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Preparation method of high-dispersity graphene nano palladium crystal particles

A high-dispersion, graphene technology, applied to electrical components, battery electrodes, circuits, etc., can solve the problems of various processes, affecting the exposure of active sites of Pd nanocrystals, and the large amount of concentrated acid used to achieve a clear mechanism of the preparation process, Excellent electrocatalytic activity and stability, simple and easy preparation method

Pending Publication Date: 2022-02-01
四川烯都科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the van der Waals interaction between graphene layers, the as-prepared material is prone to agglomeration, which affects the exposure of the active sites of Pd nanocrystals.
In addition, the use of graphene as a carrier first requires the preparation of high-quality graphene materials, and there are still many defects and problems in the traditional preparation of graphene.
For example, the production cycle is long and the process is complicated, especially the purification process is extremely tedious and time-consuming; the amount of concentrated acid is large, and waste acid and waste water are produced; the quality of the produced graphene is not high, such as low reduction degree, small specific surface area, and many layers. Wait

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of highly dispersed graphene nano palladium crystal particles, comprising the following steps:

[0027] (1) Pipette 0.5 mL of 0.2 M polyethylene glycol dimethyl ether (NHD) solution and 0.1 mL of 0.05 M PdCl2 solution, and mix them ultrasonically to obtain the NHD-PdII complex solution.

[0028] (2) Add 0.01 g of non-water-expandable graphite oxide and 0.4 mL of formaldehyde (40% wt aqueous solution, the same below) to the NHD-PdII complex solution, and add 6 mL of deionized water.

[0029] (3) Adjust the pH to 10 with 0.1 M KOH solution under stirring, then move it into a hydrothermal reactor; place the reactor in a dry oven at 100 °C to completely react the NHD-PdII complex with the reducing agent formaldehyde, After metal PdII ion loading and reduction, a black precipitate is obtained, which is the target product.

[0030] (4) Then the product is centrifuged, washed, and then placed in a freeze drying oven to dry to obtain the highly dispersed g...

Embodiment 2

[0032] A preparation method of highly dispersed graphene nano palladium crystal particles, comprising the following steps:

[0033] (1) Pipette 1.0 mL of 0.1 M polyethylene glycol dimethyl ether (NHD) and 0.5 mL of 0.05 M PdCl2 solution, and ultrasonically mix to obtain the NHD-PdII complex solution.

[0034] (2) Add 0.05 g of non-water-swellable graphite oxide and 1 mL of formaldehyde (40%) to the NHD-PdII complex solution, and add 5 mL of deionized water.

[0035] (3) Adjust the pH to 11 with 0.1 M KOH solution under stirring, and then move it into a hydrothermal reactor; place the reactor in a dry oven at 80 oC to completely react the NHD-PdII complex with the reducing agent formaldehyde, and the metal After PdII ion loading and reduction, a black precipitate was obtained, which was the target product.

[0036] (4) Then the product is centrifuged, washed, and then placed in a freeze drying oven to dry to obtain the highly dispersed graphene nano-palladium crystal particles...

Embodiment 3

[0038] A preparation method of highly dispersed graphene nano palladium crystal particles, comprising the following steps:

[0039] (1) Pipette 2.0 mL of 0.05 M polyethylene glycol dimethyl ether (NHD) and 1.2 mL of 0.05 M PdCl2 solution, and ultrasonically mix to obtain the NHD-PdII complex solution.

[0040] (2) Add 0.06 g of non-water-swellable graphite oxide and 1.2 mL of formaldehyde (40%) to the NHD-PdII complex solution, and add 6 mL of deionized water.

[0041] (3) Adjust the pH to 11 with 0.1 M KOH solution under stirring, and then move it into a hydrothermal reactor; place the reactor in a dry oven at 100 oC to completely react the NHD-PdII complex with the reducing agent formaldehyde, and the metal After PdII ion loading and reduction, a black precipitate was obtained, which was the target product.

[0042] (4) Then the product is centrifuged, washed, and then placed in a freeze drying oven to dry to obtain the highly dispersed graphene nano-palladium crystal parti...

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PUM

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Abstract

The invention provides a preparation method of high-dispersity graphene nano-palladium crystal particles. According to the scheme, non-water-expanded graphite oxide is prepared on the basis of a classical Hummers method, and the graphite is directly used as a precursor carrier; polyethylene glycol dimethyl ether (NHD) is used as a chelating agent, a dispersing agent and a stabilizing agent, and formaldehyde is used as a reducing agent; and PdCl2 is reduced into nano-palladium crystal particles with uniform size by adopting a hydrothermal method, the nano-palladium crystal particles are highly dispersed on reduced graphene oxide, and graphene is good in dispersity and does not agglomerate. The prepared high-dispersity graphene nano-palladium crystal particles are used as a catalyst, due to the fact that graphene layers are highly dispersed and not stacked, the palladium crystal particles are highly dispersed, small in particle size and uniform in size, and have good reaction activity and stability, and the high-dispersity graphene nano-palladium crystal particles have potential application prospects in the field of direct formic acid fuel cells. The preparation method is simple, economical and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of preparing palladium nanoparticles, in particular to a method for preparing highly dispersed graphene nano-palladium crystal particles. Background technique [0002] Fuel cell is a new type of power generation device, which can directly convert the chemical energy in fuel into electrical energy, and provides an effective solution to energy and environmental problems. Proton exchange membrane fuel cells have a wide range of fuel sources. Not only pure hydrogen can be used, but liquids such as methanol and formic acid can also be used in fuel cells. These fuels not only have a wide range of sources, but are also easy to transport and store. [0003] Among them, formic acid is currently the most widely studied fuel, and it is also the most promising fuel except hydrogen. The study found that direct formic acid fuel cell (DFAFC) has many advantages, such as formic acid is safe, non-toxic, non-flammable, formic acid is ...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/92H01M4/926Y02E60/50
Inventor 夏中均刘学涌郑代芳彭勇邱兴旭
Owner 四川烯都科技有限公司