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CuO-MnO2 core-shell structured nanometer material and preparation method for same

A nanomaterial, core-shell structure technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of single morphology, poor cycle stability, capacitance loss, etc., and achieve electrochemical cycle. Stable performance and high specific capacity

Active Publication Date: 2014-01-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With carbon nanotubes, carbon fibers or graphene as the shell, MnO 2 The core composite material has a relatively simple shape and relatively complex structure control. Most importantly, the cycle stability of this composite material is poor, and the capacitance loss is more than 15% after 1000 cycles.

Method used

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  • CuO-MnO2 core-shell structured nanometer material and preparation method for same
  • CuO-MnO2 core-shell structured nanometer material and preparation method for same
  • CuO-MnO2 core-shell structured nanometer material and preparation method for same

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preparation example Construction

[0040] The embodiment of the present invention discloses a CuO-MnO 2 A preparation method for a core-shell structure nanomaterial, comprising the following steps:

[0041] CuO-MnO was obtained by dispersing copper nanowires in potassium permanganate solution for hydrothermal reaction 2 Core-shell nanomaterials.

[0042] The present invention uses copper nanowires and potassium permanganate solution as raw materials to obtain CuO-MnO through redox 2 Core-shell nanomaterials.

[0043] Wherein, the diameter of the copper nanowire is preferably 100-200 nm. In the present invention, there is no special limitation on the source of the copper nanowires, which can be purchased from the market or prepared according to methods well known to those skilled in the art. The preparation method of described copper nanowire is preferably:

[0044]Shake copper nitrate, sodium hydroxide, ethylenediamine and hydrazine hydrate according to the volume ratio of 4:80:0.6:0.14 until the solution ...

Embodiment 1

[0053] Add 4 mL of 0.1 mol / L copper nitrate aqueous solution, 80 mL of 15 mol / L sodium hydroxide aqueous solution, 600 μL of 30% ethylenediamine solution by mass fraction and 140 μL of 30% hydrazine hydrate aqueous solution by mass fraction in the container, and shake for 5 minutes until the solution turns milky white. Then the container containing the above mixed solution was placed in a water bath at 65° C., and reacted for 1 h. The reacted mixed solution was placed in a centrifuge for solid-liquid separation, and the precipitate was collected, then deionized water was added to mix evenly, and then centrifuged again, and this was repeated 3 times. Finally, the collected precipitate was placed in a vacuum drying oven and dried at 60° C. for 24 hours to obtain copper nanowires with a diameter of 100-200 nm.

[0054] figure 1 It is the XRD spectrum of the copper nanowire prepared in Example 1.

[0055] figure 2 It is the SEM image of the copper nanowires prepared in Exampl...

Embodiment 2

[0058] Taking the newly prepared Cu nanowires in Example 1 as the substrate, using 0.05mol / L potassium permanganate solution, the volume ratio of the quality of the copper nanowires to the 0.05mol / L potassium permanganate solution is 10mg: 30mL The ratio of the two is mixed in a container, and magnetically stirred for 10 minutes to obtain a mixed system.

[0059] Move the mixed system to a hydrothermal reaction kettle lined with polytetrafluoroethylene, conduct a hydrothermal reaction at a temperature of 160°C for 24 hours, and then perform solid-liquid separation of the mixed liquid after the hydrothermal reaction , collect the precipitate after the reaction, add the obtained precipitate to deionized water and stir to mix evenly, place it in a centrifuge, and perform centrifuged solid-liquid separation again, repeat this 3 to 6 times, collect the final obtained precipitate, dry and obtain CuO -MnO 2 Core-shell nanomaterials.

[0060] image 3 CuO-MnO prepared for Example 2...

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Abstract

The invention provides a preparation method for a CuO-MnO2 core-shell structured nanometer material. The preparation method comprises the following steps of dispersing copper nanowires into a solution of potassium permanganate, and performing hydrothermal reaction to obtain the CuO-MnO2 core-shell structured nanometer material, wherein the copper nanowires and the solution of potassium permanganate are subjected to oxidation-reduction reaction to form the CuO-MnO2 core-shell structured nanometer material with a mesoporous layered architecture and a larger specific surface area, a copper-wrapping copper oxide serves as a core of the material, and a manganese dioxide serves as a shell of the material. When the material with the structure is used as an electrode, the transmission and the diffusion of electrolyte ions during electrochemical reaction are facilitated, and more active sites for the oxidation-reduction reaction during charging and discharging reaction are formed, so that higher specific capacity and stable electrochemical cycling performance are ensured. Experimental results show that the CuO-MnO2 core-shell structured nanometer material has specific capacity of 250 to 276F / g, and the electric capacity can still be kept over 90 percent of original capacity after 1,000 cycles.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to CuO-MnO 2 Core-shell structure nanomaterial and its preparation method. Background technique [0002] Among many hybrid materials, core-shell materials have special optical, electrical and chemical properties due to their different composition, size and structural arrangement, and have attracted the attention of scientists in recent years. The core-shell material is generally composed of a central core and an outer shell, and the core-shell part can be composed of a variety of materials, including polymers, inorganic substances, and metals. Today, core-shell structure materials have expanded into a multidisciplinary field of chemistry, physics, biology, and materials, and have shown promising application prospects in medicine, nonlinear optical devices, electroluminescent devices, and catalysis. [0003] Manganese dioxide has become the transition metal oxide with the most applicat...

Claims

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Application Information

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IPC IPC(8): H01G11/46B82Y30/00B82Y40/00
Inventor 黄明李飞郭早阳朱仕锦
Owner CHONGQING UNIV
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