A polyatomic co-doped porous carbon nanosheet electrode material and its preparation method and application

An electrode material and co-doping technology, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of low packing density, slow mass transfer process, and low heteroatom content of porous carbon electrode materials. Good rate performance and cycle stability, simple preparation method, high volume specific capacitance effect

Active Publication Date: 2019-08-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the common method of preparing biochar materials is to physically mix the biomass precursor with alkali and then activate it at high temperature to obtain a porous block structure with irregular morphology, and the content of heteroatoms is low, which makes the mass transfer process slow and the rate performance is low. Poor and low capacity; moreover, the resulting porous carbon electrode material tends to have a low packing density, resulting in a low volume specific capacitance

Method used

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  • A polyatomic co-doped porous carbon nanosheet electrode material and its preparation method and application
  • A polyatomic co-doped porous carbon nanosheet electrode material and its preparation method and application
  • A polyatomic co-doped porous carbon nanosheet electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 2 g of fish scales into a polytetrafluoroethylene hydrothermal tank liner filled with 0.6 M KOH aqueous solution, put the shell on, put it in an oven at 80 °C for 24 h, take it out, and absorb the yellow color after cooling to room temperature. Put the transparent solution into a freeze dryer for three days and take it out. Put the freeze-dried solid into a corundum porcelain boat and put it in a high-temperature tube furnace. Under an inert atmosphere, heat at 2.5 °C min -1 Heated at a heating rate of 600 °C and held for 1 h; after the tube furnace dropped to room temperature, the product in the corundum porcelain boat was taken out, washed with deionized water until neutral, and then dried in an oven at 80 °C to obtain multi- Atomically co-doped porous carbon nanosheet electrode materials (such as figure 1 ). Its specific surface area is 962 m 2 g -1 , the pore volume is 0.41 cm 3g -1 , the oxygen content is 14.64%, the nitrogen content is 5.05%, the sulfur ...

Embodiment 2

[0036] The operating conditions are the same as in Example 1, except that the carbonization temperature is 700 °C. The obtained polyatomic co-doped porous carbon nanosheet electrode material. Its specific surface area is 1637 m 2 g -1 , the pore volume is 0.72 cm 3 g -1 , the oxygen content is 13.05%, the nitrogen content is 3.41%, the sulfur content is 0.68%, and the sheet thickness is about 5 nm.

[0037] The same method as in Example 1 was used for electrochemical testing, and the results showed that the mass specific capacitances calculated by the constant current charge and discharge test were: 554, 337, 323, 296, 277, 266, 255, 248, 241, 235 、224 F g -1 , the volume specific capacitances are: 456, 277, 266, 244, 228, 219, 210, 204, 198, 193, 184 F cm -3 . at current densities from 1 Ag -1 increased to 200 A g -1 , the capacity retention rate is 75.7%. at 5 A g -1 The specific capacitance still maintains 93.7% after 10000 cycles under the current density.

Embodiment 3

[0039] The operating conditions are the same as in Example 1, except that the carbonization heating rate is 10 °C / min. The obtained polyatomic co-doped porous carbon nanosheet electrode material. Its specific surface area is 1224 m 2 g -1 , the pore volume is 0.52 cm 3 g -1 , the oxygen content is 13.45%, the nitrogen content is 4.14%, the sulfur content is 0.81%, and the sheet thickness is about 4 nm.

[0040] The same method as in Example 1 was used for electrochemical testing, and the results showed that the mass specific capacitances obtained through constant current charge and discharge tests were: 511, 367, 295, 289, 272, 263, 255, 241, 236, 230 、224F g -1 ;Volume specific capacities are: 501, 360, 283, 275, 267, 258, 250, 236, 231, 225, 220 F cm -3 , at current densities from 1 A g -1 increased to 200 A g -1 , the capacity retention rate is 77.4%. at 5 A g -1 The specific capacitance still maintains 94.2% after 10000 cycles under the current density.

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Abstract

The invention relates to multi-atom co-doped porous carbon nanosheet electrode material and a preparation method and an application thereof. Animal bone, skin and shell and other waste rich in protein act as precursors, the proteins of the precursors are extracted by using aqueous alkali and then the obtained mixed solution is dried and then carbonized under the temperature of 500-1200 DEG C, and finally the electrode material is obtained after washing. The material has the nanosheet structure and also has the nitrogen, oxygen and sulfur co-doped characteristics; and the material has high volume specific capacitance and mass specific capacitance and great multiplying power performance and cyclic stabilization performance when the material is used as the supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a polyatom co-doped porous carbon nanosheet electrode material, a preparation method thereof, and an application thereof in supercapacitors. Background technique [0002] With the depletion of fossil energy and the deteriorating environmental pollution, it is urgent to develop a new green and sustainable energy storage device. As one of the energy storage devices, supercapacitors have good conductivity, low cost, long cycle life, and high power density. However, its volumetric energy density and power density still need to be further improved. [0003] Carbon materials are widely used in supercapacitor electrode materials because they are abundant in resources, cheap and easy to obtain, and have excellent properties, such as good electrical conductivity, large specific surface area, and stable chemical properties. At present, the commercially used carbon electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/44H01G11/38H01G11/34H01G11/86
CPCY02E60/13
Inventor 王峰刘梦月牛津窦美玲宋夜
Owner BEIJING UNIV OF CHEM TECH
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