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A method for preparing carbide-derived carbon by molten salt electrolysis

A carbide-derived carbon and molten salt electrolysis technology, which is used in carbon preparation/purification, electrolysis process, electrolysis components, etc. problems, to achieve the effect of superior electrochemical performance, stable electrolysis process, and simplified preparation process

Inactive Publication Date: 2016-05-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are all intermittent, the preparation process is complex, the production cycle is long and the energy consumption is high; the environmental pollution is relatively serious; thus the price of carbide-derived carbon is higher, which limits the wide application of carbide-derived carbon

Method used

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  • A method for preparing carbide-derived carbon by molten salt electrolysis
  • A method for preparing carbide-derived carbon by molten salt electrolysis
  • A method for preparing carbide-derived carbon by molten salt electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1.5g of titanium carbide powder (2μm, 98%), mold it into a sheet under 3MPa pressure, then put it into a sintering furnace, fill it with argon, heat it up to 800°C for 8h, put the sintered titanium carbide sheet into Use electronically conductive materials to connect and lead out as positive electrodes, and use high-purity high-density graphite rods (carbon content >99.99%, density 1.5g / cm 3 ) as the negative electrode, in the electrolytic furnace with a ceramic crucible as the electrolytic cell, weigh 48 grams of potassium chloride, 120 grams of magnesium chloride, and 72 grams of sodium chloride (potassium chloride: magnesium chloride: sodium chloride = 0.2: 0.5: 0.3) total Put 240 grams into a ceramic crucible, put argon gas into the crucible resistance furnace, heat up to 400°C to melt it, put the positive and negative electrodes into the ceramic crucible, connect the positive and negative electrodes to 3.2V with DC stabilized voltage power supply, and perform ...

Embodiment 2

[0033] Weigh 1.5 grams of boron carbide powder (2μm, 98%), mold it into a tablet under a pressure of 5 MPa, then put it into a sintering furnace, fill it with argon, heat it up to 850 ° C for 7 hours, and put the sintered boron carbide sheet into In the positive pole basket as the positive pole, high-purity high-density graphite rods (carbon content>99.99%, density 1.5g / cm 3 ) as the negative electrode, use the ceramic crucible as the electrolytic cell in the electrolytic furnace, weigh 240 grams of magnesium chloride and put it into the ceramic crucible, pass argon gas into the crucible resistance furnace, heat up to 750 ° C and stabilize, put the positive and negative electrodes into the In the ceramic crucible, the DC stabilized power supply is connected to the positive and negative poles and energized at 3.0V for 45 hours of electrolysis. After the reaction, the product obtained from the positive electrode was sequentially washed with deionized water, ultrasonically assist...

Embodiment 3

[0035] Weigh 1.5 grams of silicon carbide powder (2μm, 98%), mold it into a tablet under a pressure of 8MPa, then put it into a sintering furnace, fill it with argon, heat it up to 900 ° C for 5 hours, and put the sintered silicon carbide chip into In the positive pole basket as the positive pole, high-purity high-density graphite rods (carbon content>99.99%, density 1.5g / cm 3 ) as the negative electrode, use the ceramic crucible as the electrolytic cell in the electrolytic furnace, weigh 240 grams of calcium chloride and put it into the ceramic crucible, pass argon gas into the crucible resistance furnace, raise the temperature to 900°C and stabilize, then put the positive and negative electrodes Put it into the crucible, connect the positive and negative poles of the DC stabilized power supply to 2.6V, and perform electrolysis for 30 hours. After the reaction, the product obtained from the positive electrode was sequentially washed with deionized water, ultrasonically assist...

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Abstract

The invention discloses a method for preparing carbide derived carbon by a fused salt electrolysis method. The method mainly comprises the steps that metal carbide serves as a raw material, and is subjected to die pressing sintering to form a metal carbide sheet to serve as an anode; by taking fused salt as an electrolyte, and a high-purity and high-density graphite rod as a cathode, fused salt electrolysis is performed in an electrolysis furnace in an argon atmosphere with the electrolysis temperature of 400-1300 DEG C, the electrolysis voltage of 1.8-3.2V, and the electrolysis time of 2-60h; after the electrolysis, an anode product is taken out, and subjected to water washing, ultrasonic-assisted pickling, water washing and drying treatment; and the carbide derived carbon is prepared. According to the method, the low-cost metal carbide can serve as the raw material for preparing the carbide derived carbon by the fused salt electrolysis method, so that a preparation technology is simplified; the cost is lowered; and the prepared carbide derived carbon serves as an electrode material of a supercapacitor, and has high specific capacity and good cycling stability.

Description

technical field [0001] The invention relates to a preparation method of carbide-derived carbon. technical background [0002] Carbide-derived carbons have excellent properties such as relatively high specific surface area, tunable pore size distribution, and good electronic conductivity, so they are used in gas storage, molecular sieves, catalyst supports, adsorbents, electrodes for batteries and supercapacitors, water / air filtration and Potential applications in fields such as medical devices have become very important. At present, the main preparation methods of carbide-derived carbon are: high temperature pyrolysis method, halogen erosion method, supercritical fluid erosion method, etc. These methods are intermittent, the preparation process is complicated, the production cycle is long and the energy consumption is high; the environmental pollution is relatively serious; thus resulting in the high price of carbide-derived carbon, which limits the wide application of carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C01B31/02C01B32/05
Inventor 秦秀娟张磊邵光杰
Owner YANSHAN UNIV
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