Method for preparing nano manganese dioxides with different appearances by hydrothermal synthesis process

A technology of nano-manganese dioxide and hydrothermal synthesis, applied in the direction of manganese oxide/manganese hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of inconvenient industrialization, complicated process, and only one product Dimensional nanomaterials and other issues, to achieve the effect of wide applicability, simple process, and controllable crystal shape

Active Publication Date: 2014-02-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above patents, the patent No. 201210405373.8 is a method for preparing manganese dioxide in different crystal forms by adjusting the ratio of raw materials. The preparation method of manganese one-dimensional nanomaterials has the disadvantage that the product is only one-dimensional nanomaterials

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  • Method for preparing nano manganese dioxides with different appearances by hydrothermal synthesis process
  • Method for preparing nano manganese dioxides with different appearances by hydrothermal synthesis process
  • Method for preparing nano manganese dioxides with different appearances by hydrothermal synthesis process

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Embodiment 1

[0022] Add potassium permanganate to deionized water, stir to form a uniform solution of potassium permanganate with a concentration of 0.3 mol / L, then add manganese sulfate and stir to form a uniform mixed solution. The mass ratio of potassium permanganate to manganese sulfate It is 5:2, then transfer the above mixed solution to a high temperature and high pressure reactor with a polytetrafluoroethylene liner, react at 140℃ for 2 hours, then cool to room temperature, filter, and deionize Rinse with water to neutrality, and finally dry in the air at 100°C to obtain nano-manganese dioxide with different morphologies. Found by SEM (such as figure 1 As shown), the main morphology of the manganese dioxide obtained under this condition is nanoflowers, only 2%-8% of nanorods exist, and its specific surface area is about 65.7m 2 / g, and its electrochemical catalytic activity was detected by cyclic voltammetry, and it was found that an obvious peak appeared at -0.433V (such as Image 6 ...

Embodiment 2

[0024] The method is the same as that in Example 1, except that the reaction was carried out at 140°C for 8 hours. Found by SEM (such as figure 2 As shown), the main morphology of the manganese dioxide obtained under this condition is still nanoflowers, but the nanorod-like structure increases, accounting for 20% to 30%, and its specific surface area is about 111.9m 2 / g, and the peak of its electrochemical activity appears at -0.385V (such as Image 6 As shown), compared with the material obtained with a synthesis time of 2h, the peak position becomes positive and the catalytic activity is enhanced. When this nano-manganese dioxide is used as a cathode catalyst for microbial fuel cells, such as Figure 5 As shown, the stable output voltage of the battery can reach 0.42V.

Embodiment 3

[0025] Example 3 A method for preparing nano-manganese dioxide with different morphologies by hydrothermal synthesis

[0026] The method is the same as in Example 1, except that it was reacted for 12 hours at a temperature of 140°C. It was found by SEM that the manganese dioxide obtained under this condition showed no nano-flowers, mainly nano-rods, of which nano-rods accounted for 60%~ 70%; the rest is nanotube morphology, and its specific surface area is about 160.2m 2 / g, and the peak value of its electrochemical activity becomes more positive and appears at -0.308V (such as Image 6 Shown), indicating that its catalytic activity is further enhanced compared with the material obtained with a synthesis time of 8 hours. When this nano-manganese dioxide is used as a cathode catalyst for microbial fuel cells, such as Figure 5 As shown, the stable output voltage of the battery can reach 0.48V.

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Abstract

The invention discloses a method for preparing nano manganese dioxides with different appearances by adjusting the reaction time only under exactly same other conditions. The method comprises the following steps of adding potassium permanganate into deionized water, and stirring to form a uniform solution in which the concentration of potassium permanganate is 0.3mol/L; then adding manganese sulfate, wherein the mass ratio of potassium permanganate to manganese sulfate is 5:2; then transferring the solution into a high-temperature high-pressure reaction kettle of which the inner container is a polytetrafluoroethylene inner container; reacting for 1-18 hours at 140 DEG C; cooling, filtering, flushing and finally drying to obtain a target product. In the method disclosed by the invention, the process is simple, the cost is relatively low, the reaction conditions are mild, and the appearance of the crystal form is controllable; the obtained product has stable quality, relatively high catalytic electrochemical activity, wide applicability and the like, and can be widely applied to lithium ion batteries, molecular sieves, catalysts, super capacitors and the like as well as the basic study of related fields.

Description

Technical field: [0001] The invention relates to a method for preparing nanometer manganese dioxide with different morphologies, in particular to a method for preparing nanometer manganese dioxide with different morphologies by adopting a hydrothermal synthesis method. Background technique: [0002] Manganese dioxide is an important industrial material with low-cost, easy-to-obtain, non-toxic, environmentally friendly, and safe properties, so it is widely used in molecular ion sieves, catalysts, electrochemical capacitors, energy storage and conversion systems and other fields. [0003] The basic structural unit of manganese dioxide is a hexagonal close-packed structure and a cubic close-packed structure composed of one manganese atom coordinated with six oxygen atoms. In the stacked structure, each atomic layer forms tetrahedral and octahedral holes. As the basic unit [MnO 6 ] The octahedron and the adjacent octahedron are connected in different ways, resulting in the appearance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 袁浩然邓丽芳陈勇郭华芳黄宏宇小林敬幸
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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