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CN-122013527-A - MXene composite fiber, preparation method thereof, flexible electrode and supercapacitor

CN122013527ACN 122013527 ACN122013527 ACN 122013527ACN-122013527-A

Abstract

The invention provides an MXene composite fiber, a preparation method thereof, a flexible electrode and a super capacitor, and belongs to the technical field of MXene composite fibers, wherein Co (NO 3 ) 2 ·6H 2 O is mixed with a solvent to obtain a solution D1; zn (CH 3 COO) 2 ·2H 2 O is mixed with a solvent to obtain a solution D2, dimethyl imidazole is mixed with the solvent to obtain a solution D3, the solution D1 is mixed with the solution D2 to obtain a mixed solution D4, the MXene fiber is immersed into the mixed solution D4, then the solution D3 is added, and the mixed solution is aged and dried to obtain the MXene@ZIF-6/ZIF-8 composite fiber.

Inventors

  • ZHANG MEI
  • Xie Fanyu
  • Chu Menghan
  • DONG XIYANG
  • CAO JINLEI
  • LI HONGWEI

Assignees

  • 北京服装学院

Dates

Publication Date
20260512
Application Date
20251221

Claims (10)

  1. 1. The preparation method of the MXene composite fiber is characterized by comprising the following steps: Co (NO 3 ) 2 ·6H 2 O is mixed with a solvent to obtain a solution D1, zn (CH 3 COO) 2 ·2H 2 O is mixed with the solvent to obtain a solution D2, dimethyl imidazole is mixed with the solvent to obtain a solution D3, the solution D1 is mixed with the solution D2 to obtain a mixed solution D4, and the MXene fiber is immersed in the mixed solution D4, then the solution D3 is added, aged and dried to obtain the MXene@ZIF-6/ZIF-8 composite fiber.
  2. 2. The method for producing a MXene composite fiber according to claim 1, wherein, Co (NO 3 ) 2 ·6H 2 O to solvent ratio is 0.12-0.33 mol/mL; And/or Zn (CH 3 COO) 2 ·2H 2 O to solvent ratio of 0.12-0.33 mol/mL; and/or the ratio of the dimethylimidazole to the solvent is 0.4-0.87 mmol/mL; And/or the solvent is selected from at least one of methanol and ethanol; and/or the volume ratio of the solution D1 to the solution D2 to the solution D3 is 1:1:1-1:1:3; and/or the mass-volume ratio of the MXene fiber to the solution D4 is 0.01:30-0.03:30.
  3. 3. The method for producing a MXene composite fiber according to claim 1, wherein, The aging conditions comprise an aging temperature of 25-27 ℃ and an aging time of 12-48 hours; The drying conditions comprise a drying temperature of 50-60 ℃ and a drying time of 12-24 hours.
  4. 4. The method for producing a MXene composite fiber according to claim 1, wherein, The MXene fiber is obtained by spinning solution through a multi-stage size spinning channel; the multi-stage size comprises a channel I and a channel II which are nested in sequence; the inner diameter of the channel I is greater than the inner diameter of the channel II; Preferably, the inner diameter of the channel I is 1.2-1.6 mm; preferably, the inner diameter of the channel II is 0.6-1.2 mm; preferably, the spinning solution is MXene-Ti 3 C 2 T X , and the spinning advancing rate is 85-100 ml/h.
  5. 5. The MXene composite fiber according to any of the claims 1-4, wherein, The diameter of the composite fiber is 250-300 mu m.
  6. 6. A flexible electrode, characterized in that the MXene composite fiber as defined in claim 5 is used as an electrode material.
  7. 7. A parallel fiber type symmetrical super capacitor is characterized in that, The anode material and the cathode material of the super capacitor are both MXene composite fibers obtained by the preparation method of any one of 1-4, the distance between the MXene composite fibers serving as the anode material and the MXene composite fibers serving as the cathode material is 0.2-0.6 cm, the fiber length is required to be 1-1.5 cm, and the electrolyte is PVA/H 2 SO 4 gel electrolyte with the concentration of 1.0-2.0 mol/L.
  8. 8. The parallel fiber type symmetrical supercapacitor according to claim 7, wherein, The area specific capacitance of the super capacitor is 789-1433.9 mF cm -2 .
  9. 9. The zinc ion hybrid supercapacitor is characterized in that 1-3 mol/L ZnSO 4 is used as an electrolyte, the MXene composite fiber obtained by the preparation method of any one of 1-4 is used as a cathode material, and the anode material is 70% rGO/MXene composite fiber.
  10. 10. The zinc-ion hybrid supercapacitor of claim 9, wherein the zinc-ion hybrid supercapacitor can be cycled 6500 times under ZnSO 4 electrolyte with excellent capacitance retention up to 92.9%, area specific capacitance >400mF cm -2 , and energy density all > symmetric supercapacitor.

