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Monodisperse metal atom/graphene composite catalyst and preparation method and application thereof

A graphene composite and metal atom technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Reunion, monatomic higher problems

Active Publication Date: 2017-05-24
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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  • Monodisperse metal atom/graphene composite catalyst and preparation method and application thereof
  • Monodisperse metal atom/graphene composite catalyst and preparation method and application thereof
  • Monodisperse metal atom/graphene composite catalyst and preparation method and application thereof

Examples

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Embodiment 1

[0116] (1) Using polytetrafluoroethylene (PTFE) as a binder, the sulfur-doped graphene powder was pressed into a self-supporting columnar electrode as the anode and cathode, and the thickness of the anode and cathode were both 5 mm. The mass ratio of PTFE to sulfur-doped graphene powder was 0.05 g / g. Both the anode and the cathode contain more than 50% graphite by mass, with a resistivity of 0.3 kohm·m (0.3 KΩ·m), pores, and a specific surface area of ​​4 square meters per gram (4 m 2 / g). The pressure of pressing the electrode is 45 MPa, and the temperature is 80 °C. Two types of electrodes, anode and cathode, form an array. The distance between anode and cathode is 1 mm). The anode and cathode are separated by polyethylene film. The polyethylene bags have an average pore size of 10 µm. (2) Apply a DC voltage of +8 V to -8 V between the anode and the cathode, electrolyze for 60 h, exchange the electrodes every 3 h, and control the electrolysis temperature at 40 °C. The ...

Embodiment 2

[0118] (1) Using polytetrafluoroethylene (PTFE) as a binder, the phosphorus-sulfur-doped graphene powder was pressed into a self-supporting columnar electrode as the anode and cathode, and the thickness of the anode and cathode were both 5 mm. The mass ratio of PTFE to phosphorus-sulfur-doped graphene powder is 0.05 g / g. Both the anode and the cathode contain more than 50% graphite by mass, with a resistivity of 0.3 kohm·m (0.3KΩ·m), pores, and a specific surface area of ​​4 square meters per gram (4 m 2 / g). The pressure of pressing the electrode is 45 MPa, and the temperature is 80 °C. Two types of electrodes, anode and cathode, form an array. The distance between anode and cathode is 1 mm. The anode and cathode are separated by polypropylene film. The polypropylene bags have an average pore size of 10 µm. (2) Apply a DC voltage of +8 V to -8 V between the anode and the cathode, electrolyze for 60 h, exchange the electrodes every 3 h, and control the electrolysis tempera...

Embodiment 3

[0120] (1) Using polytetrafluoroethylene (PTFE) as a binder, the phosphorus-sulfur-boron-doped graphene powder was pressed into a self-supporting columnar electrode as the anode and cathode, and the thickness of the anode and cathode were both 5 mm. The mass ratio of PTFE to phosphorus-sulfur-boron-doped graphene powder is 0.05 g / g. Both the anode and the cathode contain more than 50% graphite by mass, with a resistivity of 0.3 kohm•m (0.3 KΩ•m), pores, and a specific surface area of ​​4 square meters per gram (4 m2 / g). The pressure of pressing the electrode is 45 MPa, and the temperature is 80 °C. Two types of electrodes, anode and cathode, form an array. The distance between anode and cathode is 1 mm. The anode and cathode are separated by polyethylene film. The polyethylene bags have an average pore size of 10 µm. (2) Apply an AC voltage of 10 V between the anode and the cathode, electrolyze for 30 h, and change the direction of the current every 30 min. The electrolys...

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Abstract

The invention discloses a monodisperse metal atom / graphene composite catalyst and a preparation method and application thereof. The catalyst is formed by loading monodisperse metal atoms on / in graphene, wherein the content of the monodisperse metal atoms is 0.0001wt%-5.0wt%; the content of heteroatom doped graphene is 95wt%-99.9999wt%; and the content of heteroatom in graphene is 0wt%-90wt%. The monodisperse metal atom / graphene composite catalyst is obtained through an electrochemical method, and the preparation method is simple, easy to operate and control, low in cost, high in efficiency, good in quality, high in security and favorable for industrial production. The composite catalyst has the characteristics of high activity and good stability when being applied to electro-catalytic oxygen reduction, and has better comprehensive performance and good application prospects relative to commercial 20wt% of Pt / C.

Description

technical field [0001] The invention relates to a monodisperse metal atom / graphene composite catalyst and its preparation method and application, belonging 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 need for combustion, ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J27/24B01J23/00B01J37/34H01M4/88H01M4/90
CPCH01M4/8825H01M4/9041B01J23/00B01J27/22B01J27/24B01J37/342B01J35/33Y02E60/50
Inventor 王俊英王俊中
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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