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A method for preparing nano-manganese dioxide with different shapes by hydrothermal synthesis

A technology of nano-manganese dioxide and hydrothermal synthesis, which is applied in the direction of manganese oxide/manganese hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., and can solve complex processes, products with only one-dimensional nanomaterials, It is not convenient for industrialization and other problems, and achieves the effects of simple process, controllable crystal shape and wide applicability

Active Publication Date: 2015-08-19
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

Method used

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  • A method for preparing nano-manganese dioxide with different shapes by hydrothermal synthesis
  • A method for preparing nano-manganese dioxide with different shapes by hydrothermal synthesis
  • A method for preparing nano-manganese dioxide with different shapes by hydrothermal synthesis

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Embodiment 1

[0022] Add potassium permanganate to deionized water, stir to form a uniform solution with a concentration of 0.3mol / L of potassium permanganate, then add manganese sulfate and stir to form a uniform mixed solution, the mass ratio of potassium permanganate and manganese sulfate 5:2, then transfer the above mixed solution to a high-temperature and high-pressure reactor with a polytetrafluoroethylene liner, react at a temperature of 140°C for 2 hours, then cool to room temperature, filter, and use deionized Rinse with water until neutral, and finally dry in air at 100°C to obtain nano manganese dioxide with different shapes. Discovery via SEM (eg figure 1 shown), the main morphology of manganese dioxide obtained under this condition is nanoflowers, only 2% to 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 there was an obvious peak at -0.433V (such as ...

Embodiment 2

[0024] The method is the same as in Example 1, except that the reaction is carried out at a temperature of 140° C. for 8 hours. Discovery via SEM (eg figure 2 shown), the main morphology of manganese dioxide obtained under this condition is still nanoflowers, but the nanorod 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 Figure 6 Shown), compared with the material obtained by the synthesis time of 2h, the peak position becomes positive and the catalytic activity is enhanced. When this nano-manganese dioxide is used as a microbial fuel cell cathode catalyst, such as Figure 5 As shown, the stable output voltage of the battery can reach: 0.42V.

Embodiment 3

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

[0026] The same method as in Example 1, except that the reaction was carried out at a temperature of 140° C. for 12 hours. It was found by SEM that no nanoflowers were found in the manganese dioxide obtained under this condition, and it was mainly nanorods, of which nanorods accounted for 60%~ 70%; the rest is nanotube morphology, and its specific surface area is about 160.2m 2 / g, and the electrochemical activity peak of the reaction further becomes positive at -0.308V (such as Figure 6 Shown), indicating that its catalytic activity is further enhanced compared with the material obtained with a synthesis time of 8h. When this nano-manganese dioxide is used as a microbial fuel cell cathode catalyst, 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 nano manganese dioxide with different shapes, in particular to a method for preparing nano manganese dioxide with different shapes by a hydrothermal synthesis method. Background technique: [0002] Manganese dioxide is an important industrial material because of its low cost, easy availability, non-toxicity, environmental friendliness, and safety. It is widely used in molecular ion sieves, catalysts, electrochemical capacitors, and energy storage and conversion systems. [0003] The basic structural unit of manganese dioxide is a hexagonal close-packed structure and a cubic close-packed structure composed of a manganese atom coordinated with 6 oxygen atoms. In the packing structure, the individual atomic layers form tetrahedral and octahedral cavities. Due to the basic unit [MnO 6 ] octahedron and adjacent octahedrons are connected in different ways, resulting in the appearance of different nano-mangan...

Claims

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Application Information

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Patent Type & Authority Patents(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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