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Method for preparing nitrogen-doped porous carbon material for supercapacitor

A technology for nitrogen-doped porous carbon and porous carbon materials, which can be applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., and can solve the problems of complex synthesis steps of nitrogen-doped porous carbon.

Inactive Publication Date: 2017-03-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis steps of nitrogen-doped porous carbon are complicated, so how to realize the synchronous completion of nitrogen doping and activation process by using cheap biomass as raw material is the key to the preparation of high-performance porous carbon materials for supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Mix the crushed peanut shells, KOH, and urea in a mass ratio of 1:5:3 (g / g / g), add 50 mL of distilled water and mix them evenly, soak the mixture for 10 hours and dry it in an oven at 90°C For 12h, the dried mixture was activated in a tube furnace at 800°C for 1h, the solid was washed and dried, and the obtained nitrogen-doped porous carbon material was tested for electrochemical performance. Within the voltage range of ~1.0v, the measured specific capacity is 294F / g, and the capacity retention rate is about 96% after 5000 cycles.

Embodiment 2

[0011] Embodiment 2: changing the mass ratio of peanut shell, activating reagent, urea is 1: 4: 3 (g / g / g), other conditions are the same as embodiment 1, and the specific capacitance of the nitrogen-doped porous carbon material obtained is 271F / g, the capacity retention rate is about 96% after 5000 cycles.

Embodiment 3

[0012] Embodiment 3: change the mass ratio of peanut shell, activation reagent, urea to be 1: 5: 2 (g / g / g), other conditions are the same as embodiment 1, and the specific capacitance of the nitrogen-doped porous carbon material obtained is 280F / g, the capacity retention rate is about 96% after 5000 cycles.

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Abstract

The invention discloses a method for one-step activation synthesis of a nitrogen-doped porous carbon material for a high-performance supercapacitor from biomass such as peanut shells as raw materials, a nitrogen source and an activation reagent. The method comprises crushing biomass such as peanut shells, mixing the crushed peanut shells, the activation reagent and the nitrogen source according to a ratio, adding a certain amount of distilled water into the mixture, carrying out immersion for a period of time, drying the mixture for a certain time, activating the mixture in a tubular furnace at a high temperature for a period of time, filtering the solids, and washing and drying the solids to obtain a high performance nitrogen-doped hierarchical pore carbon material for a supercapacitor. The synthesis route of the method is simple. Through control of use amounts of the activation reagent and nitrogen source, a nitrogen doping amount and a pore development degree of the porous carbon material are controlled so that the nitrogen-doped porous carbon material for a high specific capacity supercapacitor is prepared.

Description

technical field [0001] The invention relates to a method for preparing a biomass-based nitrogen-doped porous carbon material, in particular to a method for preparing nitrogen-doped porous carbon for high-performance supercapacitors by mixing biomass, an activating reagent and a nitrogen source, and then activating it at high temperature. A new approach to materials. Background technique [0002] Porous carbon has high application value in the field of supercapacitors due to its good chemical stability, electrical conductivity, biocompatibility, large specific surface area and low price. According to the different ways of storing energy, supercapacitors are divided into two categories, one is electrochemical double-layer capacitors (EDLC), and the other is Faraday capacitors, also known as redox capacitors. In double-layer capacitors, carbon materials perform energy storage through high-speed redox reactions and adsorption of ions. EDLC is a new type of energy storage devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01P2006/40
Inventor 王丽丽吴晓芬李艳婷逯文启
Owner TIANJIN POLYTECHNIC UNIV
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