Reduced graphene oxide/manganese oxide compound and preparation method thereof

A technology of composites and nanocomposites, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve problems that have not attracted the attention of scientific researchers

Active Publication Date: 2017-08-29
深圳凯烽达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, starting from the manganese source added during the synthesis of graphene oxide without adding additional manganese source to synthesize manganese oxide / graphene composites with coexistence of multiple valence states has not attracted the attention of scientific researchers.

Method used

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  • Reduced graphene oxide/manganese oxide compound and preparation method thereof
  • Reduced graphene oxide/manganese oxide compound and preparation method thereof
  • Reduced graphene oxide/manganese oxide compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A rGO / MnO x The preparation method of nanocomposite, the steps are as follows:

[0071] (1) Mix 1 g of expanded graphite and 20 mL of concentrated sulfuric acid, and stir the mixture at 0 °C for 12 h to obtain a mixed solution A.

[0072] (2) Add 3 g of potassium permanganate to the mixed solution A. After the addition is complete, stir at 0 °C for 2 h, then at 40 °C for 1 h to obtain the mixed solution B.

[0073] (3) Carefully add 120 mL of warm water at 70 °C to the mixture B, and then add 30 mL of 30 wt% hydrogen peroxide to obtain a bright yellow GO sol.

[0074] (4) Add potassium hydroxide aqueous solution dropwise to the GO sol under stirring, adjust the pH of the GO sol to 3, centrifuge, wash and centrifuge the pH-adjusted GO sol, repeat the operation 3 times to obtain solid C, and freeze the solid C Dry (‒(40‒50) °C, < 200Pa) to obtain solid D.

[0075] (5) The solid D was heat-treated at 450 °C for 2 h under a nitrogen atmosphere, and then naturally cooled ...

Embodiment 2

[0077] A rGO / MnO x The preparation method of nanocomposite, the steps are as follows:

[0078] (1) Mix 1 g of expanded graphite and 20 mL of concentrated sulfuric acid, and stir the mixture at 2 °C for 12 h to obtain a mixed solution A.

[0079] (2) Add 3 g of potassium permanganate to the mixed solution A. After the addition is complete, stir at 2 °C for 2 h, then at 40 °C for 1 h to obtain the mixed solution B.

[0080] (3) Carefully add 150 mL of warm water at 60 °C to the mixture B, and then add 20 mL of 30 wt% hydrogen peroxide to obtain a bright yellow GO sol.

[0081] (4) Add sodium hydroxide aqueous solution dropwise to the GO sol under stirring, adjust the pH of the GO sol to 5, centrifuge, wash and centrifuge the pH-adjusted GO sol, repeat the operation twice to obtain solid C, and freeze the solid C Dry (‒(40‒50) °C, < 200Pa) to obtain solid D.

[0082] (5) The solid D was heat-treated at 450 °C for 2 h under a nitrogen atmosphere, and then naturally cooled to ro...

Embodiment 3

[0084] A rGO / MnO x The preparation method of nanocomposite, the steps are as follows:

[0085] (1) Mix 1 g of expanded graphite and 20 mL of concentrated sulfuric acid, and stir the mixture at 0 °C for 12 h to obtain a mixed solution A.

[0086] (2) Add 4 g of potassium permanganate to the mixed solution A. After the addition is complete, stir at 0 °C for 2 h, then at 40 °C for 1 h to obtain the mixed solution B.

[0087] (3) Carefully add 180 mL of warm water at 60 °C to the mixture B, and then add 20 mL of 30 wt% hydrogen peroxide to obtain a bright yellow GO sol.

[0088] (4) Add ethylamine aqueous solution dropwise to the GO sol under stirring, adjust the pH of the GO sol to 7, centrifuge, wash and centrifuge the pH-adjusted GO sol, repeat the operation twice to obtain solid C, and freeze-dry the solid C (‒(40‒50) °C, < 200 Pa), to obtain solid D.

[0089] (5) The solid D was heat-treated at 450 °C for 2 h under a nitrogen atmosphere, and then naturally cooled to room t...

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Abstract

The invention relates to a reduced graphene oxide / manganese oxide compound and a preparation method thereof, and belongs to the technical field of preparation of nano-compound materials and super-capacitor electrode materials. An rGO / MnO<x> nano-compound is composed of an rGO nanosheet and MnO<x> particles embedded on the nanosheet; the size of the MnO<x> particles is 10-90 nm; x in the MnO<x> is 1.33-2; the mass percentage content of the MnO<x> is 20-40%; and the MnO<x> component is a mixture that MnO<2>, Mn<3>O<4> and Mn<2>O<3> coexist. The invention further provides a preparation method of the reduced graphene oxide / manganese oxide compound and the purpose therefore, used for the electrode material of a super-capacitor. An rGO / MnO<x> nano-compound synthesis method is simple and low in cost; scale industrial production is facilitated; and the rGO / MnO<x> nano-compound has relatively high specific discharge capacity and good rate capability, and is suitable for being used as the electrode material of the super-capacitor.

Description

technical field [0001] The invention relates to a reduced graphene oxide / manganese oxide composite and a preparation method thereof, belonging to the technical field of preparation of nanocomposite materials and supercapacitor electrode materials. Background technique [0002] Since its discovery in 2004, graphene has attracted extensive attention from researchers due to its excellent mechanical, electronic, and physical and chemical properties ( science , 2004, 306, 666–669). So far, people have developed a variety of methods to prepare graphene, such as graphite exfoliation method, chemical vapor deposition method, arc discharge method, solvothermal method and graphene oxide reduction method ( Nat. Nanotechnol. , 2008, 3, 563‒668; science , 2009, 324, 1312–1314; Angew. Chem. Int. Ed. , 2014, 53, 2398–2401; Energy Environ. Sci. , 2013, 6, 1185–1191.), among which the graphene oxide reduction method is the most common, because the method is simple, low in cost, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86
CPCY02E60/13H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86
Inventor 盖利刚栾振红姜海辉班青
Owner 深圳凯烽达科技有限公司
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