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Method for preparing manganese dioxide nanosheets by low-temperature hydrothermal method

A technology of manganese dioxide and hydrothermal method, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of unfavorable mass production of manganese dioxide, and achieve strong practicability, good conductivity and supercapacitive performance, and increase The effect of contact area

Inactive Publication Date: 2018-01-16
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction conditions of high temperature and high pressure are not conducive to the mass production of manganese dioxide

Method used

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  • Method for preparing manganese dioxide nanosheets by low-temperature hydrothermal method
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  • Method for preparing manganese dioxide nanosheets by low-temperature hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of manganese dioxide nanosheets

[0036] At room temperature, dissolve 32mg of potassium permanganate in 40ml of water to form a uniform potassium permanganate solution, then add 2.7mg of surfactant SDS and stir evenly; then slowly add 2ml of ethylene glycol dropwise and stir evenly; then heat up to 80°C , stirred and reacted for 120 minutes; the reaction product was washed and dried to obtain manganese dioxide nanosheets. For its structural characterization, see figure 1 , 2 , 3.

[0037] 2. Manganese dioxide nanosheet electrode preparation

[0038] Manganese dioxide nanosheets, acetylene black, and polytetrafluoroethylene were uniformly mixed at a mass ratio of 75%:15%:10%, respectively, and then coated on 1×1cm 2 On the nickel foam current collector, vacuum dry at 60°C for 12h. The content of manganese dioxide nanosheets on each working electrode is about 2 mg. After the mixture is evenly spread, the geometric surface area of ​​the working electro...

Embodiment 2

[0043] 1. Preparation of manganese dioxide nanosheets: no surfactant SDS was added, and the others were the same as in the examples.

[0044] 2. Manganese dioxide nanosheet electrode preparation: the same as in Example 1.

[0045] 3. Electrochemical properties of manganese dioxide: the test conditions and test methods are the same as in Example 1.

[0046] Test results: at a current density of 1A·g -1 , the specific capacitance reached 160F·g -1 , with a current density of 5A g -1 , the specific capacitance can still reach 91F·g -1 , The capacitance retention rate is 56.9%.

Embodiment 3

[0048] At room temperature, dissolve 32mg of potassium permanganate in 40ml of water to form a uniform potassium permanganate solution, then add 2.7mg of surfactant SDS; slowly add 2ml of ethylene glycol dropwise and stir well; then transfer to a 40°C water bath , stirred and reacted for 120 minutes; the reaction product was washed and dried to obtain manganese dioxide nanosheets.

[0049] 2. Manganese dioxide nanosheet electrode preparation: the same as in Example 1.

[0050] 3. Electrochemical properties of manganese dioxide: the test conditions and test methods are the same as in Example 1.

[0051] Test results: at a current density of 1A·g -1 , the specific capacitance reached 164F·g -1 , with a current density of 5A g -1 , the specific capacitance can still reach 125F·g -1 , The capacitance retention rate is 76.2%.

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Abstract

The invention discloses a method for preparing a manganese dioxide nanosheet in a low-temperature hydrothermal mode. The method comprises the steps that potassium permanganate is used as a raw material, ethanediol is used as a reducing agent, SDS is used as a surfactant, and the manganese dioxide nanosheet is integrated in one step in the low-temperature hydrothermal mode. The manganese dioxide nanosheet is loose in layer, large in gap, large in specific area and good in electrical conductivity and super capacitive performance. The raw materials are easy to obtain, the cost is low, practicability is strong, environmental friendliness is achieved, and the method has the good application prospect in the aspect of supercapacitor electrode materials.

Description

technical field [0001] The invention relates to a method for preparing manganese dioxide nanosheets, in particular to a method for preparing manganese dioxide nanosheets by a low-temperature hydrothermal method, which is mainly used as an electrode material for supercapacitors. Background technique [0002] With the rapid development of human civilization and the rapid growth of the world's population, the demand for traditional energy (coal, oil and natural gas) is increasing. Due to the non-renewable nature of traditional energy, it is excessively consumed so that it is about to be exhausted What is more serious is that the use of coal, oil and natural gas has caused serious environmental pollution problems. These environmental problems have brought a huge threat to human survival and social development, and human beings have to bear the various consequences of environmental pollution. Therefore, the development of renewable new energy and clean energy is an important cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2002/82C01P2004/03
Inventor 杨武黄萍郭昊包慧芳安惠惠林丹
Owner NORTHWEST NORMAL UNIVERSITY
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