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Method for preparing porous carbon from scallions and waste

A porous carbon and waste technology, which is applied in the field of porous carbon electrode materials for supercapacitors and its preparation, can solve the problems of poor activation effect of activators, small specific surface area of ​​activated carbon materials, difficulty in adjusting the pore structure and specific surface area of ​​activated carbon, and achieve broaden The effect of added value in the industrial chain, high medicinal value, and excellent pore structure

Active Publication Date: 2019-11-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the biomass used in the above-mentioned prior art is used as the precursor for preparing supercapacitor electrode materials, and the activation effect of the activator is poor, the specific surface area of ​​the prepared activated carbon material is small, and it is difficult to carry out the pore structure and specific surface area of ​​the activated carbon. Therefore, it is necessary to develop a new supercapacitor porous carbon electrode material and its preparation method

Method used

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  • Method for preparing porous carbon from scallions and waste
  • Method for preparing porous carbon from scallions and waste
  • Method for preparing porous carbon from scallions and waste

Examples

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Comparison scheme
Effect test

Embodiment 1

[0067] A method for preparing porous carbon from scallions and wastes thereof, comprising the steps of:

[0068] Step 1: chop and wash the green onions, place them in an ethanol solution with a mass concentration of 80% according to the ratio of material to liquid 1g: 10ml, heat in a water bath at 80°C for 8 hours, dry and pulverize;

[0069] In step 2, the sample powder obtained in step 1 was placed in a tubular resistance furnace, heated to 600 °C in a nitrogen atmosphere (flow rate: 1.5 L / min), the heating rate was 5 °C / min, kept for 2 hours, cooled to room temperature, and prepared Onion carbonized material;

[0070] Step 3: pickling the green onion carbonized material obtained in Step 2 with 3M hydrochloric acid solution at 80°C, then washing with 80°C deionized water until neutral, and drying for later use;

[0071] Step 4, weigh 4g of the product obtained in step 3, weigh 16g of KOH solid according to the carbon-to-alkaline ratio of 1:4 and configure it into a saturate...

Embodiment 2

[0075] A method for preparing porous carbon from scallions and their wastes is the same as in Example 1, except that the carbon-to-alkali ratio is 1:3.

Embodiment 3

[0077] A method for preparing porous carbon from scallions and their wastes is the same as in Example 1, except that in step 1, only the scallions need to be washed, dried and crushed, and no water-bath heating pretreatment is required.

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Abstract

The invention relates to a method for preparing porous carbon from a green Chinese onion and a waste, and relates to the technical field of preparation of the porous carbon. The method comprises the following steps: (1) drying and pulverizing the raw material of the green Chinese onion, putting in a heating furnace, introducing a protective gas, heating and carbonizing; (2) pickling a produced obtained in the step (1), then washing to neutral, and drying; (3) mixing and soaking a produced obtained in the step (2) with an activating agent, heating and activating under the protective atmospherein the heating furnace; (4) pickling and drying a product obtained in the step (3), to obtain the green Chinese onion based porous carbon. The green Chinese onion and the waste of the green Chinese onion are taken as the raw materials, the prepared porous carbon is low in ash content and good in wettability, an assembled double-electrode system double-electric-layer supercapacitor has the advantages of high specific capacitance, low equivalent series resistance, high charge-discharge efficiency, and low time constant, and particularly has an excellent high-current charge-discharge capacity andenergy density when charging and discharging at high rate.

Description

technical field [0001] The invention relates to the technical field of preparation of porous carbon, in particular to a supercapacitor porous carbon electrode material and a preparation method thereof. Background technique [0002] As a new type of energy storage device between traditional capacitors and rechargeable batteries, supercapacitors have the advantages of high energy density, high power density, long cycle life, fast charge and discharge speed, large temperature window and excellent rate performance. Information technology, electric vehicles, aerospace and defense technology and other fields have extremely important and broad application prospects. [0003] At present, supercapacitor electrode materials mainly include the following categories: transition metal oxides, conductive polymers, and carbon-based materials. Among the electrode materials for supercapacitors, various carbon materials, such as activated carbon, carbon nanotubes, graphene, and carbon aerogel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318C01B32/324C01B32/348H01G11/26H01G11/34H01G11/86
CPCC01B32/318C01B32/324C01B32/348C01P2002/80C01P2004/03C01P2006/12C01P2006/14C01P2006/17C01P2006/40H01G11/26H01G11/34H01G11/86Y02E60/13
Inventor 韩奎华高扬李金晓牛胜利赵建立李明
Owner SHANDONG UNIV
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