Palladium/graphene nano electro-catalyst and preparation method thereof

An electrocatalyst, graphite nanosheet technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Reduce and affect the electrocatalytic performance of catalysts, etc., to achieve the effect of energy saving and efficiency

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hydrogen and methanol, as fuel for fuel cells, have the following disadvantages: the storage and transportation of hydrogen are difficult; although methanol is easy to store and has a high energy density, methanol is toxic and volatile, and is easy to pass through. The Nafion membrane permeates from the cathode to the anode, reducing the effective working voltage and energy density of the battery
However, polymers are used as protective agents for noble metal nanoparticles in the above-mentioned polyol method and microwave polyol method, and it is difficult for metal nanoparticles protected by such polymers to be directly loaded on carbon supports.
At the same time, as an application in the field of electrocatalyst, the polymer protective agent must be removed at high temperature, and the metal nanoparticles will reunite during high temperature treatment, which will affect the electrocatalytic performance of the catalyst.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Disperse 190mg of graphite oxide nanosheets in 400mL of ethylene glycol by ultrasonic treatment, then add 8mL of 0.05M palladium chloride solution and 2.0mL of 1.0mol / L sodium acetate solution, and stir and mix well. 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 / graphene nanometer electrocatalyst. The palladium nano-particles in the palladium / graphene nano-electrocatalyst are highly dispersed on the graphene nano-sheets, and have a uniform particle size, with an average particle size of 3.3 nm. EDX analysis showed that the mass fraction of palladium in the catalyst was 19.8%, close to the theoretical value of 20%.

[0021] As a comparison, use XC-72 nano-carbon and carbon nanotubes (carbon nanotubes with a diameter of 30-40nm, pretreated with concentrate...

Embodiment 2

[0024] Disperse 400mg of graphite oxide nanosheets in 300mL of ethylene glycol by ultrasonic treatment, then add 42mL of 0.05M palladium acetate solution and 3.5mL of 1.0mol / L sodium acetate solution, and stir and 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 Pd / graphene nanometer electrocatalyst. The palladium nanoparticles in the Pd / graphene nano-electrocatalyst are highly dispersed on the graphene nano-sheets and have a uniform particle size, with an average particle size of 3.5 nm. EDX analysis showed that the mass fraction of palladium in the catalyst was 39.6%, close to the theoretical value of 40%. .

[0025] As a comparison, use XC-72 nano-carbon and carbon nanotubes as supports respectively, and synthesize Pd / XC-72 nanometer electrocatalyst (the mass...

Embodiment 3

[0028] Disperse 310mg of graphite oxide nanosheets in 300mL of ethylene glycol by ultrasonic treatment, then add 5.5mL of 0.05M palladium acetate solution and 1mL of 1.0mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 8 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a Pd / graphene nano-electrocatalyst. The palladium nanoparticles in the Pd / graphene nano-electrocatalyst are highly dispersed on the graphene nano-sheets with a uniform particle size, and the average particle size is 3.1 nm. EDX analysis showed that the mass fraction of palladium in the catalyst was 10.4%, close to the theoretical value of 20%.

[0029] As a comparison, use XC-72 nano-carbon and carbon nanotubes as supports respectively, and synthesize Pd / XC-72 nanometer electrocatalyst (the mass fraction of palladium is 10%) and Pd / CNTs na...

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Abstract

The invention discloses a palladium / graphene nano electro-catalyst which takes graphene as a carrier and palladium as an active component, wherein the mass fraction of the palladium in the catalyst is 10 to 40 percent. A preparation method of the palladium / graphene nano electro-catalyst comprises the following steps of: (1) ultrasonically dispersing graphite oxide nano sheets in liquid polyalcohol, then adding a palladium salt solution and a sodium acetate solution, and fully and evenly mixing, wherein the content of the graphene oxide nano sheets in the mixture is 0.48 to 1.3g / L, the concentration of palladium salts is 0.0005 to 0.005mol / L, and the sodium acetate concentration is 0.0033 to 0.012mol / L; and (2) transferring the mixture into a microwave hydro-thermal reaction kettle, carrying out microwave heating and reacting for 5 to 10 minutes, then filtering, washing and drying to obtain the palladium / graphene nano electro-catalyst. The preparation method has the advantages of energy saving, high speed, simple process, and the like; and palladium nanoparticles in the prepared palladium / graphene nano electro-catalyst have even particle sizes. The catalyst has high electro-catalysis activity to formic electrooxidation and has wide application in fuel cells.

Description

technical field [0001] The invention relates to a palladium / graphene nano electrocatalyst and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells using hydrogen as fuel and direct alcohol fuel cells using methanol as fuel have been extensively studied in recent decades. However, hydrogen and methanol, as fuel for fuel cells, have the following disadvantages: the storage and transportation of hydrogen are difficult; although methanol is easy to store and has a high energy density, methanol is toxic and volatile, and is easy to pass through. The Nafion membrane permeates from the cathode to the anode, reducing the effective working voltage and energy density 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. First of all, the permeability of formic acid through Nafion membrane is two orders of magnitude lower than that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/44H01M4/88
CPCY02E60/50
Inventor 陈卫祥赵杰常焜马琳李辉
Owner ZHEJIANG UNIV
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