Mesoporous manganese dioxide material, preparation method thereof and supercapacitor

A manganese dioxide and mesoporous technology, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of complicated operation and complicated process, and achieve the effect of large BET specific surface area, simple preparation method and high specific capacitance per unit specific surface area.

Inactive Publication Date: 2012-11-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

The Chinese patent document with the application number 200810150714.5 discloses a manganese dioxide mesoporous material and its preparation method. First, Na-type layered manganese oxide is prepared from manganese nitrate, sodium hydroxide and hydrogen peroxide; Type layered manganese dioxide reacts with hydrochloric acid to obtain H-type layered manganese dioxide; then use tetramethylammonium hydroxide to peel off the H-type layered manganese dioxide, prepare manganese dioxide nano-layer sol solution, and add Divalent manganese salt soluble in water, after the reaction, the layered manganese oxide intercalated by divalent manganese particles is obtained; adding inorganic alkali and hydrogen peroxide to oxidize the layered manganese oxide intercalated by the divalent manganese ions, and the The obtained manganese dioxide pillared layered manganese oxide is roasted to obtain the manganese dioxide mesoporous material. This method is not only complicated in process and cumbersome in operation, but also the specific surface area of ​​the obtained manganese dioxide mesoporous material can only be increased to 80m 2 / g~120m 2 / g

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  • Mesoporous manganese dioxide material, preparation method thereof and supercapacitor
  • Mesoporous manganese dioxide material, preparation method thereof and supercapacitor
  • Mesoporous manganese dioxide material, preparation method thereof and supercapacitor

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[0038] The present invention also provides a preparation method of mesoporous manganese dioxide material, comprising the following steps:

[0039] Potassium permanganate solution and ascorbic acid solution are mixed and reacted under the condition of stirring to obtain mesoporous manganese dioxide material, and the molar ratio of the potassium permanganate to the ascorbic acid is 10: (1-8).

[0040] The invention uses potassium permanganate and ascorbic acid as raw materials to prepare the mesoporous manganese dioxide material, the method is simple and fast, and is suitable for industrial production.

[0041] According to the present invention, the concentration of the potassium permanganate solution is preferably 0.1mol / L to 2mol / L, more preferably 0.3mol / L to 1mol / L; the concentration of the ascorbic acid solution is preferably 0.1mol / L to 2mol / L, more preferably 0.3 mol / L to 1 mol / L.

[0042]In the present invention, the ascorbic acid solution is preferably added dropwise...

Embodiment 1

[0061] Prepare 0.4mol / L potassium permanganate aqueous solution and 0.4mol / L ascorbic acid aqueous solution respectively, add 30mL ascorbic acid aqueous solution dropwise to 100mL potassium permanganate aqueous solution under the condition of rapid stirring, continue stirring for 30min after the dropwise addition, centrifuge After separation, a dark brown precipitate was obtained, which was alternately washed with water and ethanol for 5 times, and then dried in a vacuum oven at 60° C. for 12 hours to obtain a manganese dioxide material.

[0062] The XL-30ESEM type electron microscope of Philips that adopts the X-ray spectrum analyzer that has assembled energy dispersive is analyzed to described manganese dioxide material, and accelerating voltage is 15kV, and the result sees figure 1 with figure 2 , figure 1 A scanning electron microscope photo enlarged 10,000 times for the manganese dioxide material prepared in Example 1 of the present invention, figure 2 For the mangane...

Embodiment 2

[0069] Mix 6 mg of the manganese dioxide material prepared in Example 1 with 3 mg of the conductive adhesive purchased from Shanghai Hanbo Industrial Co., Ltd., model HB-012, and evenly coat it on the stainless steel battery current collector and press it into a film as a working electrode. Platinum The electrode is the counter electrode, the Ag / AgCl (saturated KCl) electrode is the reference electrode, and 20 mL of lithium sulfate solution with a concentration of 0.05mol / L, 0.1mol / L, 0.25mol / L, 0.5mol / L and 1mol / L , sodium sulfate solutions with concentrations of 0.05mol / L, 0.1mol / L, 0.25mol / L, 0.5mol / L and 1mol / L and concentrations of 0.05mol / L, 0.1mol / L, 0.25mol / L, 0.5mol / L and 0.65mol / L potassium sulfate solution as the electrolyte, using CH1700d electrochemical workstation in the voltage range of 0 ~ 1V, respectively at 1mVs -1 , 2mVs -1 , 5mVs -1 , 8mVs -1 , 10mVs -1 , 15mVs -1 , 20mVs -1 , 30mVs -1 , 50mVs -1 Downsweep cyclic voltammetry curve at the scan rate,...

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Abstract

The invention provides a mesoporous manganese dioxide material. Particle of the mesoporous manganese dioxide material is spherical-like, the surface of the particle is provided with mesopores and diamond-shaped bumps, the aperture of each mesopore is 5 to 30nm, and the specific surface area of the particle is 120 to 160 m<2> / g. The invention also provides a method for preparing the mesoporous manganese dioxide material. The method comprises the following steps of mixing a potassium permanganate solution and an ascorbic acid solution; and reacting to obtain the mesoporous manganese dioxide material under agitation, wherein the molar ratio of potassium permanganate to ascorbic acid is 10:(1-8). Besides, the invention provides a supercapacitor. The mesoporous manganese dioxide material has surface appearance similar to that of a walnut, the specific surface area, which is calculated by a brunauer-emmett-teller (BET) method, of the mesoporous manganese dioxide material is relatively large, and the supercapacitor has high electrochemical performance, particularly has relatively high unit specific surface area specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a mesoporous manganese dioxide material, a preparation method thereof and a supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of electrical storage device that have received widespread attention and research due to their advantages such as high power density, instantaneous charge and discharge, excellent reversibility, and long cycle life. National defense technology, aerospace and other fields have good application prospects. [0003] Electrode materials are the core of supercapacitors, which can affect the specific capacitance and other properties of supercapacitors. The prior art discloses a variety of electrode materials for supercapacitors, such as carbon materials, metal oxide materials, conductive polymers, etc. Among them, metal oxides have the advantages of good electronic conducti...

Claims

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Application Information

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IPC IPC(8): C01G45/02H01G9/042
CPCY02E60/13
Inventor 王宏宇李四横齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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