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Preparation method and application of carbon nanotube foam-loaded core-shell Ni-Co LDH@Ni-Mn LDH

A carbon nanotube and core-shell technology, applied in the field of electrochemistry, can solve the problems of low device energy density, low specific capacitance, and limited application fields of electrode materials

Active Publication Date: 2019-08-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that combining with carbon materials can indeed improve the electrochemical performance of LDH, but their specific capacitance is low, which determines that the energy density of assembled devices will be low, which limits the application field of electrode materials
[0005] At present, the method of growing Ni-Co LDH@Ni-Mn LDH with core-shell structure on three-dimensional nitrogen-doped single-walled carbon nanotube foam to prepare Ni-Co LDH@Ni-Mn LDH / NSCS composite supercapacitor electrodes has not been reported yet.

Method used

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  • Preparation method and application of carbon nanotube foam-loaded core-shell Ni-Co LDH@Ni-Mn LDH
  • Preparation method and application of carbon nanotube foam-loaded core-shell Ni-Co LDH@Ni-Mn LDH
  • Preparation method and application of carbon nanotube foam-loaded core-shell Ni-Co LDH@Ni-Mn LDH

Examples

Experimental program
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Embodiment 1

[0034] (1) ultrasonically disperse 200 mg of single-walled carbon nanotubes in a mixture of concentrated sulfuric acid (98.0% by mass fraction) and concentrated nitric acid (68.0% by mass) with a volume ratio of 3:1, reflux at 70°C for 2h, and add distilled water Dilute and stir, filter with suction and wash with distilled water until neutral, and finally dilute with distilled water to obtain a concentration of 1 mg mL -1 acidified single-walled carbon nanotube dispersion.

[0035] (2) Cut the polyurethane foam into 1×1×1cm 3 cube (in the specific implementation process, the foam can be cut into the required size and shape according to the requirements), and then washed by washing powder, distilled water, and ethanol ultrasonically (ultrasonic power is 500W, and the time is 20min) and dried at 70°C for 12h Finally, immerse in the acidified single-wall carbon nanotube dispersion obtained in step (1), and squeeze with tweezers for 3-5 seconds to fully coat the carbon nanotube s...

Embodiment 2

[0041] In this embodiment, steps (1), (2), and (3) are the same as in Embodiment 1.

[0042] (4) Dissolve manganese chloride, nickel chloride, and hexamethylenetetramine in 40 mL of distilled water, and stir for 30 minutes. The concentrations of manganese chloride, nickel chloride, and hexamethylenetetramine in the solution are 0.0035 mol in turn. L -1 , 0.0055mol L -1 , 0.0375mol L -1 . Transfer the solution into a 50mL polytetrafluoroethylene reactor, immerse the NSCS in the solution, put the reactor into an oil bath at 90°C for chemical deposition for 40 minutes, and after cooling to room temperature, take out the sample and wash it with distilled water 2 to 3 times at 60°C Dry at high temperature for 12h to obtain Ni-Mn LDH / NSCS.

[0043] image 3 The SEM images of Ni-Mn LDH / NSCS prepared for this example, (a) and (b) are the SEM images of Ni-MnLDH / NSCS at low magnification, it can be observed that Ni-Mn LDH is spherical and The distribution is relatively sparse. Fi...

Embodiment 3

[0046] In this embodiment, steps (1), (2), and (3) are the same as in Embodiment 1.

[0047] (4) Nickel chloride, cobalt chloride, urea are dissolved in methanol aqueous solution (methanol and water volume ratio are 6:1), fully stir to form pink solution, the content of nickel chloride, cobalt chloride, urea in this pink solution The final concentration is 0.0024mol L in turn -1 , 0.0048mol L -1 , 0.1667mol L -1 , transfer the above pink solution into a 50mL polytetrafluoroethylene reactor, and immerse the NSCS obtained in step (3) into it, and conduct a hydrothermal reaction at 120°C for 6h; after cooling to room temperature, take out the sample and wash it with distilled water and absolute ethanol , the sample was placed in an oven at 60°C for 12h to obtain Ni-Co LDH / NSCS.

[0048] (5) Dissolve manganese chloride, nickel chloride, and hexamethylenetetramine in 40mL distilled water, and stir for 30min to obtain an aqueous solution; The concentration is 0.0035mol L in turn...

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Abstract

The invention discloses a preparation method and an application of a core-shell Ni-Co LDH@Ni-Mn LDH. The method comprises steps that (a), carbon nanotube solution is prepared; (b), nitrogen-doped carbon nanotube foam (NSCS) is prepared by coating carbon tubes and a fire process; (c), NSCS is placed in mixed solution of nickel chloride, cobalt chloride, urea, distilled water and methanol, after hydrothermal reaction and drying, Ni-Co LDH / NSCS is obtained; and (d), a composite material of the core-shell structure is obtained through chemical deposition of Ni-Co LDH / NSCS placed in mixed solutionof manganese chloride, nickel chloride, hexamethylenetetramine and distilled water at 90 DEG C. The composite material can be applied to wearable portable energy storage devices, compared with the single-layer LDH, the core-shell composite material increases the specific surface and electrochemical active sites of active materials, contact between the material and the electrolyte is made to be more complete, volumetric deformation is further reduced, advantages of nuclear and shell parts can be fully performed, and overall electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a preparation method and application of a carbon nanotube foam loaded core-shell Ni-Co LDH@Ni-MnLDH / NSCS. Background technique [0002] Carbon nanotubes are one-dimensional carbon materials, which are formed by wrapping graphene sheets with carbon atoms, which are formed by sp 2 Hybridization is covalently bonded. According to the number of wrapped graphene layers, carbon nanotubes are divided into single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). Carbon nanotubes are widely used in the synthesis of composite materials for supercapacitor electrodes due to their unique internal structure, good physical and chemical stability, low weight density, and good electrical conductivity. Since their gravimetric and volumetric capacitances are lower than those of activated carbons, combining the two to prepare composites can improve their electrochemical p...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36H01G11/68H01G11/70B82Y30/00
CPCB82Y30/00H01G11/24H01G11/30H01G11/36H01G11/68H01G11/70H01G11/86Y02E60/13
Inventor 佟浩金凤巧孟晴李婷婷刘江张校刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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