carbon-nitrogen co-doped co 3 o 4 Composite material and its preparation method and use
A composite material and co-doping technology, which is applied in the field of carbon-nitrogen co-doped Co3O4 composite material and its preparation, can solve problems such as poor cycle stability, improve electrical conductivity, such as capacity value and capacity retention rate, and ensure stability. sexual effect
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Embodiment 1
[0033] A carbon-nitrogen co-doped Co 3 o 4 A method for preparing a composite material, comprising:
[0034] (1) Pour 0.3mol / L glucose solution into a stainless steel autoclave lined with polytetrafluoroethylene, keep it warm at 190°C for 15h, and then add glucose and CoSO with a mass ratio of 4:2 4 ·7H 2 O, heat preservation at 160°C for 26h by hydrothermal method;
[0035] (2) centrifuging the product obtained in step (1), cleaning it with water and ethanol successively, and drying it at 70° C. for 7 hours;
[0036] (3) Place the product obtained in step (2) in an air atmosphere and heat it with a tube furnace at a heating rate of 1°C / min, heat it to 580°C and keep it warm for 2h to obtain an average particle size of 100 (±15) nm Co 3o 4 hollow ball;
[0037] (4) Co prepared in step (3) with a mass ratio of 1:1.5 3 o 4 and 5mg / mL dopamine hydrochloride (Shenzhen Puruikang Biotechnology Co., Ltd.) were dissolved in concentrated hydrochloric acid with a concentration ...
Embodiment 2
[0040] A carbon-nitrogen co-doped Co 3 o 4 The preparation method of composite material is basically the same as the preparation method of embodiment, difference is:
[0041] In step (1), the concentration of glucose solution is 0.8mol / L, and it is incubated at 160°C in a stainless steel autoclave for 18h; glucose and CoSO 4 ·7H 2 The mass ratio of O is 2:2, and the hydrothermal method is kept at 190°C for 20h;
[0042] In step (2), the drying temperature is 90° C., and the drying time is 4 hours;
[0043] In step (3), the heating rate is 3°C / min, heated to 500°C, and the holding time is 5h;
[0044] In step (4), the concentration of dopamine hydrochloride is 0.5mg / mL, Co 3 o 4 The mass ratio of hollow spheres and dopamine hydrochloride is 1:2.5, the concentration of concentrated hydrochloric acid is 11mol / L, let stand for 3h;
[0045] In step (5), in NH 3 Heating to 850°C under atmosphere, holding time is 1h, drying temperature is 70°C.
Embodiment 3
[0047] A carbon-nitrogen co-doped Co 3 o 4 The preparation method of composite material is basically the same as the preparation method of embodiment, difference is:
[0048] In step (1), the concentration of glucose solution is 0.5mol / L, and it is incubated at 180°C for 16h in a stainless steel autoclave; glucose and CoSO 4 ·7H 2 The mass ratio of O is 3:2, and the hydrothermal method is kept at 170°C for 23h;
[0049] In step (2), the drying temperature is 80° C., and the drying time is 5 hours;
[0050] In step (3), the heating rate is 2°C / min, heated to 540°C, and the holding time is 4h;
[0051] In step (4), the concentration of dopamine hydrochloride is 3mg / mL, Co 3 o 4 The mass ratio of hollow spheres and dopamine hydrochloride is 1:2, the concentration of concentrated hydrochloric acid is 10mol / L, let stand for 4h;
[0052] In step (5), in NH 3 Heating to 800°C under atmosphere, the holding time is 2h, and the drying temperature is 60°C.
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