MXene/graphene/carbon nanotube gel with high magnification and long service life as well as preparation method and application of MXene/graphene/carbon nanotube gel

A graphene nanosheet and carbon nanotube technology, which can be used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. Agglomeration and oxidation inhibition effect

Active Publication Date: 2021-11-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problems that the existing supercapacitor electrode material MXene is easy to oxidize and easy to stack and agglomerate, and provides a high-rate, long-life MXene / Graphene / carbon nanotube gel and its preparation method and application

Method used

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  • MXene/graphene/carbon nanotube gel with high magnification and long service life as well as preparation method and application of MXene/graphene/carbon nanotube gel
  • MXene/graphene/carbon nanotube gel with high magnification and long service life as well as preparation method and application of MXene/graphene/carbon nanotube gel
  • MXene/graphene/carbon nanotube gel with high magnification and long service life as well as preparation method and application of MXene/graphene/carbon nanotube gel

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Embodiment 1

[0039] Embodiment 1: A high-magnification, long-life MXene / graphene / carbon nanotube gel of this embodiment is formed by cross-linking two-dimensional MXene sheets, graphene nanosheets, and carbon nanotubes. The MXene The / graphene / carbon nanotube gel has a three-dimensional hierarchical porous structure with a pore size distribution of 2-10 μm.

[0040] The method for the high rate of preparation embodiment 1, long-life MXene / graphene / carbon nanotube gel is carried out as follows:

[0041] Step 1: Treat Ti with hydrochloric acid and lithium fluoride3 AlC 2 Carry out etching, then ultrasonically assist stripping at 40kHz for 20min, then centrifuge at 4000rpm for 30min, filter to constant volume, and obtain MXene dispersion, the concentration of the obtained MXene dispersion is 10mg·mL -1 ; Said by hydrochloric acid, lithium fluoride to Ti 3 AlC 2 The specific steps for etching are: weigh 0.8g of lithium fluoride and add it to 10mL of 9M hydrochloric acid solution and stir fo...

Embodiment 2

[0047] Embodiment 2: the concrete step that prepares supercapacitor negative electrode material with the MXene / graphene / carbon nanotube gel of high rate of embodiment 1, long life is: use ultrapure water with MXene / graphene / carbon nanotube gel After soaking and washing, the slices are directly used as electrodes for testing. After the test, they are cleaned, dried in a vacuum oven for more than 12 hours, and weighed.

[0048] image 3 It is the specific capacity change curve of MXene / graphene / carbon nanotube gel as supercapacitor electrode at different scanning speeds, Figure 4 is the cycle performance curve of MXene / graphene / carbon nanotube gel as supercapacitor electrode.

[0049] It can be seen from the figure that the electrochemical performance of MXene / graphene / carbon nanotubes is tested under three-electrode conditions, when the scan rate is 2mV s -1 , the specific capacitance can reach 312F·g -1 , when the scan rate increases to 3V·s -1 , the capacitance retention...

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Abstract

The invention discloses MXene/graphene/carbon nanotube gel with high magnification and long service life as well as a preparation method and application of the MXene/graphene/carbon nanotube gel. The invention belongs to the field of supercapacitor electrode materials and preparation thereof. The invention aims to solve the technical problem that the existing supercapacitor electrode material MXene is easy to oxidize, stack and agglomerate. The MXene/graphene/carbon nanotube gel provided by the invention is formed by mutual crosslinking of a two-dimensional MXene sheet layer, a graphene nanosheet and a carbon nanotube, and the MXene/graphene/carbon nanotube gel has a three-dimensional hierarchical porous structure. The three-dimensional porous open structure effectively inhibits serious stacking and agglomeration of two-dimensional MXene sheet layers, improves the surface utilization rate of the MXene material, increases the number of active sites, and increases the specific capacity of the material; meanwhile, due to the addition of graphene and vitamin C, the oxidation of MXene can be inhibited, so that the gel has relatively good oxidation resistance; in addition, the porous structure can be used as a reservoir to shorten the diffusion path of electrolyte ions and improve the rate characteristic of the electrode.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode materials and preparation thereof, in particular to a high-magnification, long-life MXene / graphene / carbon nanotube gel and a preparation method and application thereof. Background technique [0002] Supercapacitors have important applications in many fields due to their advantages such as fast charge and discharge rates, high power density, long cycle life, and wide operating temperature range. As one of the key components of supercapacitors, electrode materials play a vital role in its performance. As a new class of two-dimensional materials emerging in recent years, MXene includes transition metal carbides, nitrides or carbonitrides, which have abundant surface functional groups, high Young's modulus, large interlayer spacing, metallic conductivity, large It has been proved to be a very promising electrode material for supercapacitors due to its specific surface area and other advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/26H01G11/86
CPCH01G11/36H01G11/26H01G11/86Y02E60/13
Inventor 闫俊杨雪王倩
Owner HARBIN ENG UNIV
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