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Phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and preparation method thereof

A technology of carbon nanofibers and carbon nanotubes, which is applied in the field of phosphorus-doped cobalt-nickel sulfide/carbon nanotube-carbon nanofiber composite materials and its preparation, can solve the problems affecting catalytic characteristics and energy storage cycle stability, active site In order to achieve the effects of ingenious experimental design, improved electrochemical performance, and simple preparation process

Inactive Publication Date: 2016-11-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure cobalt-nickel sulfide is prone to self-aggregation, so that its active sites cannot be fully exposed, which seriously affects its catalytic properties and cycle stability of energy storage.

Method used

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  • Phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and preparation method thereof
  • Phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and preparation method thereof
  • Phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, the present embodiment comprises the following steps:

[0036] (1) Add 1 g polyacrylonitrile powder and 35 mg acidified carbon nanotubes to 10 mL N,N- In the dimethylformamide solvent, keep stirring to prepare a uniform viscous dispersion;

[0037] (2) The obtained mixed dispersion liquid was subjected to electrospinning, and the adjustment process parameters were: electrostatic field voltage 20 kV, spinning speed 0.3 mm min -1 , the receiving distance was 20 cm, and the carbon nanotube-polyacrylonitrile composite fiber membrane was prepared;

[0038] (3) The obtained blended membrane was pre-oxidized in an air atmosphere, the pre-oxidation temperature was 250 °C, and the heating rate was 1 °C min -1 , the pre-oxidation time is 1h, and the pre-oxidized carbon nanotube-polyacrylonitrile nanofiber film is prepared;

[0039] (4) The obtained blended membrane was subjected to high-temperature carbonization in high-purity nitrogen, the high-temperature carboni...

Embodiment 2

[0043] Example 2. Step (7) in Example 1 does not add a phosphorus source, and the rest are the same as in Example 1. The composite material finally obtained is recorded as CNT-CNF@NiCo 2 S 4 , its hydrogen evolution onset overpotential is -0.125 V, the Tafel slope is 66.7 mV / decade, and its performance is worse than that of phosphorus-doped composites, see attached Figure 4 .

Embodiment 3

[0044] Example 3. Change the amount of sodium hypophosphite in step (7) in Example 1 to 500 mg, and the rest are the same as in Example 1. The composite material obtained is denoted as PdopedCNT-CNF@NiCo 2 S 4 -1, the hydrogen evolution performance is similar to that in Example 1.

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Abstract

The invention belongs to the technical field of transitional-metal sulfide-carbon materials, and concretely relates to a phosphorus-doped nickel cobalt sulfide / carbon nanotube-carbon nanofiber composite material and a preparation method thereof. The preparation method comprises preparing carbon nanotube-doped carbon nanofiber through electrostatic spinning and high-temperature carbonization, then growing nickel cobalt sulfide nanorod in situ through a hydrothermal process, and finally calcining a phosphorus-containing precursor at a high temperature in an atmosphere of an inert gas, so as to prepare the phosphorus-doped composite material. The prepared carbon nanofiber possesses relatively large specific surface area, and the electric conductivity is effectively enhanced by doping carbon nanotube. By taking the carbon naofiber as a substrate, nickel cobalt sulfide nanorod uniformly densely grows on the surface of the composite fiber, and the synergistic effect of various substances is fully displayed. By doping phosphorus, the electrochemical activity of the composite material is further improved. The prepared phosphorus-doped nickel cobalt sulfide / carbon nanotube-carbon nanofiber composite material is applicable as a high-performance electro-catalytic material and an electrode material of lithium ion battery, solar cells and other new-energy-source devices.

Description

Technical field [0001] The invention belongs to the technical field of transition metal sulfide-carbon materials, and specifically relates to a phosphorus-doped cobalt nickel sulfide / carbon nanotube-carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Carbon nanofibers are widely used in the field of electrochemistry due to their high surface area and structural stability. Electrospinning technology provides a low-cost, large-scale method for preparing carbon nanofibers, and the microstructure of the fibers can be flexibly controlled. A variety of substances can be evenly blended into the spinning solution to enhance the various properties of carbon nanofibers. Using this as a base material and in-situ growth of electrochemically active substances can fully realize the good synergy of multiple substances to prepare composite materials with excellent performance. [0003] In recent years, transition metal chalcogenides have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C25B1/02C25B11/06
CPCB01J21/185B01J27/043B01J27/1853C25B1/02C25B11/04
Inventor 刘天西顾华昊黄云鹏左立增樊玮张龙生
Owner FUDAN UNIV
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