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Preparation method of seaweed-based activated carbon for supercapacitor

A supercapacitor and activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of materials that cannot meet performance requirements, lack of artificial regulation of pore structure, etc., and achieve good energy storage and release capabilities, easy Operation, effect of large activation area

Active Publication Date: 2015-10-28
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this direct carbonization method only utilizes the original pore structure and surface chemical properties of seaweed, lacks the artificial control of the target material pore structure, and the obtained material cannot meet the performance requirements.

Method used

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  • Preparation method of seaweed-based activated carbon for supercapacitor
  • Preparation method of seaweed-based activated carbon for supercapacitor
  • Preparation method of seaweed-based activated carbon for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Present embodiment relates to a kind of preparation method of activated carbon for supercapacitor based on seaweed, described method is as figure 2 shown, including the following steps:

[0034] Step 1, immerse 30g macroalgae into 0.001mol / L Ni(N0 3 ) 2 solution, let stand for 1 hour. Dried the impregnated macroalgae, calcined at 400°C for 1 hour under vacuum, added 1L hydrochloric acid (3mol / L), stirred for 2 hours, filtered, and dried to obtain carbonized macroalgae powder;

[0035] Step 2: Activate 3 g of carbonized macroalgae powder with water vapor at 750° C. for 1 hour to obtain an activated product;

[0036] 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 carbon.

[0037] Implementation effect: see figure 1 , 2, 3, the impregnated Ni 2+ Afterwards, the algae formed as figure 1 The "egg-box" structure shown, behaves as image 3 The peak pos...

Embodiment 2

[0039] This embodiment relates to a preparation method of activated seaweed carbon for supercapacitors based on seaweed, the method is as follows figure 2 shown, including the following steps:

[0040] Step one, will grow in Ca-rich 2+ The seawater seaweed was directly calcined at 600°C for 2 hours under vacuum, added to 1L of hydrochloric acid (5mol / L), stirred for 2 hours, filtered, and dried to obtain the carbonized powder of the seaweed;

[0041] Step 2, adding 3g of undaria pinnatae carbonized powder into 20ml of KOH (4mol / L), heating at 100°C until evaporated to dryness;

[0042] Step 3, using water vapor to activate the mixture obtained in the above step 2 at 900° C. for 2 hours to obtain an activated product;

[0043] Step 4: Add the activated product obtained in Step 3 into 1L of hydrochloric acid (1mol / L), stir for 2 hours, filter, and dry at 100°C to obtain activated carbon.

[0044] Implementation effect: see Figure 4 , 6 As shown, the obtained activated car...

Embodiment 3

[0046] This embodiment relates to a preparation method of activated seaweed carbon for supercapacitors based on seaweed, the method is as follows figure 2 shown, including the following steps:

[0047] Step 1: Calcining 30 g of kelp at 900° C. for 3 hours under vacuum, adding 1 L of hydrochloric acid (2 mol / L), stirring for 2 hours, filtering, and drying to obtain carbonized kelp powder;

[0048] Step 2, add 3g of kelp carbonized powder into 20ml of KOH (6mol / L), heat at 100°C until evaporated to dryness;

[0049] Step 3, activating the product obtained in the above step 2 at 800°C for 1 hour;

[0050] Step 4: Add the activated product obtained in Step 3 into 1L of hydrochloric acid (1mol / L), stir for 2 hours, filter, and dry at 100°C to obtain activated carbon.

[0051] Implementation effect: see Figure 5 As shown, take 0.1g of activated seaweed carbon, add test materials, conductive carbon black, and binder according to the ratio of 1:1:8, roll it into a film, punch it ...

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Abstract

The invention provides a preparation method of algae-based active carbon for a supercapacitor. The preparation method mainly comprises the steps: firstly, performing crosslinking pretreatment on the surface of algae by using polyvalent metal cations, secondly, preparing a pre-carbonizing intermediate with a mesoporous structure on the surface by using a carbonizing and pickling process, and finally, preparing active carbon through further activating and pickling. According to the preparation method, meso pores are formed in the pre-carbonizing intermediate through crosslinking, and are capable of providing a larger activating area in a subsequent activating process, thus the prepared active carbon is larger in specific surface area, developed in pores, and more beneficial to electrochemical energy storage.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a method for preparing seaweed-based activated carbon for supercapacitors. Background technique [0002] With the global warming and the massive consumption of fossil fuels, it is imperative to control the consumption of fossil fuels and reduce the emission of carbon dioxide. Therefore, the development of new energy has become the key to the sustainable development of the world. The emergence and development of hybrid electric vehicles and pure electric vehicles is the embodiment of this purpose. The most important part of an electric vehicle is the energy storage part, which needs to meet the requirements of large stored energy, light weight, fast charging and discharging, and high stability. [0003] Supercapacitors can meet these requirements. Electrode materials for supercapacitors mainly include: activated carbon materials for energy storage based on surface fast e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/10C01B31/12C01B32/318C01B32/336C01B32/342C01B32/348
Inventor 刘庆雷康丹苗张荻
Owner SHANGHAI JIAOTONG UNIV
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