Nitrogen-oxygen-sulfur triple-doped porous carbon material and preparation method thereof

A porous carbon material and three-doping technology, which is applied in chemical instruments and methods, carbon compounds, hybrid/electric double layer capacitor manufacturing, etc., can solve the problems of high production cost of electrode materials, insufficient specific capacitance and rate performance, etc. Achieve the effects of shortening ion diffusion distance, good rate performance, and promoting intercalation/extraction

Inactive Publication Date: 2019-01-29
OCEAN UNIV OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nitrogen, oxygen and sulfur triple-doped porous carbon material and its preparation method, which can be applied to supercapacitors. The biomass-derived carbon electrode material can solve the problem of insufficient specific capacitance and rate performance in the prior art. , can also realize the high value-added utilization of biomass, and at the same time solve the problem of high production cost of supercapacitor electrode materials

Method used

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  • Nitrogen-oxygen-sulfur triple-doped porous carbon material and preparation method thereof
  • Nitrogen-oxygen-sulfur triple-doped porous carbon material and preparation method thereof
  • Nitrogen-oxygen-sulfur triple-doped porous carbon material and preparation method thereof

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Embodiment 1

[0039] Example 1: We first washed the white fungus with distilled water and dried it. Combine dried white fungus with KNO 3 Weigh according to the mass ratio of 1:1, then KNO 3 Prepare a solution with 100 mL of distilled water, then put Tremella into it and mix, soak for 12 h, put it into a freeze dryer at -30°C for drying, and obtain dried Tremella-KNO after freeze-drying 3 Precursor mixture. After that, the mixture was placed in a tube furnace at 30 mL min -1 N 2 atmosphere with 3 o C min -1 The rate of heating up to 800 o C, and kept at this temperature for 1 h, after cooling down, the obtained product was washed with 2 M hydrochloric acid for 12 h, and then washed with distilled water for 5 times, and then the sample was placed in 80 o C dried in a vacuum oven for more than 12 h to obtain nitrogen, oxygen and sulfur triple-doped porous carbon materials. Mix the obtained carbon material with conductive carbon black (Super P) and binder (polyvinylidene fluoride) acco...

Embodiment 2

[0041] Embodiment 2: the method of this embodiment is basically the same as embodiment 1, the difference is: the carbonization activation temperature becomes 500 oC , the heating rate of the tube furnace was controlled at 0.1°C min -1 , N 2 Atmosphere flow rate is 10 mL min -1 , holding time is 10 h. The SEM picture of the electrode material is reflected in figure 2 middle. at 0 o C. 20 o C and 60 o C for supercapacitor electrodes at 100 mVs -1 The cyclic voltammetry curves at the scan rate are also reflected in Figure 6 , Figure 10 , Figure 14 middle. at 0 o C. 20 o C and 60 o C for supercapacitor electrodes at 10 A g -1 The constant current charge and discharge curve under the current density is also reflected in Figure 7 , Figure 11 , Figure 15 middle. at 0 o C. 20 o C and 60 o The change of the specific capacitance of the supercapacitor electrode under different current densities under C is also reflected in Figure 8 , Figure 12 , Figur...

Embodiment 3

[0042] Embodiment 3: the method of this embodiment is basically the same as embodiment 1, the difference is: the carbonization activation temperature becomes 900 oC , the heating rate of the tube furnace was controlled at 7°C min -1 , N 2 Atmosphere flow rate is 50 mL min -1 , holding time is 2 h. The SEM picture of the electrode material is reflected in image 3 in, at 0 o C. 20 o C and 60 o C for supercapacitor electrodes at 100 mV s -1 The cyclic voltammetry curves at the scan rate are also reflected in Figure 6 , Figure 10 , Figure 14 in, at 0 o C. 20 o C and 60 o C for supercapacitor electrodes at 10 A g -1 The constant current charge and discharge curve under the current density is also reflected in Figure 7 , Figure 11 , Figure 15 in, at 0 o C. 20 o C and 60 o The change of the specific capacitance of the supercapacitor electrode under different current densities under C is also reflected in Figure 8 , Figure 12 , Figure 16 in, at 0 o C....

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Abstract

The invention discloses a nitrogen-oxygen-sulfur triple-doped porous carbon material and a preparation method thereof, and belongs to the field of new energy materials. A fungus tremella is selected as a precursor, a nitrate is selected as an activating agent, the mass ratio of the tremella to the activating agent is controlled to be 1:0.1-1:5, and relevant treatment is carried out to obtain a tremella-activator mixture; the mixture is put into a tubular furnace, and carbonization activation is carried out under an inert atmosphere; full washing is further carried out in diluted hydrochloric acid and distilled water for removing impurities; and drying is carried out in a drying oven to obtain the nitrogen-oxygen-sulfur triple-doped porous carbon material. The preparation method provided bythe invention is simple and feasible, cost is low, and the obtained nitrogen-oxygen-sulfur triple-doped carbon material has a hierarchical and open pore structure, has a large specific surface area,can be applied to electrode materials of supercapacitors, and has high specific capacitance, good rate performance and high energy density during a test at 0-60 DEG C.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a porous carbon material with high specific surface and rich nitrogen, oxygen and sulfur doped with three elements and a preparation method thereof, which can be applied to supercapacitors. Background technique [0002] The depletion of fossil energy and climate warming are common challenges faced by mankind. At present, the global energy demand is developing in the direction of cleanliness, diversification, renewable and high efficiency. Therefore, the development and utilization of renewable energy is the key to solving this problem. Among the existing forms of energy storage, supercapacitors and lithium-ion batteries have attracted great attention. However, supercapacitors still have a lower energy density than Li-ion batteries. To improve the energy density of supercapacitors, carbon materials are usually used as electrode materials due to their easy availab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/348H01G11/24H01G11/38H01G11/44H01G11/86
CPCC01B32/318C01B32/348H01G11/24H01G11/38H01G11/44H01G11/86Y02E60/13
Inventor 王焕磊张浩阚景林
Owner OCEAN UNIV OF CHINA
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