Manganese dioxide-porous carbon composite material as well as preparation method and application thereof

A manganese dioxide, composite material technology, applied in nanotechnology for materials and surface science, hybrid capacitor electrodes, nanotechnology, etc., can solve problems such as low conductivity, reduce structural damage, easy experimental conditions, and package. Even coverage

Inactive Publication Date: 2020-04-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application is limited due to its low electrical conductivity, and its disadvantages such as pulverization, peeling and shedding caused by stress during the redox cycle.

Method used

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  • Manganese dioxide-porous carbon composite material as well as preparation method and application thereof
  • Manganese dioxide-porous carbon composite material as well as preparation method and application thereof
  • Manganese dioxide-porous carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Take 0.03g of porous carbon, ultrasonically disperse in 30ml of water for 30 minutes, KMnO 4 and Na 2 SO 4 Add it to the porous carbon suspension at a concentration of 0.2 mol / L, stir vigorously for 16 hours, filter, wash the obtained product with distilled water, and dry it under vacuum at 150°C.

[0022] The morphology of the prepared product sample was observed by scanning electron microscope. figure 1 It can be seen that MnO 2 The 30nm spherical structure is attached to the porous carbon surface. This product was applied to supercapacitor electrode materials for electrochemical characterization. figure 2 It can be seen that at 0.5A·g -1 Under the current density, its capacity can be stabilized at 215F·g -1 .

example 2

[0024] Take 0.03g of porous carbon, ultrasonically disperse in 30ml of water for 30 minutes, KMnO 4 and Na 2 SO 4 Add it to the porous carbon suspension at a concentration of 0.3 mol / L, stir vigorously for 8 hours, filter, wash the obtained product with distilled water, and dry it under vacuum at 150°C.

[0025] Using a scanning electron microscope to observe the morphology of the prepared product samples, it can be seen that the MnO 2 It is a spherical structure attached to the surface of porous carbon. attached image 3 is its X-ray diffraction pattern, where 2θ is 12.7°, 18.1°, 28.7°, 37.5°, 41.8°, 49.8°, 60.1° and 69.5°, the corresponding diffraction peaks are consistent with the standard card JCPDS00-044-0141, corresponding to On the (110), (200), (310), (211), (301), (411), (521) and (541) crystal planes, the composite structure of porous carbon and manganese dioxide was confirmed. This product was applied to supercapacitor electrode materials for electrochemical ch...

example 3

[0027] Take 0.03g of porous carbon, ultrasonically disperse in 30ml of water for 30 minutes, KMnO 4 and Na 2 SO 4 Add it to the porous carbon suspension at a concentration of 0.1 mol / L, stir vigorously for 3 hours, filter, wash the obtained product with distilled water, and dry it under vacuum at 150°C.

[0028] The morphology of the prepared product sample was observed by scanning electron microscope. Figure 4 It can be seen that MnO 2 It is a spherical structure attached to the surface of porous carbon. This product was applied to supercapacitor electrode materials for electrochemical characterization. -1 Under the current density, its capacity can be stabilized at 181F g -1 .

[0029] It can be seen from the above three examples that KMnO 4 and Na 2 SO 4 The concentration is critical. When KMnO 4 and Na 2 SO 4 The concentration is too low, the reduced MnO 2 If the particle size is too small, the capacity of the assembled supercapacitor will be low. When KMnO...

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Abstract

The invention discloses a manganese dioxide-porous carbon composite material as well as a preparation method and application thereof. KMnO4 is reduced by utilizing porous carbon, and uniform MnO2 nanoparticles are obtained on the surface of the porous carbon, so that the conductivity of MnO2 is further improved, and the structural damage of MnO2 in an electrochemical cycle process is reduced. Under the current density of 0.5Ag<-1>, the capacity can be stabilized at 215F g<-1>. The method effectively improves the low conductivity of the traditional supercapacitor electrode material MnO2 and thepulverization shedding phenomenon caused by the stress generated in the oxidation-reduction cycle process. Therefore, the MnO2 / porous carbon composite material has a wide application prospect in theaspect of improving the conductivity and the stability of the supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and more specifically relates to a manganese dioxide (MnO 2 ) / porous carbon composite material and its preparation method and application. Background technique [0002] In the 21st century, global energy shortage is a serious problem. Some green energy sources, such as solar energy, wind energy, and hydroelectric power, are replacing fossil fuels. Electrochemical energy has become the focus of attention due to its high energy density and energy conversion efficiency, free assembly and movement, and no noise pollution. Supercapacitor is a new type of green energy storage device, which has higher power density than lithium-ion batteries, and has a wide range of applications, safety and easy maintenance, etc., so it has received extensive attention in the field of new energy. At present, MnO as an electrode material for supercapacitors 2 , due to its high theoretical capacity of 1232...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/32H01G11/46Y02E60/13
Inventor 许鑫华张茜贾丽敏石芸慧郑丽婷马绍帅
Owner TIANJIN UNIV
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