A nitrogen-doped porous carbon material with hierarchical pore structure and its preparation method and application
A nitrogen-doped porous carbon and hierarchical pore technology is applied in the fields of nano-carbon, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc. and other problems, to achieve the effect of simple method, low process cost and excellent performance
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Embodiment 1
[0039] Dissolve 1mol of magnesium nitrate and 2mol of urea in deionized water, then put 100g of absorbent cotton cellulose raw material into the solution, fully impregnate it, and dry it at 60°C; then, heat it to 500°C under a nitrogen atmosphere and keep it Pre-calcined for 10 minutes; the pre-calcined powder was ground, heated to 900°C under nitrogen atmosphere and kept for 2 hours for calcination; after that, it was soaked and washed in 0.5mol / L hydrochloric acid aqueous solution, filtered, and washed with water to neutral pH properties, drying, and finally a porous carbon material.
[0040] figure 1 It is the TG-DSC diagram of the pyrolysis of cellulose raw materials, which shows an endothermic reaction between 300-400°C.
[0041] figure 2 It is a TG-DSC chart of the pyrolysis of the cellulose raw material impregnated with magnesium nitrate and urea, and a rapid exothermic reaction occurs around 200°C. Due to the high-efficiency exothermic reaction, the cellulose raw m...
Embodiment 2
[0048] Dissolve 1 mol of potassium nitrate and 2 mol of urea in deionized water, then put 100 g of absorbent cotton cellulose raw material into the solution, fully impregnate it, and dry it at 60°C; then, heat it to 500°C under an argon atmosphere and Keep it for 10 minutes for pre-calcination; after the pre-calcined powder is ground, heat it to 900°C in an argon atmosphere and keep it for 2 hours for calcination; after that, soak and wash in 0.5mol / L sulfuric acid aqueous solution, filter, and wash with water pH To neutral, dry, and finally get a porous carbon material.
[0049] Figure 7 It is the nitrogen adsorption-desorption curve figure of the nitrogen-doped porous carbon material that the present embodiment makes, and wherein abscissa is relative pressure P / Po, and ordinate is pore volume, and the unit is (cm 3 / g), it can be seen from the figure that the adsorption of the curve near relative pressure is 0, indicating that the prepared nitrogen-doped carbon material ha...
Embodiment 3
[0052] Dissolve 0.8 mol of magnesium nitrate, 0.4 mol of potassium nitrate and 2 mol of urea in deionized water, then put 100 g of absorbent cotton cellulose raw material into the solution, fully impregnate it, and dry it at 60°C; then, in argon Heating to 500°C under the atmosphere and keeping it for 10 minutes for pre-calcination; after grinding the pre-fired powder, heating to 900°C under an argon atmosphere and keeping it for 2 hours for calcination; after that, soaking in 0.5mol / L nitric acid aqueous solution washing, filtering, washing with water to neutral pH, and drying to finally obtain a porous carbon material.
[0053] Figure 8 It is the nitrogen adsorption-desorption curve figure of the nitrogen-doped porous carbon material that the present embodiment makes, and wherein abscissa is relative pressure P / Po, and ordinate is that ordinate is pore volume, and the unit is (cm 3 / g), it can be seen from the figure that the adsorption of the curve near relative pressure ...
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