Manufacturing method of graphene/manganese dioxide super-capacitor electrode

A supercapacitor electrode, manganese dioxide technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, chemical instruments and methods, etc. effect and other problems, to achieve the effects of increasing capacitance, charge and discharge efficiency, increasing specific surface area, and strong mechanical strength

Active Publication Date: 2019-12-03
王习宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the synthesis of manganese dioxide/graphene composites is usually carried out in aqueous solution, but due to the poor wettability of manganese dioxide and carbon and the high surface energy of nanoparticles, it is difficult to enter the nanostructured manganese dioxide soluble salt. Between the layers of graphene, they tend to cluster in water instead of combining with graphene, which leads to the fact that the nanostructured manganese dioxide cannot contact the electrolyte and cannot produce a pseudocapacitive effect
The inability to produce pseudocapacitive ef

Method used

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  • Manufacturing method of graphene/manganese dioxide super-capacitor electrode
  • Manufacturing method of graphene/manganese dioxide super-capacitor electrode
  • Manufacturing method of graphene/manganese dioxide super-capacitor electrode

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Experimental program
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Effect test

Embodiment 1

[0043] A kind of preparation method of graphene / manganese dioxide supercapacitor electrode, comprises the steps:

[0044] Step 1, mix:

[0045] (1) First weigh 2g of manganese sulfate (MnSO 4 ), 2g phosphorus pentoxide (P 2 o 5 ), 2g ferric chloride (FeCl 3 ), 1g sodium nitrate (NaNO 3 ) obtain mixture with 2g graphite, and seal up in dry box; Described graphite is 250 order graphite flakes;

[0046] (2) in the magnetic stirring water bath, will contain 20g mass fraction and be 95% concentrated sulfuric acid (H 2 SO 4 ) in a three-necked flask heated to 70°C, then slowly add the medicines weighed in the step (1) into the concentrated sulfuric acid successively, carry out magnetic stirring and the reaction time is 20min, and obtain the pre-oxidized graphite suspension;

[0047] (3) Move the pre-oxidized graphite suspension, that is, the three-necked flask filled with the reactants to the ice-water bath prepared in advance, and wait for the reaction solution to be cooled ...

Embodiment 2

[0055] A kind of preparation method of graphene / manganese dioxide supercapacitor electrode, comprises the steps:

[0056] Step 1, mix:

[0057] (1) First weigh 2g of manganese sulfate (MnSO 4 ), 2g phosphorus pentoxide (P 2 o 5 ), 2g ferric chloride (FeCl 3 ), 1g sodium nitrate (NaNO 3 ) is mixed with 2g graphite to obtain the mixture, and sealed in a dry box; the graphite is 200 mesh flake graphite;

[0058] (2) in the magnetic stirring water bath, will contain 20g mass fraction and be 96% concentrated sulfuric acid (H 2 SO 4 ) in a three-necked flask heated to 75°C, then slowly add the medicines weighed in the step (1) into concentrated sulfuric acid successively, and carry out magnetic stirring for 25 minutes to obtain a pre-oxidized graphite suspension;

[0059] (3) Move the pre-oxidized graphite suspension, that is, the three-necked flask filled with reactants to a pre-prepared ice-water bath, and wait for the reaction solution to be cooled to 8 ° C. Under stirring...

Embodiment 3

[0068] A kind of preparation method of graphene / manganese dioxide supercapacitor electrode, comprises the steps:

[0069] Step 1, mix:

[0070] (1) First weigh 2g of manganese sulfate (MnSO 4 ), 2g phosphorus pentoxide (P 2 o 5 ), 2g ferric chloride (FeCl 3 ), 1g sodium nitrate (NaNO 3 ) obtain mixture with 2g graphite, and seal up in dry box; Described graphite is 300 order graphite flakes;

[0071] (2) in the magnetic stirring water bath, will contain 20g mass fraction and be 97% concentrated sulfuric acid (H 2 SO 4 ) in a three-necked flask heated to 90°C, then slowly add the medicines weighed in the step (1) into the concentrated sulfuric acid successively, carry out magnetic stirring and the reaction time is 60min, and obtain the pre-oxidized graphite suspension;

[0072] (3) Move the pre-oxidized graphite suspension, that is, the three-necked flask containing the reactants to the ice-water bath prepared in advance, and wait for the reaction solution to cool to 7°C...

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Abstract

A manufacturing method of a graphene/manganese dioxide super-capacitor electrode belongs to the functional carbon material manufacturing field. The manufacturing method comprises the following steps of manufacturing a graphene/manganese dioxide compound without a template and other surfactants, wherein the graphene/manganese dioxide compound is composed of the graphene and manganese dioxide nanoparticles uniformly loaded between graphene layers, and a diameter of the manganese dioxide nanoparticles is 10-20 nm; and then manufacturing the graphene/manganese dioxide compound into a super-capacitor electrode. The graphene/manganese dioxide supercapacitor electrode manufactured in the method is placed in a 1mol/L NaSO4 electrolyte. A capacitance of a super capacitor measured under a 1.6 V potential window is 380-540F/g, and the capacitance is 85-90% of an initial value after 1000 cycles under 100mV/s.

Description

technical field [0001] The invention belongs to the field of preparation of functional carbon materials, in particular to a preparation method of a graphene / manganese dioxide super capacitor electrode. Background technique [0002] Because supercapacitors have the advantages of high power density, excellent cycle life, good memory-free effect, and low maintenance costs, they can be used as devices to replace batteries in new energy storage. Due to graphene's unique two-dimensional structure and inherent physical properties (exceptionally high electrical conductivity and large surface area), graphene-based materials have great potential for applications in supercapacitors. [0003] Graphene is a two-dimensional sp 2- Hybrid carbon sheet, because of its very good theoretical high specific surface area, low density, good chemical stability and high conductivity, can be used as a supercapacitor. The ultra-thin graphene wall can form a three-dimensional graphene structure, and ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36H01G11/46C01G45/02B82Y30/00C01B32/198
CPCH01G11/86H01G11/24H01G11/30H01G11/36H01G11/46C01G45/02B82Y30/00C01B32/198C01P2002/72C01P2004/04C01P2002/82C01P2004/64Y02E60/13
Inventor 王习宇
Owner 王习宇
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