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A kind of nitrogen and phosphorus co-doped porous biomass carbon material and its preparation method and application in supercapacitor

A technology of biomass carbon and co-doping, which is applied in the direction of carbon preparation/purification, hybrid capacitor electrodes, etc., and can solve problems such as complicated steps, complicated process, and destruction of pore distribution advantages

Active Publication Date: 2020-10-27
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been some studies on the preparation of dual-element doped carbon materials using biomass materials as precursors. In the Chinese patent (CN106881138A), biomass chitosan is used as carbon and nitrogen sources (also as nitrogen-containing ligands), Using the organophosphorus compound triphenylphosphine as the phosphorus-containing ligand, this method needs to be coordinated by a metal salt solution first, and then zinc chloride is used as an activator to obtain a nitrogen-phosphorus co-doped biomass carbon material. The process requires further steps. The introduction of activators, the steps are more complicated
In addition, the Chinese patent (CN107601502A) discloses double doping by introducing non-metallic elements separately. The second doping process often causes further changes in the elements doped in the first step. For the doping amount Can not be well regulated; Chinese patent (CN107394217A) discloses carbonization of biomass raw materials first, further reactivation and doping, the process is relatively complicated, and some pore distribution advantages of biomass itself may destroy

Method used

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  • A kind of nitrogen and phosphorus co-doped porous biomass carbon material and its preparation method and application in supercapacitor
  • A kind of nitrogen and phosphorus co-doped porous biomass carbon material and its preparation method and application in supercapacitor
  • A kind of nitrogen and phosphorus co-doped porous biomass carbon material and its preparation method and application in supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of the nitrogen and phosphorus co-doped porous biomass carbon material of the present embodiment:

[0030] Mix and grind 2 g of air-dried and ground oyster mushroom powder with 6 g of ammonium dihydrogen phosphate, then transfer it to a small porcelain boat, put it into a tube furnace, and raise the temperature to 500 °C at 5 °C / min under the protection of a nitrogen atmosphere. 2h, naturally cooled to room temperature, then soaked and washed the material with 0.2mol / L hydrochloric acid solution, then washed with deionized water until neutral (pH=7), and finally dried at 80°C for 12h to prepare nitrogen and phosphorus co-doped porous biomass carbon material with a yield of about 40.3%. From figure 1 It can be seen that the obtained carbon material has an amorphous structure and no other impurities. figure 2 It can be seen from the SEM image (a) that it is a multi-level pore structure, which is determined by figure 2 (b) The specific surface a...

Embodiment 2

[0033] The preparation method of the nitrogen and phosphorus co-doped porous biomass carbon material of the present embodiment:

[0034]Mix and grind 1 g of air-dried and ground oyster mushroom powder with 2 g of ammonium dihydrogen phosphate, then transfer it to a small porcelain boat, put it into a tube furnace, and raise the temperature to 500 °C at 3 °C / min under the protection of nitrogen atmosphere. 3h, naturally cooled to room temperature, then soaked and washed the material with 0.2mol / L hydrochloric acid solution, then washed with deionized water until neutral (pH=7), and finally dried at 80°C for 12h to prepare nitrogen and phosphorus co-doped porous biomass carbon material with a yield of 44.2wt%. Depend on image 3 It can be explained that N and P are successfully doped into the carbon material, and the N content is 6.6wt% and the P content is 9.2wt% according to XPS analysis. In the same way, we changed the quality of ammonium dihydrogen phosphate, respectively ...

Embodiment 3

[0036] The preparation method of the porous biomass carbon material co-doped with nitrogen and phosphorus in this embodiment comprises the following steps:

[0037] Mix and grind 1 g of air-dried and ground Pleurotus ostreatus powder with 3 g of ammonium phosphate, then transfer it to a small porcelain boat, put it into a tube furnace, and raise the temperature to 650 °C at 3 °C / min under the protection of nitrogen atmosphere, and keep it for 3 hours. Naturally cool to room temperature, soak and wash the material with 0.2mol / L hydrochloric acid solution, wash with deionized water until neutral (pH=7), and finally dry at 80°C for 12 hours to prepare nitrogen-phosphorus co-doped porous Biomass carbon materials.

[0038] Further, the above obtained samples were subjected to electrochemical rate performance test. For comparison, the obtained samples were roasted without adding ammonium phosphate under the same conditions to obtain pure biomass carbon materials. Test method: Mix t...

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Abstract

The invention discloses a nitrogen and phosphorus codoped porous biomass carbon material and a preparation method and application thereof in a supercapacitor. The preparation method comprises the following steps: grinding and mixing an oyster mushroom raw material and nitrogen and phosphorus inorganic salt, and carrying out heat treatment under protection so as to obtain the double heteroatom elements-doped porous biomass carbon material with well-developed pore structure, good conductivity and many active sites. By using the porous biomass carbon material as an electrode material of a supercapacitor, a supercapacitor with high rate performance and specific capacity can be obtained. In addition, the preparation method of the biomass carbon material is simple and low-cost, and is beneficialto industrial application.

Description

technical field [0001] The present invention relates to a biomass carbon material, in particular to a nitrogen and phosphorus co-doped porous biomass carbon material and a method for preparing nitrogen and phosphorus co-doped porous biomass carbon material at a high temperature in one step, and also relates to a nitrogen and phosphorus co-doped porous biomass carbon material. The application of a material carbon material as a capacitor electrode material belongs to the technical field of capacitor electrode material preparation. Background technique [0002] Activated carbon materials are currently one of the most widely used materials in commercial capacitors. Biomass carbon materials have many advantages such as wide sources, low price, simple preparation, and environmental protection. Therefore, they are often used to develop electrode materials for electric double layer capacitors. . However, the low hydrophilicity of biomass carbon materials leads to an increase in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01G11/44
CPCC01P2002/72C01P2002/85C01P2004/03C01P2006/12C01P2006/40C01B32/05H01G11/44Y02E60/13
Inventor 景明俊吴天景要笑刚廖涛
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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