Aperture-adjustable insoluble alginate-based supercapacitor activated carbon and one-step carbonization preparation method

A technology of alginate and supercapacitor, applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problems of single product structure, low capacitance performance, low manufacturing cost, etc., and achieve simple operation and high specific capacitance , the effect of reducing the volume

Inactive Publication Date: 2017-12-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0009] In order to solve the problems of serious pollution in the preparation process, many steps, single product structure, low capacitance performance and high cost in the prior art, the present invention proposes an insoluble alginate-based supercapacitor activated carbon with adjustable pore size and its one-step Carbonization preparation method, the preparation process of this method is clean, the steps are simple, the pore structure of the product can be adjusted, the capacitance performance is high, and the manufacturing cost is low

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  • Aperture-adjustable insoluble alginate-based supercapacitor activated carbon and one-step carbonization preparation method
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  • Aperture-adjustable insoluble alginate-based supercapacitor activated carbon and one-step carbonization preparation method

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preparation example Construction

[0038] An insoluble alginate-based activated carbon material for an adjustable aperture supercapacitor and a one-step carbonization preparation method thereof, comprising the following steps:

[0039] The first step, raw material preparation: soak seaweed, wash, crush, then enzymatically hydrolyze solid-liquid separation, add sodium carbonate and water for transformation, extract alginic acid, remove impurities, and dry; commercially available alginic acid can also be used directly.

[0040] The second step is the preparation of the precursor: the obtained alginic acid is configured as a solution, and a certain concentration of CaCl is added 2 / CuCl 2 / ZnCl 2 The aqueous solution is fully stirred to prepare the calcium alginate / copper / zinc precursor. Finally, the obtained samples were fully washed and dried in an oven.

[0041] The third step, carbonization: put the obtained precursor in a quartz boat, put it into a tube furnace, and pass nitrogen gas. Raise the temperatur...

Embodiment 1

[0047] (1) Raw material preparation: soak seaweed, wash, crush, enzymatically hydrolyze solid-liquid separation, add sodium carbonate and water for transformation, extract alginic acid, remove impurities, and dry; add 1%wt CaCl to the obtained alginic acid 2 Thorough stirring is carried out to prepare calcium alginate divalent chelated metal insoluble alginate precursor. Finally, the obtained samples were fully washed and dried in an oven.

[0048] (2) Carbonization: put calcium alginate in a quartz boat and put it into a tube furnace, feed nitrogen gas at a flow rate of 1L / min, raise the temperature from room temperature to 700°C at a heating rate of 10°C / min, keep it for 60min, and cool down naturally to room temperature.

[0049] (3) After the one-step carbonization is completed, the cooled activated carbon sample is washed with hydrochloric acid aqueous solution with a volume ratio of 1:9, then washed with deionized water for 2-4 times, and finally placed in an oven to dr...

Embodiment 2

[0051] (1) Preparation of raw materials: soak seaweed, wash, crush, enzymatically hydrolyze solid-liquid separation, add sodium carbonate and water for transformation, extract alginic acid, remove impurities, and dry; add 5% wt of CuCl to the obtained alginic acid 2 Thorough stirring is carried out to prepare calcium alginate divalent chelated metal insoluble alginate precursor. Finally, the obtained samples were fully washed and dried in an oven.

[0052] (2) Carbonization: Put copper alginate in a quartz boat and put it into a tube furnace, feed nitrogen gas at a flow rate of 1L / min, raise the temperature from room temperature to 800°C at a heating rate of 10°C / min, keep it for 60min, and cool down naturally to room temperature.

[0053] (3) After the one-step carbonization is completed, the cooled activated carbon sample is washed with 1+9 hydrochloric acid, then washed 2-4 times with deionized water, and finally placed in an oven for drying, cooling, and grinding to obtai...

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Abstract

The invention discloses aperture-adjustable insoluble alginate-based supercapacitor activated carbon and a one-step carbonization preparation method. The insoluble alginate-based supercapacitor activated carbon with a specific aperture distribution range is prepared by virtue of a one-step carbonization method. An insoluble alginate precursor is prepared by chelating different types of divalent metal ions. The precursor is further carbonized to generate an activated carbon material with a specific hole structure. In the process of heating carbonization, holes are formed by virtue of metal ions through an occupying effect, and then intensively-distributed 2nm-5nm medium holes and a certain amount of 10nm-50nm big holes are obtained. Meanwhile, the activated carbon material contains a large amount of surface oxygen-containing groups and has extremely high pseudocapacitance. Meanwhile, the bulk density is high, the volume specific capacitance is high, and the size of a supercapacitor device can be obviously reduced in practical application. The method is suitable for preparing supercapacitor activated carbon materials with different aperture distribution ranges from any insoluble divalent metal chelated alginate through one-step carbonization.

Description

technical field [0001] The invention relates to an insoluble alginate-based supercapacitor activated carbon with adjustable pore size and a one-step carbonization preparation method thereof, in particular to a preparation of an insoluble alginate raw material and a precursor, and one-step carbonization process conditions. Background technique [0002] Supercapacitors have the characteristics of fast charging speed, high power density, and long life. They are the most effective way to solve the power supply for electric vehicles. It can be used not only as the sole power source for electric vehicles, but also as an auxiliary power source for electric vehicles. Supercapacitors can also be used for power devices such as photovoltaic battery storage, grid stabilization, and radio transmission, as well as starting energy for tanks and rocket traction; the United States, Europe, Japan, etc. are also conducting research on supercapacitors. [0003] The alginate used in this experi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318H01G11/34H01G11/44
CPCY02E60/13H01G11/44C01P2002/80C01P2006/12C01P2006/17C01P2006/40H01G11/34
Inventor 孙康冷昌宇蒋剑春李继辉卢辛成陈超
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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