Palladium-cobalt/graphene nano electro-catalyst and preparation method thereof

An electrocatalyst and graphene technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult to control the size of palladium metal particles and the dispersion of noble metal particles Very uniform and other problems, to achieve the effects of reducing content, energy saving efficiency, and improving catalytic activity

Inactive Publication Date: 2013-04-03
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional preparation method of supporting noble metal nanoparticle catalysts on the carbon surface is mainly based on the impregnation-reduction technique, but this method is difficult to control the size of the palladium metal particles loaded on the carbon support, and the dispersion of the noble metal particles on the carbon support is not very uniform. , especially for the preparation of high-loaded Pt / C catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0013] 200 mg of graphite oxide nanosheets were ultrasonically dispersed in 400 mL of ethylene glycol, and then 20 mL of 0.04 M palladium chloride solution, 10 mL of 0.1 M cobalt chloride solution and 20 mL of 1 M sodium acetate solution were added, and stirred well to mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 10 min. After cooling, it is filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a palladium-cobalt / graphene nanometer electrocatalyst. As a comparison, the palladium / graphene catalyst (the mass fraction of palladium is 24.6%) was synthesized by the same method.

[0014] Test and comparison of electrocatalytic performance for formic acid oxidation: Mix a small amount of electrocatalyst (palladium-cobalt / graphene, palladium / graphene nano-electrocatalyst) with an appropriate amount of 5% Nafion solution and absolute ethanol under the ...

Embodiment 2

[0016] 600mg of graphite oxide nanosheets were ultrasonically dispersed in 500mL of ethylene glycol, then 28mL of 0.1M palladium chloride solution, 15mL of 0.1M cobalt chloride solution and 25mL of 1M sodium acetate solution were added, and the mixture was fully stirred and mixed evenly. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 8 min. After cooling, it is filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a palladium-cobalt / graphene nanometer electrocatalyst. As a comparison, a palladium / graphene catalyst (the mass fraction of palladium is 30%) was synthesized by the same method.

[0017] Test and compare the catalytic performance of Pd-Co / graphene and Pd / graphene catalysts to the electrooxidation of formic acid according to the method of Example 1. Under the same conditions, the peak currents of formic acid electrooxidation on the Pd-Co / graphen...

example 3

[0019] 400 mg of graphite oxide nanosheets were ultrasonically dispersed in 600 mL of ethylene glycol, and then 20 mL of 0.05 M palladium chloride solution, 20 mL of 0.1 M cobalt chloride solution and 30 mL of 1 M sodium acetate solution were added, and fully stirred and mixed evenly. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 6 min. After cooling, it is filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a palladium-cobalt / graphene nanometer electrocatalyst. As a comparison, the palladium / graphene catalyst (the mass fraction of palladium was 17%) was synthesized by the same method.

[0020] Test and compare the catalytic performance of Pd / graphene and palladium / graphene catalysts to the electrooxidation of formic acid by the method of Example 1. Under the same conditions, the peak currents of formic acid electrooxidation measured on the above-prep...

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Abstract

The invention discloses a palladium-cobalt/graphene nano electro-catalyst and a preparation method thereof. According to the palladium-cobalt/graphene nano electro-catalyst, palladium serves as an active ingredient, cobalt serves as a cocatalyst, and graphene serves as a carrier; and in the catalyst, the mass fraction of the palladium is 10-40%, the mass fraction of the cobalt is 5-30%, and the balance is the carrier. According to the preparation method of the catalyst, graphite oxide nanosheets are ultrasonically dispersed into polylol, palladium salt liquid, cobalt salt liquid and sodium acetate liquid are then added and fully mixed uniformly, the mixture is then transferred into a microwave hydrothermal reaction kettle, and the filtering, washing and drying processes are carried out after reaction, thereby obtaining the palladium-cobalt/graphene nano electro-catalyst. The preparation method disclosed by the invention has the advantages of energy saving, high speed, simple process and the like; and the particle sizes of palladium and cobalt nanoparticles in the prepared palladium-cobalt/graphene nano electro-catalyst are uniform. The catalyst has high electro-catalytic activity to the electrooxidation of formic acid and is widely applied to fuel cells.

Description

technical field [0001] The invention relates to an electrocatalyst and a preparation method thereof, in particular to a palladium-cobalt / graphene nanometer electrocatalyst and a preparation method thereof. Background technique [0002] The proton exchange membrane fuel cell using hydrogen as fuel is considered to be one of the most promising fuel cell technologies. However, due to the current large-scale production and storage safety issues of hydrogen, the proton exchange membrane fuel cell has not been industrialized. . Direct methanol fuel cells can avoid the safety problems of hydrogen production and storage, but methanol is not easy to electrocatalytic oxidation, and it is easy to permeate through Nafion membrane, which will reduce the performance of the battery. Recent studies have shown that direct formic acid fuel cells using formic acid as fuel overcome the above-mentioned shortcomings to a certain extent, and formic acid is almost non-toxic. Therefore, direct for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B01J23/89
CPCY02E60/50
Inventor 银凤翔李国儒陈标华王亮
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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