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High-purity graphene as well as preparation method and application thereof

A graphene, high-purity technology, applied in graphene, chemical instruments and methods, carbon-silicon compound conductors, etc., to achieve the effects of high conductivity, low cost, and large size

Inactive Publication Date: 2022-03-18
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Have not seen the method for preparing high-purity graphene under the electrolytic process that utilizes tetrabutylammonium hydrogen sulfate to regulate the pH value of the sulfate solution to alkaline conditions as yet.

Method used

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  • High-purity graphene as well as preparation method and application thereof
  • High-purity graphene as well as preparation method and application thereof
  • High-purity graphene as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation method of high purity graphene, comprising the steps of:

[0035] (1) Press the graphite foil to a graphite sheet A having a thickness of 3 mm, as an electrolytic positive electrode; select the a negative electrode of the platinum electrode as electrolysis; the ammonium sulfate is selected into 1.3 mol / L of ammonium sulfate solution B, as an electrolyte, the electrolyte The device is placed at a constant temperature environment at a temperature of 0 ° C, and at a 3V DC voltage, stabilizes for 0.3 h;

[0036] (2) 5 ml of 6 wt% of the tetrabutylammonium sulfate sulfate ammonium sulfate was 13% by weight of the pH of 13 ml of ammonium sulfate, and the mixture was stirred at room temperature (25 ° C) at room temperature (25 ° C). Ultrasound is less than 5 minutes to obtain an alkaline electrolyte C; transfer the electrode of step (1) to the alkaline electrolyte solution C, the voltage is stabilized at 12V, continuously energizing 2 h, at the bottom of the alkaline...

Embodiment 2

[0047] Preparation method of high purity graphene, comprising the steps of:

[0048] (1) Press the graphite foil to a graphite sheet A having a thickness of 2 mm, as an electrolytic positive electrode; select the copolymer of the platinum electrode as an electrolysis; sodium sulfate is selected from 2 mol / L sulfate solution B, as an electrolyte, electrolyte device Placed at a constant temperature environment at 0 ° C, at a DC voltage of 1V, stabilizes for 1 h;

[0049] (2) The pH of the sodium sulfate solution B was added to the sulfate solution B was added to the ammonium sulfate solution B, and the mixture was stirred for 15 minutes at room temperature (25 ° C) at room temperature (25 ° C). Ultrasound is less than 5 minutes to obtain an alkaline electrolyte C; transfer the electrode of step (1) to the alkaline electrolyte solution C, the voltage is stabilized at 10V, continuously transmitting 1.5 h, at the bottom of the alkaline electrolyte C to obtain precipitation D;

[0050...

Embodiment 3

[0060] Preparation method of high purity graphene, comprising the steps of:

[0061] (1) Press the graphite foil to a graphite sheet A having a thickness of 2.5 mm, as an electrolytic positive electrode; select the copolymer of the platinum electrode as an electrolytic electrolysis; the ammonium sulfate is selected into 1.5 mol / L of ammonium sulfate solution B, as an electrolyte, Place the electrolyte device at a constant temperature environment at a constant temperature environment at a 2.7V DC voltage, stable to maintain 3 h;

[0062] (2) The pH of the sulfate solution B was adjacent to the sulfate solution B was added to the ammonium sulfate solution B, and the mixture was stirred at room temperature for 15 minutes, and at room temperature (25 ° C) at room temperature (25 ° C) The 50W power is less than 5 minutes to obtain a basic electrolyte C; transfer the electrode of step (1) to the alkaline electrolyte solution C, the voltage is stabilized at 15V, continuously energizing...

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Abstract

The method comprises the following steps: (1) taking a graphite sheet A as a positive electrode, a platinum electrode as a negative electrode and a sulfate solution B as an electrolyte, and keeping for 0.3-3 hours under the direct current voltage of 1-5V; (2) the electrolyte is replaced with a weakly alkaline electrolyte C, the voltage is adjusted to be 5-30 V, electrification continues to be conducted for 0.5-5 h, a precipitate D is obtained, and the weakly alkaline electrolyte is obtained by adjusting the pH value of the sulfate solution to be 8-14 through tetrabutylammonium hydrogen sulfate; (3) dissolving the precipitate D obtained in the step (2) in an organic solvent, and performing ultrasonic treatment to obtain a solution E; centrifuging the solution E, and performing suction filtration and cleaning on the supernatant with deionized water to obtain a separated solid; and (4) drying the solid separated in the step (3) to obtain the high-purity graphene. The obtained graphene has a low degree of oxidation, a small number of layers and a large size.

Description

Technical field [0001] The present invention is belonging to the field of graphene, particularly with respect to a high-purity graphene and a preparation method thereof. Background technique [0002] Low-cost scale preparation High purity graphene is an excellent conductive and thermal conductivity of graphene, which pushes graphene, which must be solved in the fields of electric heating, sensing, and energy storage. The most important technical route of high-purity graphene is prepared by cheap graphite is the preparation of high-purity graphene. For this technology route, high purity is a premise of achieving various applications, while also taking into account the environmental and safety of preparation systems and processes. However, development of high purity, high yield, environmentally friendly preparation strategy is still facing challenges, and improves the low-cost scale preparation of high-purity graphene by principle innovation and process technology. The low-cost sca...

Claims

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Application Information

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IPC IPC(8): C01B32/19H01B1/04H01M4/583C09K5/14
CPCC01B32/19H01B1/04H01M4/583C09K5/14C01B2204/32C01B2204/04
Inventor 陈杰陈文苗徐春宇王凡骆艳华裴晓东
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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