Method for preparing monodisperse metal atom/graphene composite material employing electrochemical dissolved graphite

A metal atom and composite material technology, which is applied in the field of electrochemically swollen graphite to prepare monodisperse metal atom/graphene composite materials, can solve the problems of difficult to achieve atomic monolayer distribution, prone to agglomeration, and high single atoms.

Active Publication Date: 2017-05-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual catalyst preparation process, due to the high energy of single atoms, agglomeration is prone to occur during calcination or reaction, and it is difficult to achieve a monolayer distribution of atoms.

Method used

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  • Method for preparing monodisperse metal atom/graphene composite material employing electrochemical dissolved graphite
  • Method for preparing monodisperse metal atom/graphene composite material employing electrochemical dissolved graphite
  • Method for preparing monodisperse metal atom/graphene composite material employing electrochemical dissolved graphite

Examples

Experimental program
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Effect test

Embodiment 1

[0112] (1) Put the block graphite directly into a polyethylene bag to make an anode and a cathode. The distance between the anode and cathode was 5 mm, and the average pore size of the polyethylene bag was 0.2 μm. (2) Apply a DC voltage of +5 V to -5 V between the anode and the cathode, electrolyze for 120 h, exchange the electrodes every 30 min, and control the electrolysis temperature at 25 °C. The electrolyte is 10 mg / ml sodium sulfate aqueous solution. The ratio of the electrolyte solution to the total mass of the graphite component in the electrode is 10 ml / g. After electrolysis, a polyethylene bag with a pore size of 10 μm was used to separate the solids from the electrolyte. The solids remain in the bag and the electrolyte is flung out. (3) Disperse the solid obtained by solid-liquid separation in deionized water, using a frequency of 5 KHz, a power density of 100 W, ultrasonication for 10 h, and a temperature of 25 °C. The concentration of the solid in deionized wa...

Embodiment 2

[0114] (1) Put graphite plates directly into polypropylene bags to make anode and cathode. The distance between the anode and cathode was 5 mm, and the average pore size of the polypropylene bag was 0.2 μm. (2) Apply a DC voltage of +5 V to -5 V between the anode and the cathode, electrolyze for 120 h, exchange the electrodes every 30 min, and control the electrolysis temperature at 25 °C. The electrolyte is 50 mg / ml magnesium nitrate aqueous solution. The ratio of the electrolyte solution to the total mass of the graphite component in the electrode is 10 ml / g. After electrolysis, a polyethylene bag with a pore size of 10 μm was used to separate the solids from the electrolyte. The solids remain in the bag and the electrolyte is flung out. (3) Disperse the solid obtained by solid-liquid separation in deionized water to form a slurry, and the concentration of the slurry is 10 mg / ml. Then 50.0 g of agate ball milling balls with a diameter of 1-1.3 cm were sealed together wit...

Embodiment 3

[0116] (1) Put graphite rods directly into polystyrene bags to make anode and cathode. The distance between the anode and cathode was 5 mm, and the average pore size of the polystyrene bag was 0.2 μm. (2) Apply a DC voltage of +5 V to -5 V between the anode and the cathode, electrolyze for 120 h, exchange the electrodes every 30 min, and control the electrolysis temperature at 25 °C. The electrolyte is 100 mg / ml calcium chloride aqueous solution. The ratio of the electrolyte solution to the total mass of the graphite component in the electrode is 10 ml / g. After electrolysis, a polystyrene bag with a pore size of 10 μm was used to separate the solids from the electrolyte. The solids remain in the bag and the electrolyte is flung out. (3) Disperse the solid obtained by solid-liquid separation in deionized water to form a slurry, and the concentration of the slurry is 1 mg / ml. 1500.0 g of zirconia ball milling balls with a diameter of 3-8 mm were sealed together with the slur...

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Abstract

The invention discloses a method for preparing a monodisperse metal atom / graphene composite material employing electrochemical dissolved graphite. The method comprises the steps of (1) preparing an electrode from a graphite-based material; (2) electrolyzing the prepared electrode in an electrolytic cell, carrying out solid-liquid separation and recycling an electrolyte; (3) further stripping the solid obtained by separation and carrying out solid-liquid separation to obtain a crude monodisperse metal atom / graphene composite material; (4) separating and purifying the crude monodisperse metal atom / graphene composite material; and (5) carrying out thermal treatment on the composite material obtained in the step (4) under inert atmosphere protection and cooling and drying the material to obtain a monodisperse metal atom / graphene composite catalyst. The preparation method is simple in process steps, high in efficiency and low in energy consumption, and massive production can be achieved.

Description

technical field [0001] The invention relates to a method for preparing a monodisperse metal atom / graphene composite material by electrochemically swelling graphite, and belongs to the technical field of chemical catalysis. Background technique [0002] Energy shortage and environmental pollution are two major world problems facing mankind today. With the coming of the energy crisis, the development of new energy has become the most urgent and important strategic demand in the world. At present, the new sustainable energy sources that people are developing and utilizing include solar energy, wind energy, water energy, nuclear energy, fuel cell metal-air battery, etc. (EnergyEnviron. Sci. 2016, 9, 357-390, Chem. Soc. Rev. 2016 , 45, 517-531). Among them, metal-air batteries and fuel cells, such as proton exchange membrane fuel cells and direct methanol fuel cells, are devices that convert chemical energy into electrical energy through electrochemical reactions. Without the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B01J21/18B01J23/00
CPCB01J21/18B01J21/185B01J23/00H01M4/8825H01M4/9041H01M4/9091Y02E60/50
Inventor 王俊中王俊英
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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