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Method for fabricating graphene electrode materials through pulsed laser deposition and application thereof

A pulsed laser deposition and graphene electrode technology, applied in the field of electrochemical energy storage, can solve problems such as instability, discontinuity, and obstacles to large-scale utilization of renewable resources

Inactive Publication Date: 2012-08-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its obvious discontinuity and instability hinder the large-scale utilization of renewable resources

Method used

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  • Method for fabricating graphene electrode materials through pulsed laser deposition and application thereof
  • Method for fabricating graphene electrode materials through pulsed laser deposition and application thereof
  • Method for fabricating graphene electrode materials through pulsed laser deposition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Graphene oxide was prepared by the Hummers method. The specific process is briefly described as follows: 5 g of graphite was placed in 120 ml of concentrated sulfuric acid, 2.5 g of sodium nitrate was added, and 15 g of KMnO was slowly added in an ice-water bath. 4 , kept stirring for 30 min, and then slowly added 200 ml of deionized water. Stirring was continued for 15 min. Add about 200 ml of deionized water at 60°C and 30% H 2 o 2 The solution was about 30 ml, the mixture changed from tan to bright yellow, filtered while hot, washed and dried in a vacuum oven at 60°C to obtain graphite oxide. Then graphite oxide was calcined in air atmosphere at 300°C for 10 min to obtain graphene oxide. (Introduce the method in words), after careful grinding, press it into tablets at 10MPa on the tablet machine as the target material;

[0024] (2) Place the pretreated nickel foam and graphene oxide targets in a vacuum chamber, adjust the distance between the target and the s...

Embodiment 2

[0028] (1) Graphene oxide was prepared by the Hummers method (see Example 1 (1) for the specific process), and after careful grinding, it was pressed into tablets at 10 MPa on a tablet machine as a target material;

[0029] (2) Place the pretreated nickel foam and graphene oxide targets in a vacuum chamber, and adjust the distance between the target and the substrate to be 1 cm. Evacuate the vacuum chamber to 10 with mechanical pump and molecular pump -4 Pa;

[0030] (3) Use Nd:YAG pulsed laser to focus the laser beam (wavelength: 1064nm, repetition frequency: 10Hz) onto the cobalt target through the lens and optical window, the high energy of the laser beam melts and evaporates the target plume in an instant, And deposited on the nickel foam substrate, the deposition time is 60min, that is, the graphene electrode material is prepared.

[0031] (4) Turn off the molecular pump, mechanical pump and laser, open the vacuum chamber, take out the substrate, perform characterizatio...

Embodiment 3

[0033] (1) Graphene oxide was prepared by the Hummers method (see Example 1 (1) for the specific process), and after careful grinding, it was pressed into tablets at 10 MPa on a tablet machine as a target material;

[0034] (2) Place the pretreated nickel foam and graphene oxide targets in a vacuum chamber, and adjust the distance between the target and the substrate to be 5 cm. Evacuate the vacuum chamber to 10 with mechanical pump and molecular pump -4 Pa;

[0035] (3) Use Nd:YAG pulsed laser to focus the laser beam (wavelength: 1064nm, repetition frequency: 10Hz) onto the cobalt target through the lens and optical window, the high energy of the laser beam melts and evaporates the target plume in an instant, And deposited on the nickel foam substrate, the deposition time is 60min, that is, the graphene electrode material is prepared.

[0036] (4) Turn off the molecular pump, mechanical pump and laser, open the vacuum chamber, take out the substrate, perform characterizatio...

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Abstract

The invention relates to a method for fabricating graphene electrode materials through pulsed laser deposition and an application thereof. Graphene oxide (GO) is fabricated through the Hummers method, the graphene oxide is compressed into a sheet with thickness of 2 mm, pulse laser ablates the graphene oxide target material, and graphene electrode materials are sputtered and deposited on a nickel foam substrate. The process of the method of fabricating graphene electrode materials does not need any adhesion agent, so that effects of adhesion agents on the capacitance of electrode materials are avoided.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a method for preparing graphene electrode materials by pulsed laser deposition and an application thereof. Background technique [0002] The contradiction between resource scarcity and economic development in today's society has become increasingly prominent, and the development and utilization of renewable resources (solar energy, wind energy, etc.) have attracted much attention. But its obvious discontinuity and instability hinder the large-scale utilization of renewable resources. High-efficiency energy storage devices can make up for this shortfall of renewable resources. As we all know, supercapacitors can effectively improve energy storage and conversion efficiency. It is a new type of energy storage device between conventional capacitors and secondary batteries, and has the advantages of high power density of capacitors and high energy density of ...

Claims

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Application Information

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IPC IPC(8): H01G9/042
Inventor 王雪峰王雅兰王欢文
Owner TONGJI UNIV
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