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Method for preparing super capacitor carbon electrode material by using pistachio nut shell as raw materials

A technology of supercapacitors and pistachio shells, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of no discovery, achieve large micropore specific surface area, good application prospects, and reduce costs

Inactive Publication Date: 2014-08-06
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after searching, there is no precedent for using pistachio shells as carbon electrode materials for supercapacitors.

Method used

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  • Method for preparing super capacitor carbon electrode material by using pistachio nut shell as raw materials
  • Method for preparing super capacitor carbon electrode material by using pistachio nut shell as raw materials
  • Method for preparing super capacitor carbon electrode material by using pistachio nut shell as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix 10 g dried and crushed pistachio shells, 1 g KOH, and 10 mL water evenly, place in a tube furnace, and then 2 Under protection, the temperature was raised to 600°C for carbonization for 4 hours. Subsequently, the obtained carbonized product is washed once with dilute hydrochloric acid, then washed with distilled water until neutral, and finally dried to obtain a carbon electrode material. N 2 Adsorption / desorption tests found that the product had a specific surface area of ​​300 m 2 / g, total pore volume 0.3 cm 3 / g. When the discharge current was 0.1 A / g, the specific capacitance value of the obtained carbon electrode material was 120 F / g in KOH electrolyte and 20 F / g in organic electrolyte.

Embodiment 2

[0023] Mix 10 g dried and crushed pistachio shells, 3 g KOH, and 10 mL water evenly, place in a tube furnace, and then 2 Under protection, the temperature was raised to 700°C for carbonization for 4 hours. Subsequently, the obtained carbonized product is washed once with dilute hydrochloric acid, then washed with distilled water until neutral, and finally dried to obtain a carbon electrode material. N 2 Adsorption / desorption tests found that the product had a specific surface area of ​​1000 m 2 / g, total pore volume 1.1 cm 3 / g. When the discharge current was 0.1 A / g, the specific capacitance value of the obtained carbon electrode material was 200 F / g in KOH electrolyte and 80 F / g in organic electrolyte.

Embodiment 3

[0025] Mix 10 g dried and crushed pistachio shells, 3 g NaOH, and 10 mL water evenly, place in a tube furnace, and then 2 Under protection, the temperature was raised to 600°C for carbonization for 4 hours. Subsequently, the obtained carbonized product is washed once with dilute hydrochloric acid, then washed with distilled water until neutral, and finally dried to obtain a carbon electrode material. N 2 Adsorption / desorption tests found that the product had a specific surface area of ​​700 m 2 / g, total pore volume 0.8 cm 3 / g. When the discharge current was 0.1 A / g, the specific capacitance of the obtained carbon electrode material was 180 F / g in KOH electrolyte and 53 F / g in organic electrolyte.

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Abstract

The invention provides a method for preparing a super capacitor carbon electrode material by using pistachio nut shells as raw materials. The method comprises the steps that after the dried pistachio nut shells are smashed, low-dose NaOH or KOH serves as an activating agent, temperature is made to rise to 600-700 DEG C under the protection of N2, then the pistachio nut shells are washed to be neutral sequentially through diluted hydrochloric acid and water, and finally the pistachio-nut-shell-based carbon electrode material is obtained after drying is conducted. In the method, the raw materials of the pistachio nut shells can be regenerated, the raw materials are rich in source, the cost is low, the activating technology is simple, therefore, the high additional value of the pistachio nut shells is utilized and the cost of the super capacitor carbon electrode material is effectively lowered. The prepared carbon electrode material has excellent super capacitor properties, the specific capacitance value of the prepared carbon electrode material in a KOH electrolyte can reach as high as 300 F / g and the specific capacitance value of the prepared carbon electrode material in an organic electrolyte can reach 125 F / g.

Description

technical field [0001] The invention relates to a method for preparing a supercapacitor carbon electrode material, in particular to a method for preparing a supercapacitor carbon electrode material by using pistachio nut shells as a raw material. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional electrostatic capacitors and secondary batteries. It has the characteristics of fast charging and discharging, long cycle life, high power density and wide operating temperature range. It can be widely used in national defense, railway , electric vehicles, electronics, communications, aerospace and other fields. Electrode materials are the most important components of supercapacitors. Carbon electrode materials have the advantages of stable physical and chemical properties, good electrical conductivity, and long cycle life. They are the most researched and promising electrode materials in this field. Pore ​​size and distribution...

Claims

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Application Information

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IPC IPC(8): H01G11/34
CPCY02E60/13
Inventor 周晋周通田爽
Owner SHANDONG UNIV OF TECH
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