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Porous manganese dioxide and preparation method thereof

A manganese dioxide, porous structure technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor capacitance, low specific surface area, small pore size, etc., to improve specific capacitance, preparation method Simple and effective to increase the specific surface area

Active Publication Date: 2014-10-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main problem of supercapacitors is that the energy density needs to be further improved, and the cost needs to be further reduced.
[0004] Manganese dioxide with porous channels, large specific surface area, and high conductivity is the most sought-after goal. However, most of the manganese dioxide reported in the literature has the disadvantages of small pore size, low specific surface area, and poor capacitance. And this problem is exactly the technical problem to be solved by the present invention

Method used

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  • Porous manganese dioxide and preparation method thereof
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  • Porous manganese dioxide and preparation method thereof

Examples

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Embodiment 1

[0023] A preparation method of porous manganese dioxide, specifically comprising the following steps:

[0024] (1) Slowly add 600 mL of ammonium carbonate solution with a concentration of 1 mol / L to 50 mL of an aqueous aluminum nitrate solution with a temperature of 80 °C and a concentration of 20 mol / L, stir until the solution is transparent, and then control the temperature to -20 °C for freeze-drying , and then transferred to a muffle furnace to control the temperature rise rate of 5°C / min and heat up to 200°C for 10 hours of thermal decomposition, and the obtained solid is aluminum oxide with a porous structure;

[0025] The amount of 20mol / L aluminum nitrate solution and 1mol / L ammonium carbonate used above is calculated on a molar ratio, that is, aluminum nitrate:ammonium carbonate is 1:0.6;

[0026] (2) Immerse 3g of aluminum oxide with a porous structure obtained in step (1) into 20mL of potassium permanganate aqueous solution with a concentration of 0.001mol / L for 0.5...

Embodiment 2

[0034] A preparation method of porous manganese dioxide, specifically comprising the following steps:

[0035] (1) Slowly add 700 mL of ammonium carbonate solution with a concentration of 0.5 mol / L to 50 ml of an aqueous solution of aluminum nitrate with a concentration of 10 mol / L at a temperature of 90 ° C, stir until the solution is transparent, and then control the temperature to -20 ° C for freezing Dry it, then transfer it to a muffle furnace to control the temperature rise rate at 5°C / min and heat up to 300°C for 8 hours to decompose, and the obtained solid is aluminum oxide with a porous structure;

[0036] The amount of 10mol / L aluminum nitrate aqueous solution and 0.5mol / L ammonium carbonate aqueous solution used above is calculated on a molar ratio, that is, aluminum nitrate:ammonium carbonate is 1:0.7;

[0037] (2) Immerse 3 g of aluminum oxide with a porous structure obtained in step (1) into 20 mL of potassium permanganate aqueous solution with a concentration of...

Embodiment 3

[0045] A preparation method of porous manganese dioxide, specifically comprising the following steps:

[0046] (1), with the step (1) of embodiment 1, obtain the aluminum oxide with porous structure;

[0047] (2) Immerse 3g of aluminum oxide with a porous structure obtained in step (1) into 20mL of potassium permanganate aqueous solution with a concentration of 0.005mol / L for 0.5h, allowing potassium permanganate to fully enter the three In the pores of alumina, then suction filtration;

[0048] The filter cake obtained by suction filtration is immersed in 40mL of manganese chloride aqueous solution with a concentration of 0.015mol / L, and the generation reaction of manganese dioxide is carried out under the control stirring speed of 2000-3000r / min for 1-3h, and then suction filtration again;

[0049] Add the filter cake obtained by suction filtration again to 30ml of sulfuric acid aqueous solution with a concentration of 30% by volume, and react at a temperature of 80°C for 7...

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Abstract

The invention discloses porous manganese dioxide and a preparation method thereof. The porous manganese dioxide is of a sponge-like three-dimensional porous structure and measured with a BET specific surface apparatus to obtain the pore size of 2-10nm and the specific surface area of 183.0-247.9 square meter / g. The preparation method includes firstly preparing aluminum oxide of a porous structure, immersing the aluminum oxide into an aqueous solution of potassium permanganate for 0.5-1 hour, filtering, immersing an obtained filtered cake into an aqueous solution of manganese chloride or manganese sulfate, stirring to produce manganese dioxide, filtering, immersing an obtained filtered cake into an aqueous solution of sulfuric acid for the reaction at 70-80 DEG C for 7-8 hour, filtering, cleaning, adding the obtained cake into an aqueous solution of sodium hydroxide for the reaction at 70-80 DEG C for 7-8 hours, filtering, cleaning, and drying the obtained cake at 110 DEG C in vacuum to obtain porous manganese dioxide. The porous manganese dioxide has a high specific capacitance and the preparation method is simple and low in costs.

Description

technical field [0001] The invention relates to a porous manganese dioxide and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage element that appeared at the end of the 20th century. Its energy storage properties are between traditional electrostatic capacitors and chemical power sources. It has high power density, short charging time, good high-current operating characteristics, and long life. The low-temperature performance is better than that of batteries, and it is called green energy. At present, the main problem of supercapacitors is that the energy density needs to be further improved, and the cost needs to be further reduced. [0003] Manganese dioxide is an energy material with abundant earth resources, low cost, and environmental friendliness. It has been widely used in primary batteries, lithium-ion batteries and other systems. Due to its high pseudocapacitance, it has great potential for application in su...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/24
Inventor 万传云沈海燕杨雅棋
Owner SHANGHAI INST OF TECH
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