Description

MXene composite fiber, preparation method thereof, flexible electrode and supercapacitor Technical Field The invention belongs to the technical field of MXene composite fibers, and particularly relates to an MXene composite fiber, a preparation method thereof, a flexible electrode and a supercapacitor. Background As a two-dimensional transition metal carbide/nitride (MXene) which has been emerging in recent years, it is a two-dimensional material having a layered structure, similar to graphene. The unique advantages of MXene are represented in various aspects, namely the two-dimensional lamellar structure of MXene endows large specific surface area and interlayer spacing, the metal-like conductivity ensures efficient electron transmission, and the controllable surface functional groups provide space for chemical modification. Unlike carbon materials, MXene electrode materials can store energy through both physical adsorption/desorption and reversible redox reactions, and thus MXene has a capacity value far exceeding that of carbon materials. However, adjacent MXene nanoplatelets tend to aggregate and stack due to interactions of van der waals forces, the spacing between layers is reduced, electrolyte ion transport is hindered, and it is difficult to meet the current demand for high performance electrodes. Researchers can effectively transfer the excellent performance of MXene in a microscopic scale to a macroscopic scale through reasonable structural design and controllable preparation, and excellent mechanical, electrical, thermal and other performances are shown, so that the MXene composite fiber is applied to the fields of functional fabrics, sensing, energy sources and the like. At present, the structure and morphology of the MXene fiber electrode can be regulated and controlled by controlling the size and interlayer spacing of the MXene sheet layers, constructing a three-dimensional/porous structure and other strategies, and the performance of the MXene fiber electrode can be further improved by optimizing a material system and a preparation process. Disclosure of Invention In order to solve the problems in the prior art, the invention provides an MXene composite fiber, a preparation method and application thereof, wherein the composite fiber has developed interlayer electroactive sites, ordered ion diffusion channels and strong interfacial charge transfer, and the constructed fiber type flexible supercapacitor has excellent energy density and high capacitance characteristics. In the first aspect, the invention provides a preparation method of an MXene composite fiber, which comprises the steps of mixing Co (NO 3)2·6H2 O with a solvent to obtain a solution D1, mixing Zn (CH 3COO)2·2H2 O with the solvent to obtain a solution D2, mixing dimethyl imidazole with the solvent to obtain a solution D3, mixing the solution D1 with the solution D2 to obtain a mixed solution D4, immersing the MXene fiber in the mixed solution D4, adding the solution D3, aging and drying to obtain the MXene@ZIF-6/ZIF-8 composite fiber. As a preferable technical scheme, co (the ratio of NO 3)2·6H2 O to the solvent is 0.12-0.33 mol/mL. As a preferable technical scheme, the ratio of Zn (CH 3COO)2·2H2 O to solvent is 0.12-0.33 mol/mL. As a preferable technical scheme, the ratio of the dimethylimidazole to the solvent is 0.4-0.87 mmol/mL. As a preferable technical scheme, the solvent is at least one selected from methanol and ethanol. As a preferable technical scheme, the volume ratio of the solution D1 to the solution D2 to the solution D3 is 1:1:1 to 1:1:3, and is preferably 1:1:1. As a preferable technical scheme, the mass-volume ratio of the MXene fiber to the solution D4 is 0.01:30-0.03:30, and is preferably 0.01:30. As a preferable technical scheme, the aging conditions comprise an aging temperature of 25-27 ℃ and an aging time of 12-48 h. As a preferable technical scheme, the drying condition comprises a drying temperature of 50-60 ℃ and a drying time of 12-24 h. As a preferable technical scheme, the MXene fiber is obtained by spinning solution through a multi-stage size spinning channel; The multi-stage size comprises a channel I and a channel II which are nested in sequence, wherein the inner diameter of the channel I is larger than the inner diameter of the channel II, the inner diameter of the channel I is 1.2-1.6 mm, the inner diameter of the channel II is 0.6-1.2 mm, the spinning solution is MXene-Ti 3C2TX, and the spinning advancing rate is 85-100 ml/h. In a second aspect, the invention provides an MXene composite fiber obtained by any one of the preparation methods, wherein the diameter of the composite fiber is 250-300 μm. In a third aspect, the present invention provides a flexible electrode having the MXene composite fiber described above as an electrode material. In a fourth aspect, the invention provides a parallel fiber type symmetrical supercapacitor, wherein the anode material and the cathode material of the supe