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Preparation method of three-dimensional boron-nitrogen co-doped layered carbon for water system high-voltage supercapacitor

A supercapacitor, high-voltage technology, used in carbon preparation/purification, hybrid capacitor electrodes, etc., can solve the problems of difficult to improve SC energy density, low decomposition voltage, etc., to achieve high energy density, wide voltage window, high ratio The effect of surface area

Active Publication Date: 2021-02-19
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the low decomposition voltage (1.23V), it is difficult to increase the energy density of SC

Method used

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  • Preparation method of three-dimensional boron-nitrogen co-doped layered carbon for water system high-voltage supercapacitor
  • Preparation method of three-dimensional boron-nitrogen co-doped layered carbon for water system high-voltage supercapacitor
  • Preparation method of three-dimensional boron-nitrogen co-doped layered carbon for water system high-voltage supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Three-dimensional boron-nitrogen co-doped layered carbon BNLC 1 The specific preparation process is as follows:

[0025] (1) Pretreatment of reactant: Weigh 4g of potassium borate and 1g of 2-methylimidazole solids and dissolve them in deionized water, slowly add 4g of powdered sweet-scented osmanthus, heat at 60°C for 8 hours, and then heat until the water in the mixture is relatively low. When it is small, it is transferred to the refrigerator to freeze for 24 hours to obtain the reactant.

[0026] (2) Preparation of three-dimensional boron-nitrogen co-doped layered carbon: put the reactant obtained in step (1) into a corundum boat, then place the above-mentioned corundum boat in a tube furnace, and pass in argon gas to exhaust the tube type After the air in the furnace is removed, continue to use argon as the protective gas, heat up to 180°C at a heating rate of 2°C / min, and keep the temperature constant for 60 minutes; then heat to 600°C at a heating rat...

Embodiment 2

[0027] Embodiment 2: three-dimensional boron nitrogen co-doped layered carbon BNLC 2 The specific preparation process is as follows:

[0028] (1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1, the difference is that the quality of boric acid is 8g;

[0029] (2) Preparation of three-dimensional boron-nitrogen co-doped layered carbon: the same method as step (2) in Example 1 was implemented. The resulting three-dimensional boron-nitrogen co-doped layered carbon is denoted as BNLC 2 , XPS test results (such as Figure 2-4 Shown) show that its boron content is 2.01%, nitrogen content is 5.29%. BNLC 2 When used as a supercapacitor electrode material, at 3mol / L Zn(CF 3 SO 3 ) 2 In the electrolyte, when the current density is 0.05A / g, BNLC 2 The capacity is up to 315.3F / g, the energy density is up to 43.8Wh / kg; when the current density is 40A / g, BNLC 2 The capacity is up to 241.1F / g.

Embodiment 3

[0030] Embodiment 3: three-dimensional boron nitrogen co-doped layered carbon BNLC 3 The specific preparation process is as follows:

[0031] (1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1. The difference is that the mass of potassium borate is 12g;

[0032] (2) Preparation of three-dimensional boron-nitrogen co-doped layered carbon: the same method as step (2) in Example 1 was implemented. The resulting three-dimensional boron-nitrogen co-doped layered carbon is denoted as BNLC 3 , its boron content is 1.51%, nitrogen content is 3.54%. BNLC 3 When used as a supercapacitor electrode material, at 3mol / L Zn(CF 3 SO 3 ) 2 In the electrolyte, when the current density is 0.1A / g, BNLC 3 The capacity is up to 275.1F / g, the energy density is up to 38.2Wh / kg; when the current density is 20A / g, NPFC 800 The capacity is up to 204.5F / g.

[0033]The three-dimensional boron-nitrogen co-doped layered carbon prepared in Examples 1-3 wa...

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Abstract

The invention discloses a preparation method of three-dimensional boron-nitrogen co-doped three-dimensional layered carbon for a water system high-voltage supercapacitor, and belongs to the technicalfield of carbon material preparation. According to the method, osmanthus fragrans is used as a carbon source, a potassium borate activator and 2-methylimidazole are used as a nitrogen doping agent; the method comprises the following steps: dissolving osmanthus fragrans in a mixed solution of potassium borate and 2-methylimidazole, heating, freeze-drying, transferring the obtained mixture to a corundum boat, placing the corundum boat in a horizontal tubular furnace, and heating in an argon atmosphere to prepare the three-dimensional boron-nitrogen co-doped layered carbon. The specific surface area of the obtained three-dimensional boron-nitrogen co-doped layered carbon is high, and when the three-dimensional boron-nitrogen co-doped layered carbon is used as a supercapacitor electrode material, the three-dimensional boron-nitrogen co-doped layered carbon shows ultrahigh capacity and excellent rate capability. The three-dimensional boron-nitrogen co-doped layered carbon for a supercapacitor is directly prepared by adopting a one-step method, and has the advantages that the raw materials are cheap and easy to obtain, the process route is simple and convenient, acid and alkali are not used in the preparation process, and the obtained product is good in performance.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a method for preparing a three-dimensional boron-nitrogen co-doped layered carbon for a water system high-voltage supercapacitor. Background technique [0002] The massive consumption of fossil fuels forces people to seek new energy sources, such as wind energy, solar energy, tidal energy, and geothermal energy. However, the harvesting of these energies requires new energy conversion and storage devices. As the most promising energy conversion and storage devices, supercapacitors (SCs) have attracted attention due to their long cycle life, excellent physicochemical stability, and high power density. However, the low energy density limits the application of SC, according to E=0.5CV 2 , the energy density of SCs can be increased by increasing the specific capacitance and / or increasing the voltage window. The voltage window of ionic liquids can rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/34H01G11/44
CPCC01B32/05H01G11/24H01G11/44H01G11/34Y02E60/13
Inventor 魏风郑建东张伟钢王俊海
Owner CHUZHOU UNIV
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