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Preparation method for preparing manganese dioxides in various crystal forms

A technology of manganese dioxide and crystal form is applied in the field of preparation of nano-manganese dioxide of different crystal forms, which can solve the problems that the product is only one-dimensional and the calcination temperature is high, and achieves the effect of simple experimental process and low cost.

Inactive Publication Date: 2013-02-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of only preparing a single crystal form, high calcination temperature and only one-dimensional single crystal nanowires as the product, and provides a method to prepare α-MnO with a one-dimensional structure 2 Nanofibers, β-MnO 2 δ-MnO with nanorods and two-dimensional structure (flower-like structure) 2

Method used

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  • Preparation method for preparing manganese dioxides in various crystal forms
  • Preparation method for preparing manganese dioxides in various crystal forms
  • Preparation method for preparing manganese dioxides in various crystal forms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Dissolve 608.4mg of manganese sulfate and 379.2mg of potassium permanganate in 5mL and 12mL of distilled water respectively, and stir to form a uniform solution;

[0021] (2) At room temperature, under the condition of stirring, add the potassium permanganate solution in step (1) into the manganese sulfate solution dropwise, and stir for 30 minutes;

[0022] (3) Transfer the reaction solution in step (2) to a reaction kettle, and react at 160°C for 6 hours. After the reaction, the product was collected by centrifugation and washed 5 times with distilled water and ethanol;

[0023] (4) Dry the product obtained in step (3) at 100°C for 8 hours to obtain α-MnO 2 Nanofibers.

[0024] The above obtained samples are made into electrodes: according to MnO 2 : Graphite: Acetylene black: PTFE The weight ratio is 70:12:12:6 Weigh 4 kinds of electrode materials and mix together, add 3mL of absolute ethanol, ultrasonically disperse for 10min. Pour all the uniformly mixed sl...

Embodiment 2

[0027] (1) Weigh 405.6mg of manganese sulfate and 126.4mg of potassium permanganate, dissolve them in 12mL and 4mL of distilled water, and stir to form a uniform solution;

[0028] (2) At room temperature, under the condition of stirring, add the potassium permanganate solution in step (1) dropwise into the manganese sulfate solution, and stir for 30 minutes.

[0029] (3) Transfer the reaction solution in step (2) to a reaction kettle, and react at 160°C for 6 hours. After the reaction, the product was collected by centrifugation and washed 6 times with distilled water and ethanol.

[0030] (4) Dry the product obtained in step (3) at 100°C for 8 hours to obtain β-MnO 2 Nano stave.

[0031] The above obtained sample is made into an electrode: by weight ratio MnO 2 : Graphite: Acetylene black: PTFE = 70:12:12:6 Weigh 4 kinds of electrode materials and mix them together, add 4mL of absolute ethanol, and ultrasonically disperse for 10min. Pour all the uniformly mixed slurry on...

Embodiment 3

[0034] (1) Dissolve 113mg of manganese sulfate and 632mg of potassium permanganate in 2mL and 15mL of distilled water respectively, and stir to form a uniform solution;

[0035] (2) At room temperature, under the condition of stirring, add the potassium permanganate solution in step (1) dropwise into the manganese sulfate solution, and stir for 30 minutes.

[0036] (3) Transfer the reaction solution in step (2) to a reaction kettle, and react at 160°C for 6 hours. After the reaction, the product was collected by centrifugation and washed 7 times with distilled water and ethanol;

[0037] (4) Dry the product obtained in step (3) at 100°C for 8 hours to obtain δ-MnO 2 Nanofibers.

[0038] The above obtained sample is made into an electrode: by weight ratio MnO 2 : Graphite: Acetylene black: PTFE=70:12:12:6 Weigh 4 kinds of electrode materials and mix together, add 5mL absolute ethanol, and disperse by ultrasonic for 10min. Pour all the uniformly mixed slurry on a stainless s...

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Abstract

The invention discloses a preparation method for preparing manganese dioxides in various crystal forms, comprising the following steps of: with divalent manganese salt as a reducing agent and potassium permanganate as an oxidant, adjusting the ratio of raw materials, and reacting in a reaction kettle at 160 DEG C for 1-12h to synthesize both one-dimensional alpha-MnO2 nano fibers and beta-MnO2 nano bars and gamma-MnO2 flower-like structures. The preparation method is simple in preparation process and low in cost; and the product can be used for the research in fields such as super capacitor direction, catalysis and the like.

Description

technical field [0001] The invention relates to a preparation method of manganese dioxide, in particular to a preparation method of nano manganese dioxide with different crystal forms. Background technique [0002] Manganese dioxide crystals are rich in resources and low in price. Based on [MnO6] octahedron, a variety of crystal structures are formed. The common ones are α, β, and γ types with chain or tunnel structures, layered δ types, and three-dimensional three-dimensional structures. The lambda type of the structure. Different crystal forms of MnO can be obtained by changing the preparation method, raw materials and preparation conditions 2 , MnO 2 These properties make it have broad application prospects in catalysis, electronics, ceramics, especially in supercapacitors. [0003] Common methods for preparing manganese dioxide include electrodeposition, microemulsion, hydrothermal, and redox methods. For example, Deva raj et al. reported in J Solid State Electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B82Y40/00H01G9/042
CPCY02E60/13
Inventor 侯峰杨春周富强
Owner TIANJIN UNIV
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