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a mno 2 @mn 3 o 4 Core-shell octahedral particle/graphene network composite electrode material

A network graphene and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., achieves the effect of simple experimental equipment and preparation process, simple operation, and good industrial application prospects

Active Publication Date: 2021-11-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite electrode materials composed of core-shell structure, oxide composite particles with special polyhedral morphology and three-dimensional network graphene have not been reported yet.

Method used

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  • a mno <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Core-shell octahedral particle/graphene network composite electrode material
  • a mno <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Core-shell octahedral particle/graphene network composite electrode material
  • a mno <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Core-shell octahedral particle/graphene network composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] mn 3 o 4 Preparation of octahedral nanoparticles:

[0034] Weigh 0.57g of manganese acetate tetrahydrate and 0.3g of polyvinylpyrrolidone and dissolve them in 35mL of water. After magnetically stirring for 30 min, the mixed solution was transferred to a 50 mL polytetrafluoroethylene reactor, and reacted at a constant temperature of 150° C. for 3 hours. After being naturally cooled to room temperature, it was centrifuged at 8000 rpm, washed three times with deionized water and ethanol, and finally dried in an oven at 60 degrees Celsius to obtain Mn 3 o 4 octahedral particles.

[0035] figure 1 a is the SEM figure of the product obtained in Example 1. It can be seen from the figure that the product presents a regular octahedral morphology with a relatively narrow size distribution. figure 1 b is a high-magnification TEM image, the edges and corners of the octahedron are clear, and each face is very smooth. From the HRTEM plot ( figure 1 c) It can be seen that the...

Embodiment 2

[0037] Core-shell MnO 2 @Mn 3 o 4 Preparation of nanoparticles:

[0038] Weigh 0.04g of the above Mn 3 o 4 The particles and 0.0316 g of potassium permanganate were dissolved in 30 mL of deionized water, then transferred to a 50 mL autoclave, and reacted at 160 °C for 10 hours. After centrifugation, repeated washing, and drying in an oven at 60 degrees Celsius, MnO with a core-shell structure is obtained. 2 @Mn 3 o 4 Nanoparticles.

[0039] figure 2 a is the SEM figure of the product prepared in Example 2. from figure 2 It can be seen in a that the product still retains the octahedral appearance, but the surface is very rough and the size becomes larger. The surface of each octahedral particle is uniformly covered with nanosheets. figure 2 b is a high-magnification TEM image. It can be seen that the thickness of the nanosheets is about 50 nm, and the nanosheets cross each other. From the HRTEM map ( figure 2 c) It is concluded that the surface-covered nanosheet...

Embodiment 3

[0041] MnO 2 @Mn 3 o 4 / NG composite electrode material preparation:

[0042] Weigh 0.01g of graphite oxide and disperse it in 34mL of deionized water. After ultrasonication at 540W for 80min, add 0.01g of the above core-shell structure MnO 2 @Mn 3 o 4 Particles were stirred by magnetic force for 1 hour; then 1 mL of ethylenediamine was added, and stirring was continued for 15 minutes. The mixed solution was transferred to a 50mL reactor, and reacted at a constant temperature of 150 degrees Celsius for 3 hours to obtain a columnar product. After soaking in deionized water for 12 hours, freeze-dried to obtain the final product MnO 2 @Mn 3 o 4 / NG.

[0043] image 3 Final product MnO prepared for embodiment 3 2 @Mn 3 o 4 / NG high-resolution XPS spectrum. The high-resolution XPS spectrum of K2p (Fig. 3a) shows that K+ exists in MnO 2 in phase. In the high resolution XPS spectrum of Mn2p ( image 3 In b), the two characteristic peaks are located at 645.2eV and 656....

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Abstract

The present invention proposes a core-shell octahedral particle / network graphene composite electrode material (MnO) with a special structure. 2 @Mn 3 o 4 / NG) and its preparation method. First prepare Mn 3 o 4 Octahedral nanoparticles, and then surface controllable coating of MnO with core-shell structure 2 @Mn 3 o 4 Nanoparticles, finally synthesized MnO 2 @Mn 3 o 4 / NG composite electrode material. ultrathin MnO 2 Nanosheets cross each other in Mn 3 o 4 On the octahedral surface, a hole-like ultra-thin shell is formed, and K + with water molecules in MnO 2 The intercalation of the nanosheet layered microstructure improves the structural stability of the material; the three-dimensional network graphene improves the charge / electron transport rate; the stability of the composite structure endows it with high cycle performance. The specific capacitance value of the prepared composite electrode material reaches 739F / g (current density 1A / g), and the capacitance retention rate is as high as 93.4% after 10000 charge-discharge cycles. The preparation method has the advantages of simple process, good repeatability, low cost, and easy control and scale.

Description

technical field [0001] The invention relates to a supercapacitor electrode material and its preparation method, especially a kind of MnO with special structure 2 @Mn 3 o 4 Core-shell octahedral particle / network graphene composite electrode material (MnO 2 @Mn 3 o 4 / NG), the material has excellent electrochemical performance. Background technique [0002] As a new energy storage method, supercapacitors have the characteristics of high power density, long cycle life, fast charging speed, and no pollution. Divided by electrode materials, supercapacitors include electric double layers dominated by carbon materials and transition metal oxides (MnO 2 、Co 3 o 4、 Fe 2 o 3 etc.) based pseudocapacitive capacitors. The latter not only forms an electric double layer at the interface between the electrolyte and the electrode, but also undergoes redox reactions on the surface of the electrode material. For example, low-cost MnO x Materials have significant advantages in elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 唐少春崔铭锦孟祥康
Owner NANJING UNIV
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