Porous carbon, and preparation method and applications thereof

A porous carbon, conditioned technology, used in the manufacture of hybrid/electric double-layer capacitors, electrical components, electrolytic capacitors, etc., can solve the problems of poor cycle performance, low capacity, and inability to be widely used in conductive polymers, and achieve a green preparation method. High-capacity, suitable for mass production

Inactive Publication Date: 2010-12-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these materials, RuO 2 Although it has a high capacitance, it is difficult to obtain practical applications due to its high price; conductive polymers cannot be widely used due to their poor cycle performance and low capacity under high power; porous activated carbon materials have a large The advantages of specific surface area, good chemical inertness and no pollution are considered to be the materials of choice for the preparation of electrochemical capacitor electrodes.
Although traditional porous activated carbon materials have the advantages of high specific surface area, good chemical inertness, no pollution and high theoretical capacity, etc., the porous activated carbon materials are composed of small pores with different pore structures. Suitable, usually about half of the surface is not electrochemically active

Method used

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  • Porous carbon, and preparation method and applications thereof
  • Porous carbon, and preparation method and applications thereof
  • Porous carbon, and preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1, preparation porous carbon

[0033] Weigh 10g alginic acid (purchased from Sinopharm Chemical Reagent Co., Ltd.), place it in a tube furnace, and 2 Under the atmosphere, calcined at 800° C. for 5 hours with a heating and cooling rate of 10° C. / min to obtain a porous carbon precursor. The precursor of the obtained porous carbon was then treated with 1 mol L -1 Hydrofluoric acid was treated at 50°C for 6 hours to obtain wet porous carbon. Finally, the wet porous carbon was dried at 80° C. for 5 hours under vacuum conditions to obtain porous carbon.

Embodiment 2

[0034] Embodiment 2, preparation porous carbon

[0035] Weigh 8g of lithium alginate (made by reacting equimolar alginic acid (purchased from Sinopharm Chemical Reagent Co., Ltd.) with lithium hydroxide (purchased from Beijing Chemical Reagent Company)) and 6g of sodium alginate (purchased from Sinopharm Chemical Reagent Co., Ltd.), mixed evenly, placed in a tube furnace, and calcined at 600°C for 6 hours under an Ar atmosphere, with a heating and cooling rate of 20°C / min, to obtain a precursor of porous carbon. The resulting porous carbon precursor was then treated with water at 25 °C for 6 hours to obtain wet porous carbon. Finally, the wet porous carbon was dried in air at 100° C. for 5 hours to obtain porous carbon.

Embodiment 3

[0036] Embodiment 3, preparation porous carbon

[0037] Weigh 4g of alginic acid (purchased from Sinopharm Chemical Reagent Co., Ltd.), 3g of magnesium alginate (made by reacting equimolar sodium alginate (purchased from Sinopharm Chemical Reagent Co., Ltd.) with magnesium chloride) and 3g of calcium alginate (with Equimolar sodium alginate (purchased from Sinopharm Group Chemical Reagent Co., Ltd.) reacted with calcium chloride) was mixed evenly and placed in a tube furnace. 2 In an atmosphere with a volume ratio of :Ar of 1:1, calcining at 900° C. for 4 hours, with a heating and cooling rate of 5° C. / min, to obtain a precursor of porous carbon. Then the obtained precursor of porous carbon was mixed with 5mol·L -1 Nitric acid was treated at 80 °C for 3 hours to obtain wet porous carbon. Finally, the wet porous carbon in N 2 Dry at 80°C for 6 hours to obtain porous carbon.

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Abstract

The invention discloses a porous carbon, and a preparation method and applications thereof. The preparation method of the porous carbon comprises the following steps: (1) under the non-oxidizing condition, calcining at least one of alginic acid, sodium alginate, kalium alginate, lithium alginate, magnesium alginate and calcium alginate to obtain the porous carbon precursor; (2) treating the porous carbon precursor, which is obtained in step (1), with water or acid solution to obtain wet porous carbon; and (3) drying the wet porous carbon obtained in step (2) to obtain porous carbon. When the porous carbon is used as an electrode material for electrochemical capacitors, due to abundant multilevel pore structures and oxygen functional groups, the porous carbon can fully utilize the surface area in the structures and provide additional pseudo capacitance, so that the porous carbon has the advantages of higher capacity, energy density, power density and electrochemical stability. The preparation method is green and environment-friendly, and is very suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of nanometer materials and electrochemical capacitors, in particular to a porous carbon and its preparation method and application. Background technique [0002] With the increasing shortage of petroleum energy and the gradual enhancement of people's awareness of environmental protection, the use of electric vehicles or low-pollution hybrid vehicles as a means of transportation has attracted more and more attention. However, electric vehicles need high power output and storage of energy during starting, accelerating and braking. At present, the main energy storage batteries on the market (including lithium-ion batteries, nickel-metal hydride batteries, and lead-acid batteries, etc.) cannot meet such high power requirements, and electrochemical capacitors are devices that can charge and discharge at high power. However, such requirements can be met. [0003] There are three main materials that can be used as electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01G9/042H01G9/058H01G11/86
CPCY02E60/13
Inventor 郭玉国吴兴隆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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