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Nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber as well as preparation method and application thereof

A high-conductivity, nanosheet technology for hybrid/electric double-layer capacitor fabrication, hybrid capacitor electrodes, inorganic raw rayon, etc., which can solve problems such as exhibiting limited lateral dimensions, MXene fiber barriers, etc.

Active Publication Date: 2020-10-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, although the length of the parent MAX crystals is tens of micrometers, the obtained MXenes mostly exhibit limited lateral dimensions of only a few hundred nanometers, resulting in additional grain boundaries, which constitute a significant factor for the construction of macroscopic MXene fibers. obstacle

Method used

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  • Nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber as well as preparation method and application thereof
  • Nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber as well as preparation method and application thereof
  • Nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of Titanium Carbide Colloidal Aqueous Solution: Ti 3 AlC 2 The powder (1 g) was put into HF solution (10 wt%, 30 mL), stirred for 10 minutes, washed with distilled water for 3 times, and then dried in a vacuum oven at 80 °C for 24 hours. The dried powder was placed in tetramethylammonium hydroxide aqueous solution (25 wt%, 10 mL) and stirred continuously for 24 hours; the resulting suspension was centrifuged at 5000 rpm for 10 minutes, and the bottom precipitate was washed with deionized water and dried; then Redisperse in deionized water, sonicate at room temperature for 15 minutes, centrifuge at 3500rpm for 15 minutes, take the upper suspension and centrifuge at 8000rpm for 15 minutes, and take the lower suspension to obtain an aqueous solution of titanium carbide colloid with a concentration of 20 mg / mL.

[0054] Fill the titanium carbide colloidal aqueous solution into a plastic syringe with a rotating nozzle (conventional stainless steel spinning needl...

Embodiment 2

[0065] A high-performance flexible supercapacitor was obtained by using the orderly stacked macroscopic high-conductivity MXene ribbon fiber of Example 1 as the negative electrode, and assembling it with polyvinyl alcohol-sulfuric acid electrolyte and positive electrode rGO fiber.

[0066] Using the method in Example 1, the titanium carbide colloidal aqueous solution was replaced with a commercially available GO aqueous solution with a concentration of 10 mg / mL (the thickness of the GO sheet was about 1 nm, and the lateral dimension was 3-5 μm), to obtain GO initial fibers, which were then immersed in 90 °C hydroiodic acid (57 wt%) aqueous solution for 5 hours, and then washed with water to obtain rGO fibers as the cathode.

[0067] Under stirring, 1 g of PVA powder was dissolved in 10 mL of distilled water at 90 °C until a clear solution was obtained. After adding 1 g of sulfuric acid and stirring, the clear solution was cooled to room temperature to obtain a polyvinyl alcohol...

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Abstract

The invention discloses a nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber as well as a preparation method and application thereof. The preparation method comprisesthe following steps that Ti3AlC2 powder is added into an HF solution, and stirring and washing are carried out to obtain crystals; then the crystals are added into a tetramethylammonium hydroxide aqueous solution, stirring is carried out, centrifugal treatment and washing are sequentially carried out, then re-dispersing in water is carried out, and ultrasonic treatment is carried out to obtain atitanium carbide aqueous solution; the titanium carbide aqueous solution is injected into a coagulating bath to obtain initial fibers; and acid treatment and washing are carried out on the initial fibers to obtain the nanosheet orderly stacked type macroscopic high-conductivity MXene ribbon-like fiber. Based on the inherent metal conductivity and the directional stacking structure of a Ti3C2 nanosheet, the prepared ribbon-like fiber has excellent conductivity (up to 2458 S*cm<-1>), and the research highlights the huge potential of the MXene as a macroscopic assembly platform, and enlarges theapplication of the MXene material in wearable electronic products.

Description

technical field [0001] The invention belongs to the technology of flexible fibrous electrodes, and in particular relates to a macroscopic high-conductivity MXene ribbon fiber with ordered stacking of nanosheets, a preparation method and application thereof. Background technique [0002] Based on the recent explosive development of miniaturized and wearable electronics, it has become increasingly important to develop flexible fibrous electrodes with high electrical conductivity and reasonable electrochemical performance. Recently, two-dimensional nanosheets with thicknesses on the order of several angstroms and lateral dimensions in the micrometer range have been proposed as ideal materials for constructing macroscopic fibrous electrodes. In particular, fibers with almost perfectly ordered nanosheet structures can maximize the performance utilization of individual nanosheets. For example, graphene oxide nanosheets with a hydrophilic surface can be well dispersed in aqueous m...

Claims

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Application Information

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IPC IPC(8): D01F9/08C01B32/921H01G11/24H01G11/30H01G11/86H01G11/26
CPCD01F9/08C01B32/921H01G11/24H01G11/30H01G11/86H01G11/26C01P2004/50C01P2004/20C01P2004/04C01P2004/01C01P2002/88C01P2002/85C01P2002/72C01P2004/03C01P2006/40Y02E60/13
Inventor 耿凤霞祝超
Owner SUZHOU UNIV
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