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Process for producing layered delta-MnO2 nano-particle

A nanoparticle and layered technology, applied in the field of preparation of MnO2, an electrode material for supercapacitors, can solve the problems of many chemical reagents, complex preparation methods, and long reaction time

Inactive Publication Date: 2009-04-08
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

α-MnO synthesized by S.Devaraj et al. using microemulsion method 2 , the specific capacity reaches 297F / g, and its disadvantage is that the chemical reagents used are more and the process is complicated [S.Devaraj, N.Munichandraiah, J.Electrochem.Soc.2007, 154, A80.]; Chinese patent 200410052665.3 water-soluble bivalent Manganese salts and inorganic bases are used as raw materials, cationic surfactants are used as templates, and water-soluble divalent cobalt salts or ferric salts are used as structural stabilizers to prepare layered manganese dioxide. The preparation process uses templates and surface active agent, the preparation method is more complicated, and the reaction time is long (>170h)

Method used

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  • Process for producing layered delta-MnO2 nano-particle
  • Process for producing layered delta-MnO2 nano-particle
  • Process for producing layered delta-MnO2 nano-particle

Examples

Experimental program
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Effect test

Embodiment 1

[0012] (1) Weigh potassium permanganate (KMnO 4 , ≥99.5), oleic acid (C 18 h 34 o 2 , relative density: 0.891~0.896g / mL at 20°C); potassium permanganate was completely dissolved in deionized water to form a solution, and then oleic acid was added to the solution and fully stirred to form a microemulsion; the above microemulsion was statically Put it in a microwave oven for 6 hours and heat it with 800 watts for 8 minutes. The obtained product was collected, washed by deionized water and absolute ethanol for 10 times, and then dried under air atmosphere to obtain layered δ-MnO 2 nanoparticles. figure 1 Shown is the resulting product δ-MnO 2 Scanning electron microscope pictures; figure 2 Shown is δ-MnO 2 TEM pictures of image 3 Shown is δ-MnO 2 The XRD patterns of the obtained MnO 2 layered δ-MnO 2 .

Embodiment 2

[0014] (1) Weigh potassium permanganate (KMnO 4 , ≥99.5), oleic acid (C 18 h 34 o 2 , relative density: 0.891~0.896g / mL at 20°C); potassium permanganate was completely dissolved in deionized water to form a solution, and then oleic acid was added to the solution and fully stirred to form a microemulsion; the above microemulsion was statically After 6 hours, put it into a microwave oven and heat it for 20 minutes with a power of 800 watts. The obtained product was collected, washed by deionized water and absolute ethanol for 10 times, and then dried under air atmosphere to obtain layered δ-MnO 2 nanoparticles.

Embodiment 3

[0016] (1) Weigh potassium permanganate (KMnO 4 , ≥99.5), oleic acid (C 18 h 34 o 2 , relative density: 0.891~0.896g / mL at 20°C); potassium permanganate was completely dissolved in deionized water to form a solution, and then oleic acid was added to the solution and fully stirred to form a microemulsion; the above microemulsion was statically Put it in a microwave oven for 3 hours and heat it with 800 watts for 10 minutes. The obtained product was collected, washed by deionized water and absolute ethanol for 10 times, and then dried under air atmosphere to obtain layered δ-MnO 2 nanoparticles.

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Abstract

The invention relates to a method for preparing a laminated delta-MnO2 nanometer particle. Potassium permanganate is dissolved in water, is added with oleic acid, is continuously stirred and is mixed to form a microemulsion. The microemulsion is kept stand for 3 to 8 hours, is put to a microwave oven and is heated for 5 to 20 minutes by the power of 800 watts; and a washing product is collected and dried to obtain the delta-MnO2 nanometer particle. The delta-MnO2 nanometer particle prepared by the method has short reaction time, high purity and even particle diameter; and the obtained product needs no extra heat treatment and has simple preparation process.

Description

technical field [0001] The invention relates to supercapacitor electrode material MnO 2 The preparation method of, especially relates to a layered δ-MnO 2 Preparation method of nanoparticles. Background technique [0002] Manganese dioxide is widely used in molecular sieves, biosensors, catalysis and energy storage due to its excellent physical and chemical properties. Because of its environmental friendliness, simple preparation process, and cheap and easy-to-obtain raw materials, it has been used as an electrode material for secondary lithium-ion batteries and supercapacitors in recent years. MnO 2 The theoretical capacity of electrode materials used in supercapacitors can reach 1370 F / g; but the actual specific capacity is far lower than this value, mainly because the utilization rate of materials is not high. Nanomaterials have a large specific surface area and have good electrochemical properties, so the preparation of nano-MnO with high specific surface area 2 Mat...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 余鹏张熊罗万居陈尧马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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