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Preparation method of alga-based active carbon precursor for super capacitor

A supercapacitor and activated carbon technology, which is applied in the field of electrochemical applications, can solve the problems of large differences in supercapacitor properties, uneven product structure, and difficult industrial preparation, and achieve the effects of lowering temperature, developing pore structure, and improving uniformity

Active Publication Date: 2018-06-01
SHANDONG UNIV
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Problems solved by technology

CN103771408A discloses a method for preparing activated carbon for supercapacitors based on seaweed. First, multivalent metal cations are used to carry out cross-linking pretreatment on the surface of seaweed, and then a pre-carbonized intermediate with a mesoporous structure on the surface is prepared by carbonization and pickling processes. Finally, activated carbon is further activated and pickled to prepare activated carbon, but this method directly treats seaweed with metal cations, and seaweed belongs to a mixture with complex components. This treatment has problems such as incomplete reaction, low cross-linking efficiency, and uneven structure of the obtained product.
[0006] Existing biological materials and agricultural waste, such as coconut husk, rice husk, etc., can obtain electrode materials with developed pore structure by carbonizing and activating these wastes, and their specific surface area can reach 1000-3000m 2 / g, the specific capacitance value of the prepared activated carbon can generally reach 100-300F / g(H 2 SO 4 , KOH, etc.), however, at present, a key problem of activated carbon as an electrode material for supercapacitors is that the specific capacitance value still needs to be improved, and the specific capacitance drops very quickly under the condition of high current charge and discharge.
In addition, although the biomimetic materials prepared by organisms (such as seaweed) as precursors have unique complex multi-level morphology structures, they also have different structural characteristics even in different types of individuals of the same organism, making different types of activated carbon and The properties of the prepared supercapacitors are quite different, it is difficult to homogenize, and it is difficult to realize industrial preparation

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  • Preparation method of alga-based active carbon precursor for super capacitor
  • Preparation method of alga-based active carbon precursor for super capacitor
  • Preparation method of alga-based active carbon precursor for super capacitor

Examples

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Embodiment 1

[0073] The present embodiment relates to a kind of preparation method of activated carbon precursor for supercapacitor based on seaweed, comprises the steps:

[0074] In step 1, the sargassum raw material is washed repeatedly with clean water to remove salt and impurities, dried at 120° C. for 24 hours, crushed, and passed through an 80-mesh sieve.

[0075] Step 2: Weigh 10 g of the Sargassum powder obtained in Step 1, mix it with 80 ml of deionized water, and break the wall under 60 Hz ultrasound for 30 min.

[0076] Step 3: Mix the product obtained in Step 2 with sodium carbonate at a mass ratio of 4:1, and mechanically stir in a water bath at 40°C for 5 hours.

[0077] Step 4, the product obtained in step 3 and CaCl 2 Mix at a mass ratio of 4:1, mechanically stir in a water bath at 40°C for 30 minutes, and dry at 105°C for 48 hours to obtain a seaweed-based precursor.

[0078] Implementation effect: After elemental analysis and EDS analysis, the product obtained is a prec...

Embodiment 2

[0080] The present embodiment relates to a kind of preparation method of activated carbon precursor for supercapacitor based on seaweed, comprises the steps:

[0081] In step 1, the sargassum raw material is repeatedly washed with tap water to remove salt and impurities, dried at 120° C. for 24 hours, crushed, and passed through an 80-mesh sieve.

[0082] Step 2: Weigh 10 g of Sargassum powder obtained in Step 1 and soak in 80 ml of 1% formaldehyde solution for 24 hours.

[0083] Step 3: Mix the product obtained in Step 2 with sodium carbonate at a mass ratio of 4:1, and mechanically stir in a water bath at 40°C for 5 hours.

[0084]Step 4: Combine the product obtained in Step 3 with CaCl 2 Mix at a mass ratio of 4:1, mechanically stir in a water bath at 40°C for 30 minutes, and dry at 105°C for 48 hours to obtain a seaweed-based precursor.

[0085] Implementation effect: After elemental analysis and EDS analysis, the product obtained is a precursor based on calcium alginate...

Embodiment 3

[0087] This example relates to a method for preparing activated carbon for supercapacitors based on seaweed-based precursors, comprising the following steps:

[0088] Step 1: Weigh 20 g of the precursor prepared in Example 1, place it in a tube furnace, raise the temperature up to 600° C. at a rate of 5° C. / min, and keep at this temperature for 2 hours. Nitrogen is used as a protective gas, and the rate of feeding is 1.5L / min.

[0089] In step 2, the product obtained in step 1 was acid-washed with 15 wt% hydrochloric acid at 80°C, then washed with deionized water at 80°C until neutral, and dried at 105°C for 12 hours to obtain seaweed-based activated carbon.

[0090] Implementation effect: The electrode material for supercapacitors prepared by mixing the carbon material with the conductive agent and the binder at a mass ratio of 8:1:1 was used for constant current charge and discharge tests with 6mol / L KOH as the electrolyte. The specific capacitance value reaches 168F / g when...

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Abstract

The invention discloses a preparation method of an alga-based active carbon precursor for a super capacitor. The method mainly comprises the following steps: ultrasound and swelling and other methodsare firstly utilized for carrying out cell wall breaking of alga raw materials, so that alginate in pectin of cell walls and between cells is dissolved; a digestion process is further carried out, under the heating condition with alkali, alginates which are not dissolved in water are converted into water soluble alkali metals and extracted; a cross-linking agent is introduced, and precipitation ofpolymers is formed; washing and filtering steps are carried out, in order to discharge a large amount of inorganic salts, pigments and other impurities which are dissolved in water along with water,and the precursor is obtained. The precursor is carbonized and activated in order to obtain the active carbon material with reasonable pore structure, abundant channels, and massive specific surface area, in order to substantially improve capacity and electrochemical performance of the super capacitor with extremely good industrial application prospects.

Description

technical field [0001] The invention belongs to the field of electrochemical applications, relates to the technical field of preparation of supercapacitor electrode materials, in particular to a method for preparing a seaweed-based activated carbon precursor for supercapacitors and its application in supercapacitor electrode materials. Background technique [0002] A supercapacitor is a new type of energy storage and conversion device between traditional capacitors and secondary batteries. It has the characteristics of high energy and power density, stable cycle life, fast charge and discharge process, excellent rate characteristics and temperature characteristics, etc. The system and other aspects have very broad application prospects. [0003] Supercapacitors are divided into electric double layer capacitors and pseudocapacitors. The former uses the interfacial electric double layer capacitance formed between the electrode and the electrolyte to store energy, so the elec...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348B82Y40/00H01G11/24H01G11/34H01G11/44
CPCB82Y40/00C01P2002/72C01P2004/03C01P2006/12C01P2006/14C01P2006/16C01P2006/17C01P2006/40H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 韩奎华李金晓赵建立李诗杰李明
Owner SHANDONG UNIV
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