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Green cycle process for preparing activated carbon material for supercapacitors by using rice husks

A technology of supercapacitor and activated carbon, which is applied in the field of green recycling process, can solve the problems of high water consumption, large discharge of waste liquid, activated carbon cannot be used for supercapacitors, etc., and achieves the effect of reducing production cost and solving the problem of waste water pollution.

Active Publication Date: 2014-11-19
旗禾科技(吉林)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents only focus on the comprehensive utilization of rice husk components, and the prepared activated carbon cannot be used in supercapacitors, and the problems of high water consumption and large waste liquid discharge have not been solved.

Method used

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  • Green cycle process for preparing activated carbon material for supercapacitors by using rice husks

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Rice husk is cleaned, dried and ground;

[0025] (2) Carbonizing the ground rice husks in the above step (1) under nitrogen protection at 450° C. for 2 hours to obtain carbonized rice husks;

[0026] (3) Mix the carbonized product obtained in the above step (2) with KOH at a mass ratio of 1:3, add a certain amount of water and mix evenly, dry, control the heating rate of 10°C / min, and activate at 750°C for 1h;

[0027] (4) Soak the activated product in water at 90°C, filter, wash with boiling water until neutral, and dry at 100°C for 12 hours to obtain a rice husk-based activated carbon material with a specific surface area of ​​3235cm2 / g and an average pore size of 2.0nm. The specific capacitance in 6M KOH solution is 331F / g. After 2000 cycles of charging and discharging at a current density of 1A / g, the specific capacitance retention rate is 93.5%. When the current density increases from 1A / g to 10A / g, the capacitance The retention rate is 67.2%;

[0028] (5) Re...

Embodiment 2

[0036] (1) Rice husk is cleaned, dried and ground;

[0037] (2) carbonizing the ground rice husks in the above step (1) under argon protection at 450°C for 2 hours to obtain carbonized rice husks;

[0038] (3) Mix the carbonized product obtained in the above step (2) with NaOH at a mass ratio of 1:4, add a certain amount of water to mix evenly, dry, control the heating rate of 10°C / min, and activate at 800°C for 2h;

[0039] (4) Soak the activated product in water at 90-100°C, filter, wash with boiling water to neutrality, and dry at 120°C for 12 hours to obtain a rice husk-based activated carbon material with a specific surface area of ​​2753cm2 / g and an average pore size of 2.3nm. Rice husk charcoal at 1M H 2 SO 4 The specific capacitance measured in the material is 305F / g, and the specific capacitance retention rate is 96.8% after 10,000 cycles of charging and discharging at a current density of 1A / g. When the current density increases from 1A / g to 10A / g, the capacitance ...

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Abstract

The invention discloses a green cycle process for preparing an activated carbon material for supercapacitors by using rice husks, and belongs to the technical field of comprehensive utilization of resources and electrochemical supercapacitors. The method comprises the following steps: carbonizing rice husks under the protection of inert gas so as to obtain a carbonized product, adding alkali into the carbonized product, and sequentially activating, washing, filtrating and drying so as to obtain high-specific-capacitance rice husk charcoal; adding hydrochloric acid into filtrate for acidifying, and sequentially aging, filtrating, washing and drying so as to obtain nano-silica; carrying out impurity removal, concentration, primary refining, secondary refining and electrolysis on the filtrate so as to obtain dilute alkali liquor, evaporating and crystallizing the dilute alkali liquor so as to obtain alkali, taking the obtained alkali as an activator used in the activation process, and taking water obtained in the process of evaporation as water for washing, so that the cyclic utilization of alkali and water is realized. According to the invention, capacitance charcoal capable of being used for the supercapacitors is prepared by using cheap rice husks; silicon-containing waste liquid can be converted into nano-silica, so that the green conversion of high-value-added rice husks is realized, therefore, the green cycle process has a high economic benefit.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources and electrochemical supercapacitors, and in particular relates to a green recycling process for preparing activated carbon materials for supercapacitors from rice husks. Background technique. [0002] As a new type of energy storage device, supercapacitors have attracted extensive attention because of their high power density, high charge-discharge efficiency, and long cycle life. Electrode material is an important factor in determining the performance of supercapacitors. Activated carbon has become the most commercially competitive supercapacitor electrode material due to its favorable electrical properties, abundant resources, diverse structures, and affordable price. Activated carbon is generally prepared from carbon-containing precursors through high-temperature carbonization and activation. The carbonization process is essentially the enrichment process of car...

Claims

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Application Information

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IPC IPC(8): C01B31/12C01B33/12
Inventor 林海波刘德臣李阳陆海彦张文礼
Owner 旗禾科技(吉林)有限责任公司
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