Preparation method for nitrogen-doped graphene
A nitrogen-doped graphene and montmorillonite technology is applied in the preparation of nitrogen-doped graphene for supercapacitors and the field of graphene preparation. problems, to achieve the effect of increasing electrochemical active sites, increasing effective specific surface area, and simple preparation process
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Embodiment 1
[0028] Such as figure 1 As shown, first, 200 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 1 nm is uniformly dispersed in water to form a suspension with a mass fraction of 0.5 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its The pH value is 1-5. Then, 100 mg of dopamine was added as a carbon source so that the mass ratio to montmorillonite m 碳源 / m 蒙脱石 =1:2. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce the polymerization of dopamine, and the polymerization time was 24 hours. The resulting polymer precipitate was filtered, washed and dried, calcined and carbonized in a tube furnace, and heated to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and kept for 2 h. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obt...
Embodiment 2
[0033] First, 200 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 3 nm is evenly dispersed in water to form a suspension with a mass fraction of 1 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its pH to 1 -5. Then, add 100 mg of pyrrole as a carbon source so that the mass ratio of montmorillonite to m 碳源 / m 蒙脱石 =1:2. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce polymerization of pyrrole, and the polymerization time was 24 hours. The resulting polymerized precipitate was suction filtered, washed and dried, calcined and carbonized in a tube furnace, and raised to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and kept for 2h. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obtain high-quality nitrogen-doped graphene...
Embodiment 3
[0035] First, 100 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 2 nm is evenly dispersed in water to form a suspension with a mass fraction of 1 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its pH to 1 -5. Then, 100 mg of dopamine was added as a carbon source so that its mass ratio to montmorillonite m 碳源 / m 蒙脱石 =1:1. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce the polymerization of dopamine, and the polymerization time was 24 hours. The resulting polymer precipitate was suction filtered, washed and dried, calcined and carbonized in a tube furnace, and kept at 900°C for 2 h at a rate of 3°C / min under a nitrogen atmosphere. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obtain high-quality nitrogen-doped graphene.
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