Preparation method of spirulina-based carbon material for supercapacitor

A technology of supercapacitor and spirulina, applied in the field of preparation of spirulina-based carbon materials, can solve the problems of cumbersome, complicated and time-consuming preparation process, high cost and pollution, etc.

Active Publication Date: 2021-07-06
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of external doping generally includes multiple steps such as pre-carbonization, activation, and doping, and the preparation process is complicated, time-consuming and cumbersome.
These methods usually involve substantial energy consumption, tedious steps and extensive corrosion, resulting in high cost and pollution
At present, there is no report on the preparation of activated carbon materials for supercapacitors by using spirulina as a precursor and activated by potassium oxalate.

Method used

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  • Preparation method of spirulina-based carbon material for supercapacitor
  • Preparation method of spirulina-based carbon material for supercapacitor
  • Preparation method of spirulina-based carbon material for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Evenly disperse 0.5 g of spirulina into 100 mL of distilled water, add 0.75 g of potassium oxalate under stirring, and keep stirring continuously for 24 hours.

[0041] (2) The above mixture was centrifuged to collect the precipitate, and freeze-dried for 24 hours.

[0042] (3) Put the product under air at 2°C min -1 The temperature was raised to 200°C at a constant rate for 1h. Then, at N 2 Under the atmosphere, at 2°C min -1The temperature was raised to 600°C at a constant rate and kept at a constant temperature for 120 minutes. Finally, the material was fully washed with hydrochloric acid solution until the pH was 7, then washed with deionized water and ethanol, and dried at 60°C to constant weight to obtain the spirulina carbon material.

[0043] figure 1 Microscopic image of spirulina. like figure 1 It can be seen that the spirulina presents a curved cylindrical shape and is evenly and widely distributed in the solution.

[0044] figure 2 and 3 It is...

Embodiment 2

[0068] With the spirulina carbon material that embodiment 1, comparative example 1 and 2 make respectively as active material, make working electrode, it is carried out electrochemical performance test, comprises the following steps:

[0069] 1) The active material, conductive graphite and binder polytetrafluoroethylene (PTFE) were mixed with an appropriate amount of ethanol at a mass ratio of 8:1:1, and then coated on foamed nickel (1×1cm 2 ) to obtain the working electrode.

[0070] 2) Dry the nickel foam working electrode in an oven at 60°C to constant weight, and then press it into a tablet under a pressure of 10Mpa.

[0071] 3) Prepare working electrode, reference electrode (silver-silver chloride electrode), counter electrode (platinum electrode), salt bridge and 6M KOH electrolyte, and assemble a three-electrode system.

[0072] Figure 14 The galvanostatic charge and discharge curves of the spirulina carbon electrode material prepared for Example 1, Comparative Examp...

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Abstract

The invention discloses a preparation method of a spirulina-based carbon material for a supercapacitor. The method comprises the following steps: according to the mass ratio of potassium oxalate to spirulina being 1.5:1, stirring spirulina and potassium oxalate in water until the mixture is uniformly mixed, carrying out centrifugal separation, collecting a precipitate, carrying out freeze drying, then calcining the dried product in an air atmosphere at 200 DEG C, and then carbonizing the dried product in an N2 atmosphere at 500-800 DEG C to obtain the three-dimensional porous spirulina-based carbon material. According to the prepared spirulina-based carbon material, a more effective folded porous carbon structure is generated through simple stirring and reaction of potassium oxalate, rich active sites and smooth diffusion channels are provided, the charge migration rate is increased, the volume effect in the electrochemical energy storage process is relieved, and the spirulina-based carbon material can be used as an electrode material to be applied to supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials, and relates to a preparation method of a spirulina-based carbon material used for a supercapacitor. Background technique [0002] With the development of consumer electronics, electric vehicles and pulse technology, there is an increasing demand for supercapacitors with long service life, high Coulombic efficiency and fast charging / discharging. Based on their energy storage mechanism, supercapacitors can be divided into two categories: electric double layer capacitors and pseudocapacitors. The electric double layer capacitance is mainly derived from the adsorption and detachment of ions at the electrode / electrolyte interface. Carbon materials have been widely used as electrode materials for supercapacitors due to their excellent electrical conductivity, customizability, and multifunctionality. [0003] In general, carbon material precursors are usually derived from by...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/32
CPCH01G11/86H01G11/32Y02E60/13
Inventor 郑雨婧杨宁张淮浩赵静
Owner YANGZHOU UNIV
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