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Preparation method for graphitized porous carbon for supercapacitor

A supercapacitor and graphitization technology, applied in the preparation/purification of carbon, etc., can solve the problems of capacitive surface area limitation, poor conductivity, and charge transfer constraints, and achieve strong energy storage and release capabilities, easy operation, and low cost. Effect

Active Publication Date: 2013-05-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the directly carbonized seaweed carbon does not have enough micropores, the surface area that plays a role in the capacitance performance is limited, and the composition is still mainly amorphous carbon, which has poor conductivity, making its charge under high current density Delivery is constrained

Method used

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  • Preparation method for graphitized porous carbon for supercapacitor
  • Preparation method for graphitized porous carbon for supercapacitor

Examples

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Embodiment 1

[0030] This embodiment relates to a preparation method of graphitized porous carbon for supercapacitors, comprising the following steps:

[0031] Step 1: Calcinate 30g of macroalgae at 400°C for 1 hour under vacuum, add 1L of hydrochloric acid (3mol / L), stir for 2 hours, filter, and dry to obtain carbonized seaweed powder;

[0032] Step 2: Add 3g of carbonized seaweed powder into 20ml of KOH (1mol / L), heat at 100°C until evaporated to dryness, and calcinate at 450-500°C to obtain an activated product;

[0033] Step 3: Add the activated product obtained in the above step 2 into 1L of hydrochloric acid (1mol / L), stir for 2 hours, filter, and dry at 100°C to obtain activated seaweed carbon.

[0034] Step 4, take 1g of the activated seaweed carbon obtained in the above step 3 and add 0.2mol / L Ni(NO 3 ) 2 In acetone solution, ultrasonic treatment was performed for 1 hour to obtain product A;

[0035] Step 5: filter the product A, dry at 80°C, calcinate at 900°C at high temperatu...

Embodiment 2

[0038] This embodiment relates to a preparation method of graphitized porous carbon for supercapacitors, comprising the following steps:

[0039] Step 1: Calcinate 30g of Undaria pinnatifida under vacuum at 600°C for 2 hours, add 1L of hydrochloric acid (5mol / L), stir for 2 hours, filter, and dry to obtain carbonized seaweed powder;

[0040] Step 2: Add 3g of carbonized seaweed powder into 20ml of KOH (4mol / L), heat at 100°C until evaporated to dryness, and calcinate at 450-800°C to obtain an activated product;

[0041] Step 3: Add the activated product obtained in the above step 2 into 1L of hydrochloric acid (1mol / L), stir for 2 hours, filter, and dry at 100°C to obtain activated seaweed carbon.

[0042] Step 4, take 1g of the activated seaweed carbon obtained in the above step 3 and add 0.5mol / L Co(NO 3 ) 2 In ethanol solution, sonicated for 1 hour to obtain product A;

[0043] Step 5: Filter the product A, dry at 80°C, calcinate at 700°C at high temperature, wash with 1...

Embodiment 3

[0046] This embodiment relates to a preparation method of graphitized porous carbon for supercapacitors, comprising the following steps:

[0047]Step 1: Calcinate 30g of seaweed at 900°C for 3 hours under vacuum, add 1L of hydrochloric acid (2mol / L), stir for 2 hours, filter, and dry to obtain carbonized seaweed powder;

[0048] Step 2: Add 3g of carbonized seaweed powder into 20ml of NaOH (7mol / L), heat at 100°C until evaporated to dryness, and calcinate at 450-900°C to obtain an activated product;

[0049] Step 3: Add the activated product obtained in the above step 2 into 1L of hydrochloric acid (1mol / L), stir for 2 hours, filter, and dry at 100°C to obtain activated seaweed carbon.

[0050] Step 4, take 1g of the activated seaweed carbon obtained in the above step 3 and add 0.5mol / L FeCl 3 In aqueous solution, sonicated for 1 hour to obtain product A;

[0051] Step 5: filter the product A, dry at 80°C, calcinate at 1000°C, wash with 1 L of hydrochloric acid (1mol / L), and...

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Abstract

The invention provides a preparation method for graphitized porous carbon for a supercapacitor. The preparation method comprises a step I of adding activated seaweed carbon to a transition metal salt solution, and uniformly mixing the activated seaweed carbon with the solution to obtain a product A; and a step II of obtaining the final product graphitized porous carbon through filtering, drying, high-temperature roasting and acid-washing of the product A. According to the preparation method provided by the invention, the activated porous carbon is soaked in the metal salt solution, a catalyst precursor is introduced for treatment at high temperature to obtain a graphitized nanometer structure inside the porous carbon. The seaweeds are used as raw materials, loaded with metal nanometer particles and catalyzed at high temperature to obtain the graphitized porous carbon, so that the specific surface area of the porous carbon material is remarkably improved, and good load storage capacity is obtained; and moreover, the graphitized structure is introduced, so that the integral conductivity of the material is greatly improved, and the material still has good energy storage and release ability under high current density.

Description

technical field [0001] The invention relates to a method in the technical field of supercapacitors, in particular to a method for preparing graphitized porous carbon for supercapacitors. Background technique [0002] Supercapacitor is a new type of electric energy storage device with high power density, high energy density and long service life. Due to its fast charging and discharging characteristics, it has great application potential in the fields of hybrid electric vehicles, pure electric vehicles, wind power generation, cranes, etc., and has received extensive attention in recent years. [0003] The working principle of supercapacitors involves two different mechanisms. One is the electric double layer capacitance based on the electric double layer at the solution interface, and the other is the pseudocapacitance based on the fast Faradaic process at the material interface. The energy storage mechanism of electric double layer capacitors is the rapid accumulation proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B32/05
Inventor 刘庆雷康丹苗张荻
Owner SHANGHAI JIAO TONG UNIV
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