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Macroscopic high-conductivity mxene ribbon fiber with ordered stacking of nanosheets and its preparation method and application

A high-conductivity, nanosheet technology, applied in hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, inorganic raw rayon, etc., can solve the problems of MXene fiber barriers, exhibit limited lateral dimensions, etc., to achieve high volume Effect of energy density, high electrochemical performance

Active Publication Date: 2021-12-28
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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  • Macroscopic high-conductivity mxene ribbon fiber with ordered stacking of nanosheets and its preparation method and application
  • Macroscopic high-conductivity mxene ribbon fiber with ordered stacking of nanosheets and its preparation method and application
  • Macroscopic high-conductivity mxene ribbon fiber with ordered stacking of nanosheets and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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.

[0055] Fill the titanium carbide colloidal aqueous solution into a plastic syringe with a rotating nozzle (conventional stainless steel spinning needl...

Embodiment 2

[0066] 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.

[0067] 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.

[0068] 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 macroscopic high-conductivity MXene ribbon fiber in which nanosheets are stacked in an orderly manner and a preparation method and application thereof. Ti 3 AlC 2 The powder is put into HF solution, stirred and washed to obtain crystals; then the crystals are added to tetramethylammonium hydroxide aqueous solution, and after stirring, they are subjected to centrifugation, washing, and then redispersed in water, and ultrasonic treatment is obtained to obtain titanium carbide aqueous solution; The titanium aqueous solution was injected into the coagulation bath to obtain initial fibers; the initial fibers were acid-treated and washed to obtain macroscopically highly conductive MXene ribbon fibers with ordered stacks of nanosheets. Ti-based 3 C 2 Intrinsic metallic conductivity and oriented stacking structure of nanosheets, the as-prepared ribbon fibers have excellent electrical conductivity (up to 2458 S cm ‑1 ). This study highlights the great potential of MXenes as a macroscopic assembly platform and expands the application of MXene materials in wearable electronics.

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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Patent Type & Authority Patents(China)
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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