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Tubular mesoporous manganese dioxide supercapacitor and preparation method thereof

A technology of supercapacitors and manganese dioxide, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of unfavorable specific capacity and high cost of active materials, and achieve the effects of low cost, good capacitance characteristics, and good environmental protection

Inactive Publication Date: 2013-01-09
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mesoporous manganese dioxide prepared by these methods has good properties, these methods all use expensive soft or hard templates, and the morphology of manganese dioxide is mostly 0-dimensional spherical particles, which is not conducive to improving the active material ratio. capacity
And adjusting the process conditions of these methods in a large range can only prepare a single crystal form of manganese dioxide

Method used

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  • Tubular mesoporous manganese dioxide supercapacitor and preparation method thereof
  • Tubular mesoporous manganese dioxide supercapacitor and preparation method thereof
  • Tubular mesoporous manganese dioxide supercapacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Dissolve 2 grams of potassium permanganate in 30 milliliters of deionized water, and then immerse 1.15 grams of cotton in the solution. After the cotton is completely soaked, take it out and dry it in an oven at 60°C. Then the cotton adsorbed with potassium permanganate was calcined in air at 500°C for 3 hours. Finally, the mesoporous manganese dioxide powder is obtained by washing the calcined product with water. figure 1 It is the XRD pattern of the final product, it can be seen from the figure that the product is δ-MnO 2 (The card number is No.80-1098). From the scanning electron microscope photos of the product, it can be seen that the morphology of the manganese dioxide powder is tubular (diameter 5 μm, average aspect ratio 18, inner diameter ratio 0.95). figure 2 is the nitrogen adsorption-desorption curve of the product. From the curve, it can be seen that the product is a mesoporous porous substance with an average pore diameter of about 5nm ( figure 2 ins...

Embodiment 2

[0046] Dissolve 1 gram of potassium permanganate in 30 milliliters of deionized water, and then soak 0.5 grams of cotton in the above solution. After the cotton is completely soaked, take it out and dry it in an oven at 60°C. Then the cotton adsorbed with potassium permanganate was calcined in air at 800°C for 3 hours. Finally, the tubular mesoporous manganese dioxide powder (diameter 4.5 μm, average aspect ratio 20, inner diameter ratio 0.96) was obtained by washing the calcined product with water. XRD test shows that the obtained product is also α-MnO 2 (The diffraction pattern is shown in Figure 5 ) (card number 44-0141). The nitrogen adsorption-desorption curve of the product also shows that the product is a mesoporous substance (average pore size is about 8nm). Its specific surface area is 40.12m 2 / g.

[0047] The obtained tubular mesoporous manganese dioxide powder was prepared into an electrode, which was prepared in 0.5M Na 2 SO 4 Among them, the potential ra...

Embodiment 3

[0049] Dissolve 3 grams of potassium permanganate in 30 milliliters of deionized water, and then soak 2.2 grams of cotton in the above solution. After the cotton is completely soaked, take it out and dry it in an oven at 60°C. Then the cotton adsorbed with potassium permanganate was calcined in the air at 700°C for 3 hours. Finally, the tubular mesoporous manganese dioxide powder was obtained by washing the calcined product with water (with a diameter of 6 μm, an average aspect ratio of 22, and a ratio of inner and outer diameters of 0.94). XRD test shows that the obtained product is γ-MnO 2 . The nitrogen adsorption-desorption curve of the product also shows that the product is a mesoporous substance (average pore size is about 4.1nm). Its specific surface area is 38.51m 2 / g.

[0050] The obtained tubular mesoporous manganese dioxide powder was prepared into an electrode, which was prepared in 0.5M Na 2 SO 4 Among them, the potential range of -0.2-0.6 volts exhibits g...

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Abstract

The invention discloses a tubular mesoporous manganese dioxide supercapacitor and a preparation method thereof. The tubular mesoporous manganese dioxide supercapacitor is characterized in that the tubular mesoporous manganese dioxide is formed by alpha phase manganese dioxide, beta phase manganese dioxide or gamma phase manganese dioxide or mixing each two of the three crystal phases or mixing the three crystal phases, pore size distribution of each of the three crystal phases is in a range from 2nm to 50nm, tube diameter of each of the three crystal phases is in a range from 0.5micrometer to 10micrometers, the internal and external diameter ratio of the three crystal phases is larger than 0.9, and the length-diameter ratio of the three crystal phases is larger than 10. The preparation method of the tubular mesoporous manganese dioxide supercapacitor includes that cottons are soaked in a potassium permanganate aqueous solution, after drying, the cottons which absorb potassium permanganate are calcined in the air to obtain a product, and the calcined product is subjected to washing and drying to obtain a manganese oxide powder body. The tubular mesoporous manganese dioxide has good capacitance and high energy storage characteristics and can be used as an electrode material of the supercapacitor. The tubular mesoporous manganese dioxide supercapacitor and the preparation method thereof have the advantages of being simple, environment-friendly, low in cost, and good in performance and the like.

Description

technical field [0001] The invention relates to a capacitor of tubular mesoporous manganese dioxide and a preparation method thereof, in particular to tubular mesoporous manganese dioxide applicable to supercapacitor electrode materials. Background technique [0002] Supercapacitors, also known as supercapacitors, gold capacitors, gold capacitors, energy storage capacitors, farad capacitors, electrochemical capacitors or electric double layer capacitors (EDLC in English, Electric Double Layer Capacitors), are stored by polarized electrolyte Novel electrochemical devices for electrical energy. It is a new type of power energy storage element that has emerged with the breakthrough of material science in the past ten years, and its mass production is only a few years away. [0003] Since the appearance of supercapacitors on the market, the global demand has expanded rapidly, and it has become a new industrial highlight in the field of chemical power supplies. Supercapacitors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84
CPCY02E60/13
Inventor 徐华蕊颜东亮朱归胜杨会娟
Owner GUILIN UNIV OF ELECTRONIC TECH
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