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Honeycomb graded-structure nanometer manganese dioxide and preparation method thereof

A technology of nano-manganese dioxide and hierarchical structure, which is applied in the field of materials science, can solve problems such as complex preparation methods, cumbersome operation steps, and single structure of manganese dioxide, and achieve good electrochemical performance and improved specific capacitance.

Inactive Publication Date: 2015-12-09
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a preparation method and application of nano-manganese dioxide with honeycomb hierarchical structure, and the preparation method and application of said nano-manganese dioxide with honeycomb hierarchical structure solve the problem of The preparation method of nano-manganese dioxide in the prior art is complex, the operation steps are cumbersome during synthesis, and the structure of the obtained manganese dioxide is relatively simple.

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  • Honeycomb graded-structure nanometer manganese dioxide and preparation method thereof
  • Honeycomb graded-structure nanometer manganese dioxide and preparation method thereof
  • Honeycomb graded-structure nanometer manganese dioxide and preparation method thereof

Examples

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Embodiment 1

[0025] (1) Solution preparation: Mix potassium permanganate and urea at a ratio of 1:1, the amount of each substance is 6mmol and add 48mL deionized water to prepare a concentration of 0.125mol / L. Magnetic stirring for 1h;

[0026] (2) Hydrothermal synthesis: transfer the solution in (1) into a 60mL pressure-resistant reactor, heat at 120°C for 12 hours to obtain a brown-black suspension, and filter the brown-black suspension to obtain a filter residue. Alternately wash 3 times with deionized water and ethanol, and then dry the product at 80°C for 3h;

[0027] (3) Roasting: Put the dried sample in (2) into a muffle furnace and bake at 320°C for 5 hours, and obtain the final solid manganese dioxide powder after cooling.

[0028] According to the mass ratio of active material manganese dioxide: acetylene black: PTFE = 80:15:5, it is coated on foamed nickel as a working electrode, and its specific capacitance can be tested on Chenhua CHI-660E electrochemical workstation. Reache...

Embodiment 2

[0030] (1) Solution preparation: Mix potassium permanganate and urea at a ratio of 1:1, the amount of each substance is 8mmol and add 48mL deionized water to prepare a concentration of 0.167mol / L. Magnetic stirring for 1h;

[0031] (2) Hydrothermal synthesis: transfer the solution in (1) into a 60mL pressure-resistant reactor, heat at 140°C for 11 hours to obtain a brown-black suspension, and filter the brown-black suspension to obtain a filter residue. Alternately wash 3 times with deionized water and ethanol, and then dry the product at 80°C for 3h;

[0032] (3) Roasting: Put the dried sample in (2) into a muffle furnace and bake at 350°C for 5 hours, and obtain the final solid manganese dioxide powder after cooling.

[0033] The finally obtained manganese dioxide powder is used as the supercapacitor electrode material, mixed according to the ratio of active material: acetylene black: PTFE = 80: 15: 5, and coated on the nickel foam as the working electrode. The electrochem...

Embodiment 3

[0035] (1) Solution preparation: Mix potassium permanganate and urea at a ratio of 1:1, the amount of each substance is 10mmol, and add 48mL deionized water to prepare a concentration of 0.208mol / L. Magnetic stirring for 1h;

[0036] (2) Hydrothermal synthesis: transfer the solution in (1) into a 60mL pressure-resistant reactor, heat at 120°C for 12 hours to obtain a brown-black suspension, and filter the brown-black suspension to obtain a filter residue. Alternately wash 3 times with deionized water and ethanol, and then dry the product at 80°C for 3h;

[0037] (3) Roasting: Put the dried sample in (2) into a muffle furnace and bake at 400°C for 2 hours, and obtain the final solid manganese dioxide powder after cooling.

[0038] The finally obtained manganese dioxide powder is used as the supercapacitor electrode material, mixed according to the ratio of active material: acetylene black: PTFE = 80: 15: 5, and coated on the nickel foam as the working electrode. The electroch...

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Abstract

The invention discloses a honeycomb graded-structure nanometer manganese dioxide and a preparation method thereof. The preparation method comprises: preparing a precursor solution with the manganese-source concentration of 0.125-0.250mol / L according to the KMnO4 to CO(NH2)2 molar ratio of 1:0.9-1.2; taking KMnO4as an oxidant and CO(NH2)2 as a reducing agent, performing hydrothermal reaction at 120-160 DEG C for 11-12 h, so as to generate a precursor; and putting the obtained hydrothermal product into a muffle furnace and calcining at 300-400 DEG C for 3-6 h, so as to obtain the final honeycomb graded-structure nanometer MnO2. The capacitance property of the obtained honeycomb graded-structure nanometer MnO2 is tested, and the specific capacitance reaches up to 140.4 F / g under the current density of 0.5 A / g, under the current density of 2 A / g, the specific capacitance is 99.5% of the original specific capacitance after the obtained nanometer MnO2 is circulated for 1000 times, and the nanometer MnO2 is a good electrode material for a supercapacitor.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a supercapacitor electrode material, in particular to a preparation method and application of nano manganese dioxide with honeycomb hierarchical structure. Background technique [0002] Due to the extensive use of fossil fuels such as coal and petroleum, environmental problems such as the greenhouse effect and the lack of resources have been caused. In order to solve this problem, people urgently need to find new green energy that can replace traditional energy. The supercapacitor has a high discharge power and charge storage capacity, which fills the gap between the two types of energy storage components, traditional capacitors and batteries, and meets human needs for new green energy. [0003] Manganese dioxide widely exists in nature, because of its low price, good environment, multiple oxidation forms, wide potential window and other advantages, it has attracted more and more ...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 房永征祁鹏金建群黄成杰章开张娜
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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