Preparation of natural nutshell carbon material and application of natural nutshell carbon material in electrochemical capacitors

A nutshell carbon, natural technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reducing the conductivity of carbon materials, restricting the specific gravity of carbon materials, and achieve good stability and stability. , the effect of increasing the specific capacitance

Inactive Publication Date: 2014-09-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the activated carbon with high specific surface area is mostly mesoporous carbon, and the developed mesopores will inevitably sacrifice a certain micropore specific surface area; at the same time, the developed pore structure also restricts the stacking speci...

Method used

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  • Preparation of natural nutshell carbon material and application of natural nutshell carbon material in electrochemical capacitors
  • Preparation of natural nutshell carbon material and application of natural nutshell carbon material in electrochemical capacitors
  • Preparation of natural nutshell carbon material and application of natural nutshell carbon material in electrochemical capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1: making porous nano pistachio shell carbon material

[0067] Step 1, carbonization of natural fruit shell;

[0068] Pistachio shells with a moisture content of less than 5% are placed in a steel jade boat in a tube furnace, and carbonized in a protective atmosphere of high-purity argon gas with a volume percentage of 99.99%, to obtain carbonized pistachio shells;

[0069] Carbonization conditions: raise the temperature to 270°C at a heating rate of 3°C / min, and treat at a constant temperature for 2 hours; then raise the temperature to 750°C at a heating rate of 3°C / min, and treat at a constant temperature for 3 hours;

[0070] In the present invention, the tube furnace is a 1200-degree open-type vacuum atmosphere tube furnace with multi-temperature zones produced by Tianjin Zhonghuan Experimental Electric Furnace Co., Ltd., whose model is SX-G05123K-655.

[0071] see figure 1 As shown, a in the figure is a scanning electron microscope (SEM) photo of pista...

Embodiment 2

[0103] Embodiment 2: making porous nano-peanut shell shell carbon material

[0104] Step 1, carbonization of natural fruit shell;

[0105] placing peanut shells with a moisture content of less than 5% in a steel jade boat in a tube furnace, and carbonizing them in a protective atmosphere of high-purity argon with a volume percentage of 99.99%, to obtain carbonized peanut shells;

[0106] Carbonization conditions: raise the temperature to 220°C at a heating rate of 5°C / min, and treat at a constant temperature for 1 hour; then raise the temperature to 750°C at a heating rate of 3°C / min, and treat at a constant temperature for 3 hours;

[0107] In the present invention, the tube furnace is a 1200-degree open-type vacuum atmosphere tube furnace with multi-temperature zones produced by Tianjin Zhonghuan Experimental Electric Furnace Co., Ltd., whose model is SX-G05123K-655.

[0108] By observing the peanut shell shell under a scanning electron microscope (SEM), its surface morphol...

Embodiment 3

[0128] Embodiment 3: making porous nano walnut shell shell carbon material

[0129] Step 1, carbonization of natural fruit shell;

[0130] placing walnut shells with a water content of less than 5% in a steel jade boat in a tube furnace, and carbonizing them in a protective atmosphere of high-purity argon with a volume percentage of 99.99%, to obtain carbonized walnut shells;

[0131] Carbonization conditions: raise the temperature to 300°C at a heating rate of 10°C / min, and treat at a constant temperature for 3 hours; then raise the temperature to 800°C at a heating rate of 5°C / min, and treat at a constant temperature for 4.5 hours;

[0132] In the present invention, the tube furnace is a 1200-degree open-type vacuum atmosphere tube furnace with multi-temperature zones produced by Tianjin Zhonghuan Experimental Electric Furnace Co., Ltd., whose model is SX-G05123K-655.

[0133] By observing the walnut shell shell under a scanning electron microscope (SEM), its surface morpho...

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Abstract

The invention discloses a preparation of a natural nutshell carbon material and an application of the natural nutshell carbon material in electrochemical capacitors. The preparation of the natural nutshell carbon material refers to performing carbonization-alkali activation on a natural nutshell at high temperature to obtain a porous nano nutshell carbon material. In an alkali aqueous solution electrolyte, the specific capacitances of double electric layers respectively reach 312Fg<-1> and 224Fg<-1> under the potential scan rates of 2mV/s and 500mV/s. When organic electrolyte uses 1M tetraethylammonium tetrafluoroborate as an electrolyte, the capacitances respectively reach 209Fg<-1> and 50Fg<-1> under the potential scan rates of 10mVs(-1) and 500mVs(-1). Under a high scanning rate, the specific capacitance is relatively stable, which suggests that the natural nutshell carbon material has very broad application prospects as a high-power super capacitor active material. Moreover, as the material is natural biological material pistachio nut shell, the range of sources is wide, and the price is low. In addition, the electrode material preparation process is simple and controllable, the condition is mild, the equipment is simple, and the preparation process has practical production values.

Description

technical field [0001] The present invention relates to the preparation of a carbon material and its application in electrochemical capacitors, more particularly, it refers to a kind of carbon material using natural fruit shell as the precursor, after high temperature carbonization-alkali activation to obtain nanoporous The carbon material, which can be used to make electrodes of capacitors, belongs to the field of inorganic nanometer materials and electrochemistry. Background technique [0002] There are various kinds of husks in nature. Some have thick and hard walls, such as pistachios, walnut shells, almond shells, cherry shells, and jujube shells. There are also some shells with dense but thinner shells, such as sunflower seed shells, watermelon seed shells, peanut shells, pecan shells, etc. [0003] Supercapacitors are divided into double-layer capacitors and pseudocapacitors from the energy storage mechanism. It is a new type of energy storage device, which has the...

Claims

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Application Information

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IPC IPC(8): H01G11/44H01G11/24H01G11/86
CPCY02E60/13
Inventor 高秋明徐建东
Owner BEIHANG UNIV
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