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Preparation method of MnO<2>@GCs@MnO<2> composite material

A composite material, graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of cumbersome steps, unfavorable promotion and application, complicated operation, etc., to achieve simple operation, electrical conductivity and cycle stability Good properties and good dispersion

Inactive Publication Date: 2016-04-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

YeHou et al. (YeHouet.al, NanoLett. (2010) 10: 2727.l) prepared a hybrid structure of conductive polymer / carbon nanotube / spherical nano-manganese dioxide to improve the utilization rate and conductivity of manganese dioxide Although this method improves the cycle life and specific capacitance of manganese dioxide, the operation is complicated and the steps are cumbersome, which is not conducive to its promotion and application

Method used

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  • Preparation method of MnO&lt;2&gt;@GCs@MnO&lt;2&gt; composite material
  • Preparation method of MnO&lt;2&gt;@GCs@MnO&lt;2&gt; composite material
  • Preparation method of MnO&lt;2&gt;@GCs@MnO&lt;2&gt; composite material

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preparation example Construction

[0025] A kind of sandwich structure MnO 2 GCsMnO 2 The preparation method of composite material, comprises the following steps:

[0026] Step 1, preparing graphene capsules based on chemical vapor deposition equipment: a) spread and disperse nano-zinc oxide particles with a particle size of 10-200 nm in a quartz boat, and put the quartz boat into the middle of the quartz tube of a horizontal heating furnace, Pass inert gas into the quartz tube to discharge the air, then raise the temperature of the horizontal heating furnace to 400-800°C at a heating rate of 3-15°C / min; keep the temperature in the heating furnace at 400-800°C, Feed acetylene gas at a rate of ~50mL / min as a reactant for 30 to 60 min, and graphene nanolayers can be grown in situ on the surface of zinc oxide particles to obtain a graphene / zinc oxide composite material; The composite material of graphene / zinc oxide obtained in the previous step is soaked in 0.1~1mol / L nitric acid for 12~48h to remove zinc oxide ...

Embodiment 1

[0030] A kind of sandwich structure MnO 2 GCsMnO 2 The preparation method of composite material, comprises the following steps:

[0031]Step 1, preparation of graphene capsules: a) 100 mg particle size of 20nm nano-zinc oxide particles is evenly spread and dispersed in the quartz boat, and the quartz boat is placed in the middle of the quartz tube of the horizontal heating furnace, after checking the air tightness, Inject argon gas into the quartz tube at a rate of 80 mL / min for 20 minutes to discharge the air in the quartz tube; then raise the horizontal heating furnace from room temperature to 700 °C at a heating rate of 5 °C / min, and heat the After the temperature stabilizes for 20 minutes, stop feeding argon gas; keep the temperature in the heating furnace at 700°C, and feed acetylene gas into the heating furnace as a reactant at a rate of 50 mL / min for 30 min. After the reaction is completed, stop feeding Inject acetylene, then pass in argon, and cool down to room tempe...

Embodiment 2

[0036] A kind of sandwich structure MnO 2 GCsMnO 2 The preparation method of composite material, comprises the following steps:

[0037] Step 1, preparation of graphene capsules: a) 100 mg particle size of 20nm nano-zinc oxide particles is evenly spread and dispersed in the quartz boat, and the quartz boat is placed in the middle of the quartz tube of the horizontal heating furnace, after checking the air tightness, Inject argon gas into the quartz tube at a rate of 80 mL / min for 20 minutes to discharge the air in the quartz tube; then raise the horizontal heating furnace from room temperature to 700 °C at a heating rate of 5 °C / min, and heat the After the temperature stabilizes for 20 minutes, stop feeding argon gas; keep the temperature in the heating furnace at 700°C, and feed acetylene gas into the heating furnace as a reactant at a rate of 50 mL / min for 30 min. After the reaction is completed, stop feeding Inject acetylene, then pass in argon, and cool down to room temp...

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Abstract

The invention discloses a preparation method of an MnO<2>@GCs@MnO<2> composite material and belongs to the technical field of material preparation. The method comprises the steps as follows: a graphene capsule is firstly prepared; the prepared graphene capsule and potassium permanganate are added to water and are mixed evenly to obtain a mixed solution of the potassium permanganate and the graphene capsule; the mass ratio of the potassium permanganate to the graphene capsule material is 4 to (3-10); the concentration of the potassium permanganate is 0.05-0.15mol / L; finally, the mixed solution of the potassium permanganate and the graphene capsule is put into a microwave chemical reactor for reaction at 500-750W for 3-10 minutes; the reaction temperature is controlled at 90-100 DEG C; and after reaction is ended, the obtained turbid liquid is centrifugally separated and dried. The method disclosed by the invention is simple to operate, high in efficiency, high in manganese dioxide loading capacity and good in dispersity; and the prepared electrode material is good in conductivity and cycling stability and has relatively high specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to energy storage electrode materials, in particular to a sandwich structure MnO compounded with manganese dioxide and graphene capsules (Graphenecapsule, GCs) 2 GCsMnO 2 A method for preparing an electrode material for a supercapacitor. Background technique [0002] Supercapacitor is a new type of energy storage element, which has the advantages of high power density, short charging time, good high-current operating characteristics, and long life. It has broad application prospects in electronic products, new energy vehicles, and industrial energy-saving systems. Supercapacitor electrode materials can be divided into two categories according to the energy storage mechanism: one is the electric double layer material that uses the electric double layer mechanism to store energy, such as activated carbon fiber, activated carbon, carbon nanotubes, carbon gel, carbon black...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46H01G11/30
CPCY02E60/13H01G11/86H01G11/30H01G11/46
Inventor 简贤刘诗瑜唐辉尹良君高玉琪江志诚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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