Compounding method for palladium/graphene structural carbon material combined electrode catalyst

A composite electrode, graphene technology, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of affecting the electrochemical activity and stability of catalysts, poor electrochemical stability of catalysts, palladium nanoparticles falling off, etc. Strong anti-poisoning ability and good stability

Inactive Publication Date: 2013-12-25
NANJING UNIV OF SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Surface oxidation treatment of graphene-structured carbon materials will leave a large number of defects on the surface of carbon materials, making it lose many original excellent properties, thus affecting the electrochemical activity and stability of the final catalyst; for graphene-structured carbon materials Organic modification can also achieve the purpose of supporting palladium nanoparticles. However, since the matrix and particles are often combined through physical interaction in this process, palladium nanoparticles are easy to fall off on the surface of carbon materials, so the electrochemical stability of the catalyst is poor.

Method used

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  • Compounding method for palladium/graphene structural carbon material combined electrode catalyst
  • Compounding method for palladium/graphene structural carbon material combined electrode catalyst
  • Compounding method for palladium/graphene structural carbon material combined electrode catalyst

Examples

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Effect test

Embodiment 1

[0023] Implementation example 1: Palladium-graphene composite electrode catalyst (mass ratio palladium:graphene=1:1)

[0024] In the first step, 0.10 g of natural graphite is added to 1000 mL of 1-methyl-2-pyrrolidone, ultrasonicated at 20 ° C for 2 hours and then left to stand to obtain a graphene dispersion solution;

[0025] Second step, measure the dispersion solution of 120mL graphene, add the 0.94mol / L palladium nitrate solution of 40mL ethylene glycol and 0.012mL respectively thereinto, stir;

[0026] In the third step, the reaction system in the second step is transferred to a hydrothermal kettle for reaction at 120° C. for 12 hours;

[0027] In the fourth step, the reaction system in the third step is centrifuged to separate the solid product, washed with deionized water, and dried to obtain a palladium-graphene composite electrode catalyst.

[0028] figure 2 For adopting the Raman spectrogram of the palladium-graphene catalyst that embodiment example 1 prepares....

Embodiment 2

[0030] Implementation example 2: Palladium-carbon nanotube composite electrode catalyst (mass ratio palladium: carbon nanotube=10:1)

[0031] In the first step, add 0.01g of carbon nanotubes to 1000mL of 1-methyl-2-pyrrolidone, ultrasonicate for 1 hour at 25°C and let stand;

[0032] In the second step, measure 120 mL of the dispersion solution of multi-walled carbon nanotubes, add 600 mL of ethylene glycol and 0.122 mL of 0.94 mol / L palladium nitrate solution, and stir evenly;

[0033] In the third step, the reaction system in the second step is transferred to a hydrothermal kettle for reaction at 200° C. for 2 hours;

[0034] In the fourth step, the reaction system in the third step is centrifuged to separate the solid product, washed with deionized water, and dried to obtain a palladium-carbon nanotube composite electrode catalyst.

Embodiment 3

[0035] Implementation example 3: Palladium-fullerene composite electrode catalyst (mass ratio palladium:fullerene=1:10)

[0036] In the first step, 1.00g of fullerene was added to 1000mL of 1-methyl-2-pyrrolidone, ultrasonicated at 30°C for 3 hours and left to stand;

[0037] In the second step, measure 120 mL of fullerene dispersion solution, add 24 mL of ethylene glycol and 0.122 mL of 0.94 mol / L palladium nitrate solution, and stir evenly;

[0038] In the third step, the reaction system in the second step is transferred to a hydrothermal kettle for reaction at 20° C. for 36 hours;

[0039] In the fourth step, the reaction system in the third step is centrifuged to separate the solid product, washed with deionized water, and dried to obtain a palladium-fullerene composite electrode catalyst.

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Abstract

The invention discloses a compounding method of palladium and a graphene structural carbon material (selected from one of graphene, carbon nanotube or fullerene), and helps to prepare a palladium/graphene structural carbon material combined electrode catalyst. The compounding method comprises the following steps: putting a graphene structural carbon material in 1-methyl-2-pyrrolidone and performing ultrasonic dispersion; respectively adding glycol and a palladium nitrate solution and mixing uniformly, then transferring the mixed system in a hydro-thermal kettle for a reaction, after the reaction is finished, centrifugally separating to obtain a solid product, performing washing and drying to obtain the palladium/graphene structural carbon material combined electrode catalyst. According to the compounding method, the graphene structural carbon material is taken as a substrate; and by employing the hydro-thermal synthetic method, the prepared palladium/graphene structural carbon material combined electrode catalyst has better application prospect and economical benefit in the field of direct methanol fuel cells.

Description

technical field [0001] The invention relates to a composite electrode catalyst preparation technology which uses a graphene-structured carbon material as a base and deposits crystal palladium nanoparticles on its surface, and belongs to the field of material preparation. [0002] Especially the composite method of palladium-graphene structure carbon material composite electrode catalyst with low defect degree, high stability and high catalytic activity. Background technique [0003] In the face of increasingly severe energy crisis and environmental pollution, environmental protection and energy conservation and emission reduction have become the only way for social development, and changing the way of energy production and consumption has broad prospects in the future. Among them, the fuel cell is an important and developable energy conversion system. Direct formic acid fuel cells have attracted much attention due to their advantages of high efficiency, safety, greenness an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCY02E60/50
Inventor 汪信黄华杰朱俊武胡辰尧
Owner NANJING UNIV OF SCI & TECH
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