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MnO2 nanometer composite material and preparation method thereof

A nano-composite material and nano-material technology, applied in the field of MnO2 nano-composite materials and its preparation, can solve problems such as complex structures, achieve high energy density, stable electrochemical cycle performance, and promote the effect of increasing specific capacitance

Active Publication Date: 2014-05-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Manganese dioxide is a polymorphic oxide with a complex structure

Method used

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  • MnO2 nanometer composite material and preparation method thereof
  • MnO2 nanometer composite material and preparation method thereof
  • MnO2 nanometer composite material and preparation method thereof

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[0029] The embodiment of the present invention discloses a kind of MnO 2 The preparation method of nanocomposite material, comprises the following steps:

[0030] Disperse manganese-containing nanomaterials in potassium permanganate solution and perform hydrothermal reaction to obtain MnO 2 nanocomposites;

[0031] The manganese-containing nanomaterials are MnOOH nanowires, α-MnO 2 , β-MnO 2 or Mn 3 o 4 .

[0032] According to the invention, the manganese-containing nanometer material is dispersed in the potassium permanganate solution, and hydrothermal reaction occurs with the potassium permanganate solution according to the difference of the manganese-containing material. The manganese-containing material is a MnOOH nanowire, and the MnOOH nanowire reacts with potassium permanganate, and the MnOOH is converted into β-MnO 2 , Potassium permanganate self-decomposes to obtain parallel or staggered sheet-like δ-MnO 2 layer wrapped in the β-MnO 2 peripheral. The mangane...

Embodiment 1

[0040] Disperse 15 mg of MnOOH nanowire template in 40 mL of 0.01 mol / L, pH 3 potassium permanganate solution, and ultrasonically disperse for 10 minutes to obtain a mixed system.

[0041] The mixed system was moved to a polytetrafluoroethylene-lined hydrothermal reaction kettle, and a hydrothermal reaction was carried out at a temperature of 140° C. for 8 hours. The reacted product was washed with water and ethanol, and dried at 60°C to obtain MnO 2 nanocomposites.

[0042] figure 1 MnO prepared for Example 1 2 XRD patterns of nanocomposites. figure 1 In, O is δ-MnO 2 (JCPDS80-1098), ★ is β-MnO 2 (JCPDS81-2261), ◆ is MnOOH (JCPDS41-1379).

[0043] figure 2 MnO prepared for Example 1 2 SEM images of nanocomposites;

[0044] image 3 MnO prepared for Example 1 2 TEM image of the nanocomposite.

[0045] Depend on Figure 1 ~ Figure 3 It can be seen that the embodiment has prepared MnO 2 nanocomposites.

[0046] Figure 4 MnO prepared for Example 1 2 EBT curves ...

Embodiment 2

[0053] Disperse 20 mg of MnOOH nanowire template in 40 mL of 0.02 mol / L, pH 3 potassium permanganate solution, and ultrasonically disperse for 10 minutes to obtain a mixed system.

[0054] The mixed system was moved to a polytetrafluoroethylene-lined hydrothermal reaction kettle, and a hydrothermal reaction was carried out at a temperature of 140° C. for 8 hours. The reacted product was washed with water and ethanol, and dried at 60°C to obtain MnO 2 nanocomposites.

[0055] Figure 9 MnO prepared for Example 2 2 SEM image of the nanocomposite.

[0056] MnO of the present invention 2 The specific capacitance of the nanocomposite material is 280.6F / g, and after 1000 cycles, it can still maintain 91% of the original capacitance.

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Abstract

The invention provides a preparation method of a MnO2 nanometer composite material. The preparation method comprises the following steps: dispersing a manganese-containing nanometer material in a potassium permanganate solution, and carrying out hydrothermal reaction so as to obtain the MnO2 nanometer composite material, wherein the manganese-containing nanometer material is a MnOOH nanowire, alpha-MnO2, beta-MnO2 or Mn3O4; the manganese-containing nanometer material can react with potassium permanganate or the manganese-containing nanometer material self changes in crystal form, so that the beta-MnO2 is obtained; the periphery of the beta-MnO2 is wrapped by parallel or staggered flaky delta-MnO2 obtained by self decomposition of the potassium permanganate to form the composite material. The MnO2 nanometer composite material has a mesoporous layered structure, so that a sufficient specific surface area is ensured, and the oxidization-reduction reaction in a charge-discharge process is facilitated. Experimental results prove that the specific capacity of the MnO2 nanometer composite material is 250-306.6F / g, and after the MnO2 nanometer composite material circulates for 1000 times, the electric capacity of the MnO2 nanometer composite material still can be maintained at above 90% of original capacity.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to MnO 2 Nanocomposites and methods for their preparation. Background technique [0002] Manganese dioxide is a polymorphic oxide with a complex structure. The currently recognized microstructure of manganese dioxide is that one manganese atom and six oxygen atoms coordinate to form the basic structural unit [MnO6] octahedron of manganese dioxide, and the manganese atom is located in the middle of the octahedron. Due to the different linking modes of [MnO6] octahedra in manganese dioxide, the crystal structure exists α-MnO 2 , β-MnO 2 , δ-MnO 2 , ε-MnO 2 and many other variants. Manganese dioxide has become the transition metal oxide with the most application potential in supercapacitor materials due to its high energy density, high specific surface area, low price, and environmental friendliness. [0003] Nano-manganese dioxide has two charge storage methods: double-layer capaci...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 张育新朱士锦况敏郭小龙郭早阳
Owner CHONGQING UNIV
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