred at room temperature for one hour to generate uniformly dispersed cobalt-gold nanoparticles, and finally 10 parts of graphene oxide and 120 parts of sodium borohydride ( Make into an aqueous solution and add dropwise) into the above solution in turn, and stir at room temperature for 12 hours to generate black precipitate-graphene loaded with cobalt-gold nanoparticles. The precipitate was centrifuged with a centrifuge, washed...

example 3

[0039] The preparation of example 3 cobalt-gold nanoparticles:

[0040] Cobalt-gold (2.5 parts) bimetallic nanoparticles were prepared using sodium borohydride as reducing agent. Will Co(NO 3 ) 2 ·6H 2 O (9 parts) and HAuCl 4 (1.17 parts) by adding 40 parts of water-ethanol mixed solution (volume ratio is 1: 1), then add 103 parts of sodium citrate and sodium dodecylsulfonate mixture, the mass ratio of the two is 3: 100, stir One hour. Then a freshly prepared portion of sodium borohydride was added dropwise to the above solution under stirring, stirred at room temperature for one hour to generate uniformly dispersed cobalt-gold nanoparticles, and finally 10 parts of graphene oxide and 120 parts of sodium borohydride ( Make into an aqueous solution and add dropwise) into the above solution in turn, and stir at room temperature for 12 hours to generate black precipitate-graphene loaded with cobalt-gold nanoparticles. The precipitate was centrifuged with a centrifuge, washe...

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Abstract

The invention relates to graphene-loaded double-metal nano particles for methanol and ethanol fuel cells, and a preparation method for the graphene-loaded double-metal nano particles. The method comprises the following steps of: sequentially adding graphene oxide, polymeric dispersant, and anionic surfactant into a water-ethanol mixed solution, stirring, adding double-metal nano particles, and adding sodium borohydride to obtain black precipitate double-metal nano particle graphene; and performing centrifugal separation on precipitate by using a centrifugal machine, repeatedly washing by using secondary deionized water and ethanol to remove unreacted reactant, and then performing vacuum drying. According to the method, gold and silver which is low in price, and non-noble metal such as cobalt and nickel which is lower in price is used instead of noble metal such as platinum and ruthenium which is high in price, so cost is reduced. Methanol is catalyzed and ethanol is oxidized under thealkaline condition, so the condition that intermediate carbon monoxide poisons a catalyst under the acid condition so that the activity of the catalyst is reduced can be effectively overcome. The graphene-loaded double-metal nano particles can be directly used for methanol and ethanol fuel cells, formic acid fuel cells, and organic catalytic reaction.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials. It relates to a graphene-supported bimetallic nanoparticle and its preparation method for methanol and ethanol fuel cells, especially the preparation method of cobalt-gold / graphene, nickel-silver / graphene and cobalt-silver / graphene composite nanoparticle . Background technique [0002] Single metal nanoparticles or bimetallic nanoparticles have electrochemical catalytic activity and can be used as electrode materials for direct methanol and ethanol fuel cells, as well as direct formic acid fuel cells. Platinum and platinum-based catalysts (such as platinum-silver, platinum-cobalt, platinum-iron, etc.) are usually used to catalyze methanol oxidation under acidic conditions. Under acidic conditions, the intermediate carbon monoxide produced by the oxidation of methanol poisons the catalyst and reduces its catalytic activity. However, under alkaline conditions, the kinetics of methano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/86H01M8/02B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 高建平郭永琴王为张娜娜武涛
Owner TIANJIN UNIV
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