A kind of preparation method of nitrogen-doped graphene and manganese dioxide composite electrode material
A technology of nitrogen-doped graphene and manganese dioxide, which is applied in the field of nanomaterials, can solve the problems of harsh conditions and no reports on composite electrode materials of manganese dioxide and nitrogen-doped graphene, and achieve low cost and increase charge storage capacity and service life, and the effect of rich sources of raw materials
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Embodiment 1
[0030] First, weigh 90 mg of graphene oxide, disperse it into 80 mL of ultrapure water, and dissolve it fully by ultrasonic and stirring, then add 112 mg of potassium hydroxide, 316 mg of potassium permanganate and 1 g of urea in sequence, and stir for 15 min respectively; The solution was transferred into a 100mL polytetrafluoroethylene-lined stainless steel reactor and reacted at 120°C for 12h. The obtained product was centrifuged and washed with ultrapure water and ethanol, and then dried at 60° C. for 12 hours to obtain a composite material of nitrogen-doped graphene and manganese dioxide.
[0031] The X-ray diffraction pattern of the obtained nitrogen-doped graphene and manganese dioxide composite material is as follows figure 1 shown by figure 1 It can be seen that the prepared manganese dioxide is α-MnO 2 , and the diffraction peaks of graphene can be clearly seen. figure 2 a is the transmission electron microscope image of the prepared nitrogen-doped graphene and m...
Embodiment 2
[0033] Graphene oxide, potassium permanganate and urea were sequentially dispersed into 80 mL of ultrapure water at a mass ratio of 10:12:78. After it was fully dissolved by ultrasonication and stirring, the resulting solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel reactor and reacted at 80 °C for 3 h. The obtained product was centrifuged and washed with ultrapure water and ethanol, and then dried at 60° C. for 12 hours to obtain a composite material of nitrogen-doped graphene and manganese dioxide.
[0034] figure 2b is the transmission electron microscope image of the composite material obtained by figure 2 b shows that manganese dioxide is needle-shaped.
Embodiment 3
[0036] Graphene oxide, potassium permanganate and aniline were sequentially dispersed into 80 mL of ultrapure water at a mass ratio of 3:13:84. After it was fully dissolved by ultrasonication and stirring, the resulting solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel reactor and reacted at 120 °C for 3 h. After the obtained product was centrifugally washed with ultrapure water and ethanol, it was dried at 60°C for 12h, and the obtained product was calcined at 400°C for 12h to obtain a nitrogen-doped graphene and manganese dioxide composite material, and the manganese dioxide was a tetragonal ( figure 2 c).
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