Trace palladium nanoparticle for electrochemical catalysis ethanol oxidation, preparation method and application of trace palladium nanoparticle

A technology for palladium nanoparticles and ethanol oxidation, which can be applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as reducing the amount of palladium

Inactive Publication Date: 2015-02-18
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Trace palladium nanoparticle for electrochemical catalysis ethanol oxidation, preparation method and application of trace palladium nanoparticle
  • Trace palladium nanoparticle for electrochemical catalysis ethanol oxidation, preparation method and application of trace palladium nanoparticle

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Embodiment 1

[0019] (1) 40 mg nickel chloride (NiCl 2 ·6H 2 O) Dissolved in 20 mL of ethylene glycol / water mixed solvent with a volume ratio of 1:1, then added 200 mg of graphene powder, and the mixture was o After ultrasonic dispersion in a water bath of C for 10 minutes, slowly add dilute NaOH solution to the mixture to adjust the pH of the mixture to 8-9; then continue to ultrasonically disperse the mixture for 1 hour to form nickel ions uniformly dispersed in the graphene Dispersion on the surface.

[0020] (2) Heat the above dispersion system in a water bath to 40 o C. Slowly add 6 mL of 5% hydrazine hydrate aqueous solution under continuous stirring. After the addition, continue to stir for 3 hours, filter while hot, wash with water until neutral, and then wash with ethanol twice, and the obtained black solid Immediately blow dry with nitrogen, then place in a vacuum oven, and dry at room temperature for 24 hours to obtain graphene-supported nickel nanoparticles.

[0021] (3)...

Embodiment 2

[0025] (1) 80 mg nickel chloride (NiCl 2 ·6H 2 O) Dissolved in 40 mL of ethylene glycol / water mixed solvent with a volume ratio of 1:1, then added 500 mg of graphene powder, and the mixture was o After ultrasonic dispersion in a water bath of C for 10 minutes, slowly add dilute NaOH solution to the mixture to adjust the pH of the mixture to 8-9; then continue to ultrasonically disperse the mixture for 1 hour to form nickel ions uniformly dispersed in the graphene Dispersion on the surface.

[0026] (2) Heat the above dispersion system in a water bath to 40 o C. Slowly add 11 mL of 5% hydrazine hydrate aqueous solution under continuous stirring. After the addition, continue to stir for 4 hours, filter while hot, wash with water until neutral, and then wash with ethanol twice. The obtained black solid Immediately blow dry with nitrogen, then place in a vacuum oven, and dry at room temperature for 24 hours to obtain graphene-supported nickel nanoparticles.

[0027] (3) Mi...

Embodiment 3

[0031] (1) Add 120 mg nickel chloride (NiCl 2 ·6H 2 O) Dissolved in 60 mL of ethylene glycol / water mixed solvent with a volume ratio of 1:1, then added 800 mg of graphene powder, and the mixture was o After ultrasonic dispersion in a water bath of C for 10 minutes, slowly add dilute NaOH solution to the mixture to adjust the pH of the mixture to 8-9; then continue to ultrasonically disperse the mixture for 1 hour to form nickel ions uniformly dispersed in the graphene Dispersion on the surface.

[0032] (2) Heat the above dispersion system in a water bath to 40 o C. Slowly add 16 mL of 5% hydrazine hydrate aqueous solution under continuous stirring. After the addition, continue to stir for 6 hours, filter while hot, wash with water until neutral, and then wash with ethanol twice, the obtained black solid Immediately blow dry with nitrogen, then place in a vacuum oven, and dry at room temperature for 24 hours to obtain graphene-supported nickel nanoparticles.

[0033] (...

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Abstract

The invention discloses a preparation method of a trace palladium-located catalyst. Meanwhile, the trace palladium-located catalyst has excellent catalytic activity for oxidation of ethanol. The preparation method comprises the following steps: firstly, loading nickel nanoparticles (nano-Ni/GP) with a certain size on the surface of graphene by using a two-dimensional film structure of the graphene; then making the nano-Ni/GP formed in this way react with a palladium chloride solution with a certain concentration, reducing Pd<2+> ions into palladium nanoparticles, oxidizing nickel into Ni<2+> and leaving from the surfaces of the nanoparticles to enter a solution; and performing in-situ uniform deposition on the formed palladium nanoparticles on the surfaces of unreacted nickel nanoparticles so as to form nickel nanoparticle-loaded palladium nanoparticles. Because the palladium nanoparticles are uniformly dispersed on the surfaces of the nickel nanoparticles, the dispersing degree of the palladium is extremely high; however, the palladium loading amount is very small; meanwhile, because the palladium nanoparticles are in mutual contact with the nickel nanoparticles, so-called 'dual-function effect' is formed, so that the electroactivity of the catalyst for the oxidation of ethanol is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a manufacturing method for in-situ deposition of palladium nanoparticles on the surface of nickel nanoparticles loaded on the surface of graphene, and its electroactivity measurement for ethanol oxidation. Background technique [0002] A fuel cell is a highly efficient and novel electrochemical power generation device. It is different from a battery in the conventional sense. When the fuel cell is working, it directly converts chemical energy into electrical energy isothermally and electrochemically. It does not go through the heat engine process, so it is not limited by the Carnot cycle, and the energy conversion efficiency is high (40-60%); it hardly produces NO x and SO x and other harmful gases. Moreover, CO 2 Emissions are also reduced by over 40% compared to conventional power plants. It is precisely because of these outstanding advantages th...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 易清风陈清华
Owner HUNAN UNIV OF SCI & TECH
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