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Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material

A manganese dioxide and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of high resistance and low specific capacity of carbon materials, achieve high specific capacity, and improve electric double layer capacitance , the effect of simple process

Active Publication Date: 2014-02-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the two types of electrode materials, metal oxides and conductive polymers, the specific capacity of carbon materials is low.
Manganese dioxide has the advantages of low cost, non-toxicity, high theoretical specific capacity, and good stability. It is an ideal electrode material, but its resistance is large.

Method used

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  • Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material
  • Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material
  • Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.6761g manganese sulfate monohydrate and 0.9128g ammonium persulfate into 45mL deionized water successively, stir for 60min, pour into the reaction kettle and put the reaction kettle into the oven, keep it in the oven at 100°C for 10h, and remove the black precipitate obtained from the reaction Wash and dry with deionized water and absolute ethanol to obtain sea urchin-like manganese dioxide with a hollow structure.

[0028] Dissolve 0.0625g of 0.2M hydrochloric acid solution and 0.1000g of F127 in 4g of absolute ethanol, and after stirring evenly, add 0.1300g of tetraethyl orthosilicate and 0.3125g of phenolic resin ethanol solution with a mass fraction of 20%, and continue stirring for 20min to obtain mixture.

[0029] Add 0.1000 g of the above-prepared sea urchin-like manganese dioxide into the above-mentioned mixed solution, ultrasonically stir it for 3 hours, let it stand at room temperature to volatilize and self-assemble for 5 hours, put it in an oven at 100...

Embodiment 2

[0031] Add 0.6761g manganese sulfate monohydrate and 0.9128g ammonium persulfate into 45mL deionized water successively, stir for 60min, pour into the reaction kettle and put the reaction kettle into the oven, keep it in the oven at 100°C for 10h, and remove the black precipitate obtained from the reaction Wash and dry with deionized water and absolute ethanol to obtain sea urchin-like manganese dioxide with a hollow structure.

[0032] Dissolve 0.25g of 0.2M hydrochloric acid solution and 0.4000g of F127 in 6g of absolute ethanol, and after stirring evenly, add 0.5200g of tetraethyl orthosilicate and 1.25g of phenolic resin ethanol solution with a mass fraction of 20%, and continue stirring for 20min to obtain mixture.

[0033] Add 0.1000 g of the above-prepared sea urchin-like manganese dioxide into the above-mentioned mixed solution, ultrasonically stir it for 3 hours, let it stand at room temperature to volatilize and self-assemble for 5 hours, put it in an oven at 100° C....

Embodiment 3 2

[0034] Example 3 Characterization of manganese dioxide / mesoporous carbon nanoscale composites

[0035] Field emission electron microscopy (HITACHI S4800) and nitrogen adsorption-desorption (Micromeritics ASAP2020) analyzers were used to analyze the surface morphology and chemical structure of the manganese dioxide / mesoporous carbon nanocomposites prepared in the above-mentioned examples 1 and 2. Characterization analysis, results such as figure 1 , 2 , 3 and Table 1.

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Abstract

The invention discloses a method for preparing a manganese dioxide / mesoporous carbon nanometer graded composite electrode material. The method includes the steps of taking manganese sulfate and ammonium persulfate as reactants, preparing sea-urchin-shaped manganese dioxide with a certain hollow structure through a hydrothermal method, then, taking phenolic resin and ethyl orthosilicate as a precursor of carbon and a precursor of silicon dioxide respectively, taking F127 as a constitution controller, combining ordered mesoporous carbon with the manganese dioxide together through volatilization self-assembly and carbonization, and finally removing silicon dioxide nanometer balls from the material through a sodium hydroxide aqueous solution to obtain the manganese dioxide / mesoporous carbon nanometer composite material with the graded structure. When the material is used as a supercapacitor electrode material, the specific capacity of the material is about one time larger than the specific capacity of the pure manganese dioxide, the test result shows that the composite material integrates the high conductivity of carbon materials and the high specific capacity of the manganese dioxide, the rate performance and the circulation stability of the material are improved, and excellent electrochemical performance is embodied.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a preparation method of a supercapacitor electrode material, in particular to a preparation of a manganese dioxide / mesoporous carbon nanometer graded composite material. technical background [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of green energy storage element that has attracted widespread attention because of their higher power density than batteries and higher energy density than traditional electric double layer capacitors. Especially in recent years, with the continuous growth of global energy demand and the decrease of fossil fuel reserves, and the environmental pollution caused by the burning of fossil fuels seriously affects the living environment of human beings, so the research and development of clean and renewable energy is becoming more and more important. extremely important. Supercapacitors also have the characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/38H01G11/46
Inventor 程起林姜立学李春忠赵洁杜双双
Owner EAST CHINA UNIV OF SCI & TECH
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