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High electrochemistry capacitance oxidization plumbago alkene, low-temperature preparation method and uses

An electrochemical and graphene technology, applied in the field of high electrochemical capacity graphene oxide and its low-temperature preparation, and new electrode materials, to achieve the effects of easy operation, low energy consumption, and low preparation temperature

Active Publication Date: 2009-02-18
深圳清研紫光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing preparation method of graphene oxide is mainly high-temperature rapid expansion method. The main process is to use graphite oxide as raw material, and through rapid heating to 1000 ° C, in the presence of protective gas, the sheets of graphite oxide are separated from each other to obtain A new type of carbon material with a certain specific surface area, but so far there is no report on the use of graphene oxide as an electrode material for supercapacitors

Method used

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  • High electrochemistry capacitance oxidization plumbago alkene, low-temperature preparation method and uses

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Mix 2g of graphite powder and 1g of sodium nitrate with 46mL of concentrated sulfuric acid (98% mass concentration), stir in an ice-water bath, and slowly add 6g of KMnO 4 , reacted for 2h, and then transferred it to a constant temperature water bath at 35°C, and reacted for 30min. Gradually add 92 mL of deionized water, the temperature rises to 98 ° C and continue to react for 3 h, then take it out from the water bath, further add deionized water to dilute, and dilute with 20 mL of 30% H 2 o 2 Solution treatment to neutralize unreacted permanganate. Centrifuge and filter while hot, wash the filter cake repeatedly with deionized water, and dry in vacuum at 50°C for 48 hours to obtain graphite oxide.

[0013] Put the dried graphite oxide into the sample tube, start vacuuming, the vacuum degree is 10Pa, and start heating at the same time, the heating rate is 20°C / min, the temperature is raised to 200°C, and maintained for 10h to obtain graphene oxide. Utilize nitrogen ...

Embodiment 2

[0017] Mix 10g of graphite powder and 5g of sodium nitrate with 230mL of concentrated sulfuric acid (mass fraction 98%), stir in an ice-water bath, and slowly add 30g of KMnO 4 , reacted for 2h, and then transferred to a 35°C water bath for 30min. Gradually add 460mL deionized water, the temperature rises to 98°C and continue to react for 40min, take it out from the water bath and further dilute with deionized water, and dilute with 20mL mass fraction 30% H 2 o 2 Solution treatment to neutralize unreacted permanganate. Centrifuge and filter while hot, wash the filter cake repeatedly with deionized water, and dry in vacuum at 50°C for 48 hours to obtain graphite oxide.

[0018] Put the dried graphite oxide into the sample tube, start vacuuming, the vacuum degree is 200Pa, and start heating at the same time, the heating rate is 10°C / min, the temperature is raised to 200°C, and maintained for 8h to obtain graphene oxide. Utilize the specific surface of the sample obtained by n...

Embodiment 3

[0022] Mix 4g of graphite powder and 2g of sodium nitrate with 92mL of concentrated sulfuric acid (mass fraction 98%), stir in an ice-water bath, and slowly add 12g of KMnO 4 , reacted for 2h, and then transferred to a 35°C water bath for 30min. Gradually add 184mL deionized water, the temperature rises to 98°C and continue to react for 3h, take it out from the water bath and further dilute with deionized water, and dilute with 20mL mass fraction 30% H 2 o 2 Solution treatment to neutralize unreacted permanganate. Centrifuge and filter while hot, wash the filter cake repeatedly with deionized water, and dry in vacuum at 50°C for 48 hours to obtain graphite oxide.

[0023] Put the dried graphite oxide into the sample tube, start vacuuming, the vacuum degree is 100Pa, and start heating at the same time, the heating rate is 10°C / min, the temperature is raised to 300°C, and maintained for 15h to obtain graphene oxide. Utilize the specific surface area of ​​the sample obtained b...

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Abstract

The invention discloses a high electrochemical capacity graphene oxide, and a method for preparing the high electrochemical capacity graphene oxide, and the application thereof. The lamina thickness of the graphene oxide is 0.35 to 20 nm; the specific surface area is 200 to 800 square meters per gram, and the electrochemical specific capacity reaches 50 to 220 F / g. The present invention relates to the method that graphite oxide is heated to 150 to 600 DEG C and is maintained at the temperature for 0.5 to 20 hours in a high vacuum to get the graphene oxide. The material is applied to the electrode material of the super capacitor. The invention has the advantages of simple preparation process, low preparation temperature, easy operation and low energy consumption.

Description

technical field [0001] The invention relates to a graphene oxide with high electrochemical capacity and its low-temperature preparation method and application, belonging to new electrode material technology. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered in recent years. It is a single-layer or multi-layer extremely thin graphite material. It is currently one of the research hotspots in the field of carbonaceous materials and condensed matter physics. Graphene is the construction of zero-dimensional fullerene, one-dimensional carbon nanotubes, three-dimensional bulk graphite and other Sp 2 The basic structural unit of hybrid carbon. Graphene has many strange properties. Graphene is a substance without an energy gap, showing metallicity; in single-layer graphene, each carbon atom has an unbonded electron, so it has very good conductivity; holes and electrons in graphene Separation from each other leads to the creation of new elec...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 杨全红吕伟孙辉
Owner 深圳清研紫光科技有限公司
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