Method for self-template and self-doping preparation of supercapacitor phosphorus rich mesoporous carbon

A technology for supercapacitors and phosphorus-rich media, applied in the field of phosphorus mesoporous carbons, to achieve the effects of improving conductivity and wettability, reducing volume shrinkage, and improving rate performance

Active Publication Date: 2018-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The work of doping carbon materials mainly focuses on oxygen and nitrogen atoms, while there are relatively few studies on phosphorus doping

Method used

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  • Method for self-template and self-doping preparation of supercapacitor phosphorus rich mesoporous carbon
  • Method for self-template and self-doping preparation of supercapacitor phosphorus rich mesoporous carbon
  • Method for self-template and self-doping preparation of supercapacitor phosphorus rich mesoporous carbon

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Weigh 30g of calcium and magnesium phytate in a clean nickel boat, place it in the center of the tube furnace, and blow it with high-purity nitrogen for 30 minutes to force out the air in the tube;

[0035] (2) Under the protection of high-purity nitrogen, raise the temperature of the tube furnace to 1100°C at a heating rate of 15°C / min, keep the temperature constant for 2 hours, and cool naturally to room temperature (such as figure 1 The TEM image of the carbonized product before washing is shown, and the black small molecular salt impurities are evenly distributed in the carbon matrix material);

[0036] (3) Take out the nickel boat, put the carbonized product into a three-necked flask filled with 1mol / L sulfuric acid, heat and boil for 3 hours, filter and wash until neutral, add deionized water and boil for 3 hours;

[0037] (4) Suction filtration, drying in a blast oven at 90°C for 11 hours to obtain the phosphorus-rich mesoporous carbon electrode material;

...

Embodiment 2

[0041] (1) Weigh 25g of calcium and magnesium phytate in a clean nickel boat, place it in the center of the tube furnace, and blow it with high-purity nitrogen for 30 minutes to force out the air in the tube;

[0042] (2) Under the protection of high-purity nitrogen, raise the temperature of the tube furnace to 500°C at a heating rate of 5°C / min, keep the temperature for 3 hours, and naturally cool to room temperature;

[0043] (3) Take out the nickel boat, put the carbonized product into a three-necked flask filled with 3mol / L phosphoric acid, heat and boil for 2.5h, filter and wash until neutral, add deionized water and boil for 2.5h;

[0044] (4) Suction filtration, drying in a blast oven at 100°C for 12 hours to obtain phosphorus-rich mesoporous carbon electrode materials;

[0045] (5) figure 2 It is the SEM and TEM images of the porous carbon material. It can be seen from the SEM image that the carbon material with a honeycomb porous structure is obtained directly by hi...

Embodiment 3

[0048] (1) Weigh 27g of zinc phytate in a clean nickel boat, place it in the center of the tube furnace, blow it with high-purity nitrogen for 30 minutes, and force out the air in the tube;

[0049] (2) Under the protection of high-purity nitrogen, raise the temperature of the tube furnace to 900°C at a heating rate of 15°C / min, keep the temperature constant for 3 hours, and cool down to room temperature naturally;

[0050] (3) Take out the nickel boat, put the carbonized product into a three-necked flask filled with 4mol / L oxalic acid, heat and boil for 3 hours, filter and wash until neutral, add deionized water and boil for 3 hours;

[0051] (4) Suction filtration, drying in a blast oven at 110°C for 10 hours to obtain phosphorus-rich mesoporous carbon electrode materials;

[0052] (5) Carry out XPS test analysis on the material, the results are as follows Figure 4 As shown, the peak spectrum of P2p shows that P is mainly in the form of [PO 3 ] - Form exists mainly, and ...

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Abstract

The invention provides a method for self-template and self-doping direct high temperature carbonization preparation of phosphorus rich mesoporous carbon. The phytate (i.e. cyclohexanol phosphate saltor inositol Hexaphosphate) acts as the precursor, and the high temperature molecules are recombined and crosslinked under inert gas protection so that the compound of porous carbon wrapped nanometer pyrophosphate particles is obtained. Acid pickling and washing are performed on the compound to remove the nano-template agent so that the phosphorus rich porous carbon is prepared through drying. Thecarbon material has the cellular mesoporous structure, the specific area is 400-1500m2 / g, the aperture distribution is uniform within 3-20nm, the pore volume is within 0.6-1.7cm3 / g and the phosphoruscontent is 2.3%-16%. The phosphorus rich mesoporous carbon is used as the supercapacitor electrode material and has the characteristics of high area specific capacitance, excellent rate performance and wide potential window (0-1.8V).

Description

technical field [0001] The invention relates to a self-template and self-doping preparation of phosphorus-rich mesoporous carbon for supercapacitors. Background technique [0002] Supercapacitors, also known as electric double layer capacitors, have the advantages of high charge and discharge efficiency, long cycle life, and fast charge and discharge capabilities, and are used as potential high-power power sources in digital communications, aerospace, electric vehicles, etc. . Due to the performance of supercapacitors (such as low energy density), their further development is limited, so improving the energy density is an urgent problem that needs to be solved. [0003] Carbon materials are rich in resources, exist in various forms in nature, and have controllable structure, high conductivity and ion adsorption. . Therefore, it plays an extremely important role in the field of electrochemistry and is the most widely used electrode material for supercapacitors. There are ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/32H01G11/24H01G11/44H01G11/30
CPCH01G11/24H01G11/30H01G11/32H01G11/44H01G11/86Y02E60/13
Inventor 徐斌胡龙丰
Owner BEIJING UNIV OF CHEM TECH
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