Hollow graphite carbon nanometer sphere in-situ modification amorphous carbon nanometer fibers or carbon nano-tubes and preparation method thereof
A nano-sphere, in-situ modification technology, applied in nano-carbon, fiber processing, nanotechnology and other directions, can solve the problems of rapid capacity decline and low stability, and achieve easy operation, good stability, and good ability to damage the structure. Effect
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[0027] The preparation method for in-situ modification of amorphous carbon nanofibers / carbon nanotubes provided by the present invention comprises the following steps:
[0028] (1) Preparation of electrospinning solution: use a polar solvent that can stir the transition metal salt and the cyclizable polymer resin into a homogeneous state under stirring conditions to mix and stir the transition metal salt and the cyclizable polymer resin to prepare Uniform electrospinning solution, wherein the weight percentages of the cyclizable polymer resin and the transition metal salt in the electrospinning solution are as follows: the cyclizable polymer resin accounts for the sum of the mass of the cyclizable polymer resin and the polar solvent 5-50%; the transition metal salt accounts for 1-50% of the mass of the cyclizable polymer resin solution. Wherein the cyclizable polymer resin solution is composed of a cyclizable polymer resin and a polar solvent. Therefore, the weight percentage...
example 1
[0042] 1. Preparation of electrospinning solution: with 7.5g polyvinyl alcohol (PVA), 4g nickel chloride (NiCl 2 ) and 67.5 mL of distilled water were mixed and stirred at 80° C. for a period of time to form a uniform spinning solution.
[0043] 2. Through the electrospinning equipment, at the voltage of 20kV, the distance between the spinneret and the receiving device is 18cm, and the feeding flow rate of the spinning solution is 0.4mL / h, the spinning solution is electrospun to prepare PVA / NiCl 2 Composite nanofiber precursors.
[0044] 3. The prepared PVA / NiCl 2 The composite nanofiber precursor was dried in a vacuum oven (vacuum degree 0.03MPa, temperature 70°C) for 8h.
[0045] 4. PVA / NiCl after drying 2 Composite nanofiber precursors in H 2 / N 2 Calcined at 500°C for 2h under an inert atmosphere. C / Ni composite nanofibers with diameters in the range of 50-100nm are prepared.
[0046] 5. C / Ni composite nanofibers were treated with nitric acid at a temperature of 30°...
example 2
[0049] 1. Preparation of electrospinning solution: with 2.5g PVA, 1.5g nickel acetate (Ni(Ac) 2 ) and 22.5 mL of distilled water were mixed and stirred at 80° C. for a period of time to form a uniform spinning solution.
[0050] 2. Prepare PVA / Ni(Ac) by electrospinning equipment at a voltage of 17kV, a distance between the spinneret and the receiving device of 18cm, a feeding flow rate of the spinning solution of 0.5mL / h, and electric discharge of the above spinning solution 2 Composite nanofiber precursors.
[0051] 3. The prepared PVA / Ni(Ac) 2 The composite nanofiber precursor was dried in a vacuum drying oven (vacuum degree: 0.02MPa, temperature: 70°C) for 8h.
[0052] 4. PVA / Ni(Ac) after drying 2 Composite nanofiber precursors in N 2 Calcined at 500°C for 2h under an inert atmosphere. C / Ni composite nanofibers with diameters in the range of 50-200nm are prepared.
[0053] 5. C / Ni composite nanofibers were treated with hydrochloric acid at a temperature of 25°C for 48...
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