Method for preparing bismuth nanoparticles loaded on graphene fiber non-woven fabric by microwave induction

[0039] Step 1: Put a graphene oxide aqueous solution with a concentration of 3 mg / mL in a centrifuge tube, and the graphene oxide aqueous solution accounts for 1 / 3 of the volume of the centrifuge tube. Then add 1 / 5 of the centrifuge tube volume of N,N-dimethylformamide, after configuring the mass ratio of each centrifuge tube, put it into the centrifuge, the speed is 9000rpm, the time is 25min, and the graphene oxide at the bottom is retained after centrifugation , remove the supernatant. The above steps were repeated twice to finally obtain a DMF dispersion of 6mg / mL graphene oxide;

[0040] Step 2: put the original bismuth powder into a mortar and grind for 40 minutes to obtain bismuth particles with a particle size of 40-60 μm;

[0041] Step 3: Weigh 10 mg of bismuth powder and add it to 5 mL of the graphene oxide / N,N-dimethylformamide (GO / DMF) obtained in step 1, and stir for 3 h with a magnetic stirrer to finally obtain graphene oxide / N-dimethylformamide (GO /

[0046] The other steps of the preparation method of this embodiment are the same as those of Embodiment 1, the main difference lies in the length of microwave time. Finally, a graphene non-woven sodium ion energy storage material loaded with bismuth nanoparticles with different particle size distributions was obtained;

[0047] Step 1: Put a graphene oxide aqueous solution with a concentration of 3 mg / mL in a centrifuge tube, and the graphene oxide aqueous solution accounts for 1 / 3 of the volume of the centrifuge tube. Then add 1 / 5 of the centrifuge tube volume of N,N-dimethylformamide, after configuring the mass ratio of each centrifuge tube, put it into the centrifuge, the speed is 9000rpm, the time is 25min, and the graphene oxide at the bottom is retained after centrifugation , remove the supernatant. The above steps were repeated twice to finally obtain a DMF dispersion of 6mg / mL graphene oxide;

[0048] Step 2: put the original bismuth powder into a mortar and gri

[0054] Step 1: Put a graphene oxide aqueous solution with a concentration of 3 mg / mL in a centrifuge tube, and the graphene oxide aqueous solution accounts for 1 / 3 of the volume of the centrifuge tube. Then add 1 / 5 of the centrifuge tube volume of N,N-dimethylformamide, after configuring the mass ratio of each centrifuge tube, put it into the centrifuge, the speed is 9000rpm, the time is 25min, and the graphene oxide at the bottom is retained after centrifugation , remove the supernatant. The above steps were repeated twice to finally obtain a DMF dispersion of 6mg / mL graphene oxide;

[0055] Step 2: put the original bismuth powder into a mortar and grind for 40 minutes to obtain bismuth particles with a particle size of 40-60 μm;

[0056] Step 3: Weigh 10 mg of bismuth powder and add it to 5 mL of the graphene oxide / N,N-dimethylformamide (GO / DMF) obtained in step 1, and stir for 3 h with a magnetic stirrer to finally obtain graphene oxide / N-dimethylformamide (GO /