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Manganese dioxide/ferric oxide nanometer composite material as well as preparation method and application thereof

An iron oxide nanometer and composite material technology is applied in the field of inorganic nanocomposite material preparation, which can solve the problems of low conductivity of manganese dioxide, and achieve the effects of controllable morphology, good cycle stability and good dispersibility.

Inactive Publication Date: 2013-03-06
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a preparation method of a manganese dioxide / iron oxide nanocomposite material. Preparation method of manganese dioxide / iron oxide nanocomposite material with capacitive properties

Method used

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  • Manganese dioxide/ferric oxide nanometer composite material as well as preparation method and application thereof
  • Manganese dioxide/ferric oxide nanometer composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add potassium ferrocyanide to 0.002 mol / L potassium permanganate solution to obtain a transparent mixed solution with a molar ratio of iron:manganese of 3:1.

[0026] (2) The mixed solution prepared in step (1) was introduced into a hydrothermal reaction kettle, and a hydrothermal reaction was carried out at 120° C. for 24 hours to obtain a suspension.

[0027] (3) The suspension obtained in step (2) is filtered, the filter cake is washed with distilled water, and then dried at 60°C to obtain a manganese dioxide / iron oxide nanocomposite material.

[0028] (4) The composite material prepared in the preparation step (3) was mixed with conductive carbon and polytetrafluoroethylene at a mass ratio of 75:20:5 to form a composite material electrode. In the three-electrode system, the specific capacitance of the prepared composite electrode in 1 mol / L sodium sulfate solution reached 530 F / g, and the specific capacity remained at 92% after 2000 charge-discharge cycles.

Embodiment 2

[0029] (1) Add potassium ferrocyanide to 0.002 mol / L potassium permanganate solution to prepare a transparent mixed solution with a molar ratio of iron: manganese of 3:1.

[0030] (2) The mixed solution prepared in step (1) was introduced into a hydrothermal reaction kettle, and a hydrothermal reaction was carried out at 120° C. for 48 hours to obtain a suspension.

[0031] (3) The suspension obtained in step (2) is filtered, the filter cake is washed with distilled water, and then dried at 60°C to obtain a manganese dioxide / iron oxide nanocomposite material.

[0032] (4) Mix and press the composite material prepared in step (3) with conductive carbon and polyvinylidene fluoride at a mass ratio of 75:20:5 to prepare a composite material electrode. In the three-electrode system, the specific capacitance of the prepared composite electrode in 1 mol / L sodium sulfate solution reached 462 F / g, and the specific capacity remained at 87% after 2000 charge-discharge cycles.

Embodiment 3

[0033] (1) Add potassium ferrocyanide to 0.01 mol / L potassium permanganate solution to prepare a transparent mixed solution with a molar ratio of iron:manganese of 3:1.

[0034] (2) The mixed solution prepared in step (1) was introduced into a hydrothermal reaction kettle, and a hydrothermal reaction was carried out at 150° C. for 48 hours to obtain a suspension.

[0035] (3) The suspension obtained in step (2) is filtered, the filter cake is washed with distilled water, and then dried at 60°C to obtain a manganese dioxide / iron oxide nanocomposite material.

[0036] (4) Mix the composite material prepared in step (3) with conductive carbon and styrene-butadiene rubber at a mass ratio of 75:20:5 and press into tablets to prepare a composite material electrode. In the three-electrode system, the specific capacitance of the prepared composite electrode in 1 mol / L sodium sulfate solution reached 380 F / g, and the specific capacity remained at 86% after 2000 charge-discharge cycles....

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Abstract

The invention relates to a manganese dioxide / ferric oxide nanometer composite material as well as a preparation method and application thereof, and belongs to a preparation technology and application field of inorganic matter composite materials. The structure of the composite material is characterized by utilizing a manganese dioxide nanometer bar as main body and covering nanometer ferric oxide granules on the surface of the manganese dioxide nanometer bar, wherein the composite material is prepared by utilizing potassium ferrocyanide and potassium permanganate as raw materials, and performing hydro-thermal synthesis, solid-liquid separation and drying steps on the raw materials, and the prepared inorganic nanometer composite material has excellent supercapacitor property. The preparation method of manganese dioxide / ferric oxide nanometer composite material provided by the invention is simple in structure and low in cost, and no dispersing agent or template is added; furthermore, the obtained manganese dioxide / ferric oxide nanometer composite material has the advantages of strong controllability, excellent supercapacitor property, and the like, so that the manganese dioxide / ferric oxide nanometer composite material has brilliant industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanocomposite materials, and in particular relates to a manganese dioxide / iron oxide nanocomposite material, a preparation method thereof, and a composite material electrode prepared from the manganese dioxide / iron oxide nanocomposite material. Background technique [0002] At present, supercapacitor materials mainly include porous carbon materials, transition metal oxides, conductive polymers, and composite or hybrid materials. The electrochemical performance of transition metal oxides is good, not only the electric double layer capacitance generated by charge separation on the electrode / electrolyte, but also the faradaic capacitance generated by fast and highly reversible chemical adsorption / desorption and oxidation / reduction reactions. Manganese dioxide has abundant reserves, low price and environmental friendliness, and has attracted much attention in the research of supercapa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/38H01G11/86
Inventor 王忠德郝晓刚韩念琛张忠林马旭莉刘世斌
Owner TAIYUAN UNIV OF TECH
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