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nio@mno for supercapacitor electrode materials 2 Nanosheet and its preparation method

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, nanotechnology, etc., can solve the problems of low electronic conductivity and low specific capacitance, and achieve improved specific surface area and high specific capacitance. Capacitance, device simplicity effect

Inactive Publication Date: 2017-12-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported NiO or MnO 2 The specific capacitance value is far lower than its theoretical specific capacitance value. For example, the patent with the notification number CN 103387268 B uses chemical methods to prepare flower-shaped nano-nickel oxide. The specific capacitance value is about 550F / g, after 3000 times of charging and discharging The specific capacity after circulation is around 460F / g; the publication number is the patent of CN 104409220 A, and the manganese dioxide (MnO 2 ) nanowire material, when the nanowire material is used as an electrode material for a supercapacitor, its specific capacitance only reaches 127 F / g
The main reason that the actual specific capacitance of the material is much lower than its theoretical specific capacitance is due to the fact that NiO or MnO 2 The electronic conductivity is relatively low

Method used

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  • nio@mno for supercapacitor electrode materials <sub>2</sub> Nanosheet and its preparation method
  • nio@mno for supercapacitor electrode materials <sub>2</sub> Nanosheet and its preparation method
  • nio@mno for supercapacitor electrode materials <sub>2</sub> Nanosheet and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Use an analytical balance to weigh the Ni(NO 3 ) 2 ·6H 2 O. Hexamethylenetetramine (HMT) was dissolved in deionized water, placed on a magnetic stirrer and stirred for 10 minutes to form a uniform solution, in which Ni(NO 3 ) 2 •6H 2 The concentration ratio of O and HMT is 1:2. Transfer the prepared homogeneous solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, put the prepared nickel foam substrate into the solution in the reaction kettle, and then put the reaction kettle into an oven at 100°C for reaction 2h, after the end of the reaction, take out the Ni(OH) 2 The substrate was cleaned and placed in a tube furnace for annealing treatment. The temperature of the annealing treatment was 350°C and the annealing time was 4h. After the annealing treatment, the Ni(OH) 2 into NiO.

[0031] Scanning electron microscope (SEM) morphology test was carried out on the prepared NiO, such as figure 1 As shown, it can be seen that the product NiO fo...

Embodiment 2

[0035] 1) Use an analytical balance to weigh the Ni(NO 3 ) 2 •6H 2 O. Hexamethylenetetramine (HMT) was dissolved in deionized water, placed on a magnetic stirrer and stirred for 10 minutes to form a uniform solution, in which Ni(NO 3 ) 2 •6H 2 The molar concentration ratio of O and HMT is 1:2. Transfer the prepared homogeneous solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, put the prepared nickel foam substrate into the solution in the reaction kettle, and then put the reaction kettle into an oven at 110°C for reaction 1h, after the end of the reaction, take out the Ni(OH) 2 The substrate was cleaned and placed in a tube furnace for annealing treatment. The temperature of the annealing treatment was 300°C and the annealing time was 5h. After the annealing treatment, the Ni(OH) 2 into NiO.

[0036] 2) Configure KMnO with a concentration of 0.03M 4 solution and transferred to a hydrothermal reactor, the NiO-grown substrate obtained in step 1) w...

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Abstract

The invention discloses NiO@MnO2 nano-sheets for a supercapacitor electrode material and a preparation method thereof. The NiO@MnO2 nano-sheets are of secondary sheet layer nano-structures formed by compositing NiO and MnO2, the NiO is of a sheet nano-structure, the nano-sheets are uniform in size and are mutually and evenly dispersed, even voids are formed among the sheets, and the MnO2 is densely and evenly distributed on the NiO nano-sheets in a sheet structure mode to form the secondary sheet layer nano-structures. A hydro-thermal synthesis method is adopted for preparing the NiO@MnO2 nano-sheets, and the NiO@MnO2 nano-sheets are obtained by means of the two-step hydro-thermal synthesis method. The NiO@MnO2 nano-sheets prepared by means of the preparation method have the advantages that the sheets are large in specific surface area, excellent specific capacitance, simple in preparation process and low in cost and can be produced in a batched mode.

Description

technical field [0001] The invention relates to the field of capacitor electrode materials, in particular to the field of composite oxide supercapacitor electrode materials. Background technique [0002] With the rapid development of human society, traditional energy and traditional energy use methods have become increasingly unable to meet human needs for energy use. At the same time, the resulting resource waste, resource depletion and environmental pollution have threatened the normal life of human beings. Therefore, new energy sources and new energy storage and use methods need to be developed to solve the existing crisis. In terms of energy storage and energy supply, traditional batteries and capacitors cannot meet the needs of use because they cannot provide high energy density and high power density at the same time, but supercapacitors have this advantage. Excellent characteristics such as wide range, short charging time, and environmental protection make supercapac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/24B82Y40/00
CPCY02E60/13
Inventor 吕建国袁禹亮
Owner ZHEJIANG UNIV