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Porous biomass carbon electrode material derived from wheat straws and preparation method thereof

A technology of biomass charcoal and wheat straw, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of waste of resources, human health threats, toxic and harmful substances in straw haze, etc., and reduce environmental pollution. Effect

Active Publication Date: 2018-12-14
ANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most wheat stalks are burned, which not only wastes resources, but also creates smog and produces a large amount of toxic and harmful substances, which poses a threat to human health.

Method used

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  • Porous biomass carbon electrode material derived from wheat straws and preparation method thereof
  • Porous biomass carbon electrode material derived from wheat straws and preparation method thereof
  • Porous biomass carbon electrode material derived from wheat straws and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] ① The raw material wheat straw is cleaned, dried and crushed into powder, and sieved with a 200-mesh sieve. Then mix 10g of citric acid and 10g of wheat straw powder, add 100mL of ionized water, and ultrasonicate for 30 minutes to completely dissolve the citric acid, then add 2.5g of NaH 2 PO 4 , magnetically stirred until a straw slurry was formed.

[0025] ② Freeze the obtained straw slurry and dry it with a freeze dryer, then carbonize it in a high-temperature tube furnace in a flowing Ar atmosphere, raise the temperature to 800°C and keep it warm for 2 hours, and wash the calcined product with dilute hydrochloric acid and deionized water until the pH is equal to 7 , to obtain biochar material after drying.

[0026] ③ Mix 0.5 g of the biochar material prepared in step (2) with 1.5 g of KOH, ultrasonically mix in 10 mL of water for 30 minutes, and dry the resulting mixture at 60° C. The dried mixed samples were heated to 800 °C in an Ar atmosphere and kept for 2 h....

Embodiment 2

[0030] ① The raw material wheat straw is cleaned, dried and crushed into powder, and sieved with a 200-mesh sieve. Then mix 8g of citric acid and 8g of wheat straw powder, add 50mL of ionized water, and ultrasonicate for 30 minutes to completely dissolve the citric acid, then add 2g of NaH 2 PO 4 , magnetically stirred until a straw slurry was formed.

[0031] ② Freeze the obtained straw slurry and dry it with a freeze dryer, then carbonize it in a high-temperature tube furnace in a flowing Ar atmosphere, raise the temperature to 800°C and keep it warm for 2 hours, and wash the calcined product with dilute hydrochloric acid and deionized water until the pH is equal to 7 , to obtain biochar material after drying.

[0032] ③ Mix 0.5 g of the biochar material prepared in step (2) with 2.5 g of KOH, ultrasonically mix in 10 mL of water for 30 minutes, and dry the resulting mixture at 60° C. The dried mixed samples were heated to 800 °C in an Ar atmosphere and kept for 2 h. Fin...

Embodiment 3

[0035] ① The raw material wheat straw is cleaned, dried and crushed into powder, and sieved with a 200-mesh sieve. Then mix 16g of citric acid and 16g of wheat straw powder, add 200mL of ionized water, and ultrasonicate for 30 minutes to completely dissolve the citric acid, then add 4g of NaH 2 PO 4 , magnetically stirred until a straw slurry was formed.

[0036] ② Freeze the obtained straw slurry and dry it with a freeze dryer, then carbonize it in a high-temperature tube furnace in a flowing Ar atmosphere, raise the temperature to 800°C and keep it warm for 2 hours, and wash the calcined product with dilute hydrochloric acid and deionized water until the pH is equal to 7 , to obtain biochar material after drying.

[0037] ③ Mix 0.5 g of the biochar material prepared in step (2) with 3.5 g of NaOH, ultrasonically mix in 10 mL of water for 30 minutes, and dry the resulting mixture at 60° C. The dried mixed samples were heated to 800 °C in an Ar atmosphere and kept for 2 h. ...

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Abstract

The invention discloses a porous biomass carbon electrode material derived from wheat straws and a preparation method thereof, belonging to the technical field of electrode material preparation. The method for preparing the wheat straw comprises mixing wheat straw, citric acid and NaH2PO4 according to a certain mass ratio, and stirring the mixture to form a slurry. The slurry is then lyophilized and carbonized. The porous biomass carbon electrode material suitable for supercapacitor can be obtained by mixing carbonized product and KOH according to a certain mass ratio and activating at high temperature. The obtained electrode materials have excellent electrochemical properties at 1.0 Ag<-1>, the specific capacitance can reach 294 Fg<-1>, even at current densities up to 15 Ag<-1>, the specific capacitance can still reach 200 Fg<-1>. Effective utilization of biological waste resources is effectively realized, not only is new value created, but also environmental pollution are effectivelyreduced.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode material preparation, and in particular relates to a porous biomass carbon electrode material derived from wheat straw and a preparation method thereof. Background technique [0002] Due to the limited supply of fossil fuels and the rapid consumption of energy, the demand and challenges for energy storage are increasing. Therefore, there is an urgent need to develop high-performance energy storage and energy conversion devices. As a high-efficiency electrochemical storage system, supercapacitors have the advantages of high power density, fast charge and discharge, and long shelf life. They stand out among many energy storage systems, making them widely used in subway systems, electric vehicles, Road lighting and smart grids. According to the storage mechanism, supercapacitors can be divided into pseudocapacitors and electric double layer capacitors. The materials of pseudocapaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/86
CPCH01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 杜卫民张紫瑞杜兰歌曹智魏成振魏少红
Owner ANYANG NORMAL UNIV
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