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CN-121973507-A - MXene/wool keratin electrode and preparation method and application thereof

CN121973507ACN 121973507 ACN121973507 ACN 121973507ACN-121973507-A

Abstract

The invention discloses an MXene/wool keratin electrode and a preparation method and application thereof, comprising the following steps of taking a crosslinked keratin solution as core layer fluid, taking MXene dispersion liquid as sheath layer fluid, coaxially spinning heat release dominant fibers and weaving a heat release layer; the method comprises the steps of braiding a transition layer by using PI filament bundles of which the surface is immersed with MXene, spraying a micro valve, coaxially spinning electricity storage leading fibers by using keratin solution as core layer fluid and MXene dispersion liquid as sheath layer fluid, braiding an electricity storage layer, laminating an exothermic layer, the transition layer and the electricity storage layer, penetrating and fixing in the Z direction, filling a polyvinyl alcohol/lithium chloride gel precursor, and carrying out in-situ phase change solidification to obtain the MXene/wool keratin electrode. According to the invention, through differential functional fiber design, asymmetric three-dimensional woven structure and double-mechanism dynamic regulation and control, deep coordination of photo-thermal conversion and electrochemical energy storage is realized, and the problems of fixed functions, low-temperature failure and poor flexibility adaptability of the traditional device are solved.

Inventors

  • LIU YUQING
  • YANG XUEQIN
  • BAI TIANYU

Assignees

  • 苏州大学

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. A method for preparing an MXene/wool keratin electrode, comprising the steps of: S1, preparing heat release leading fibers by taking a first wool keratin solution after crosslinking treatment as a core layer fluid, taking a first MXene dispersion liquid as a sheath layer fluid, and weaving a high-density heat release layer by the heat release leading fibers; S2, weaving a low-density transition layer by polyimide filament bundles with the surfaces being soaked with MXene, and spraying a thermally-responsive micro valve on the transition layer; S3, taking a second wool keratin solution as a core layer fluid, taking a second MXene dispersion liquid as a sheath layer fluid, coaxially spinning to prepare electricity storage leading type fibers, taking the electricity storage leading type fibers as wefts, taking the electricity storage leading type fibers and carbon fiber filaments as warps, and weaving a medium-density electricity storage layer; s4, sequentially laminating the heat release layer, the transition layer and the electricity storage layer, and penetrating and fixing the heat release layer, the transition layer and the electricity storage layer through Z-direction consolidation yarns, wherein the Z-direction consolidation yarns adopt polyimide filament bundles to form a braided fabric; and S5, filling a polyvinyl alcohol/lithium chloride gel precursor in the braided fabric under the vacuum negative pressure condition, and obtaining the MXene/wool keratin electrode after in-situ phase change solidification.
  2. 2. The method for producing an MXene/wool keratin electrode as defined in claim 1, wherein in S1, the concentration of the first wool keratin solution is 12-15wt% by genipin cross-linking treatment, and the concentration of the first MXene dispersion is 8-10mg/mL; And/or, the flow rate ratio of the sheath fluid to the core fluid is (4-4.5): 1 when the coaxial spinning is performed.
  3. 3. The method for preparing the MXene/wool keratin electrode as recited in claim 1, wherein in S2, the preparation method of the micro valve comprises the steps of mixing poly-N-isopropyl acrylamide and multi-wall carbon nano tubes, and preparing composite gel microspheres with the diameter of 200-300 μm by an inverse suspension polymerization method to serve as the micro valve.
  4. 4. The method of producing an MXene/wool keratin electrode according to claim 1, characterized in that in S3, the concentration of the second wool keratin solution is 10-12wt%, the concentration of the second MXene dispersion is 4-6mg/mL; and/or, the flow rate ratio of the sheath fluid to the core fluid is (2.5-3): 1 during the coaxial spinning.
  5. 5. The method for preparing an MXene/wool keratin electrode according to claim 1, characterized in that the braiding density of the heat release layer is 10-12 pieces/cm, the porosity is 50-55%, the braiding density of the transition layer is 4-6 pieces/cm, the porosity is 80-85%, the braiding density of the electricity storage layer is 6-8 pieces/cm, and the porosity is 75-80%.
  6. 6. The method of making an MXene/wool keratin electrode according to claim 1, characterized in that in S4 the Z-direction consolidated yarn has a tension of 0.5-1.5N when it is through-set.
  7. 7. The method for preparing the MXene/wool keratin electrode according to claim 1, wherein in S5, the concentration of the polyvinyl alcohol in the polyvinyl alcohol/lithium chloride gel precursor is 10-15wt% and the concentration of the lithium chloride is 2-4mol/L, and the in-situ phase change solidification is completed by a freeze-thawing cycle method.
  8. 8. The method for producing an MXene/wool keratin electrode according to claim 1, characterized in that between S4 and S5, a single-sided thermo-compression photo-treatment is performed to the heat release layer, forming a dense barrier layer on the heat release layer surface.
  9. 9. An MXene/wool keratin electrode prepared by the method of any one of claims 1-8.
  10. 10. Use of the MXene/wool keratin electrode of claim 9 in a wearable electronic device.

Description

MXene/wool keratin electrode and preparation method and application thereof Technical Field The invention relates to the technical field of functional fibers and flexible energy storage devices, in particular to an MXene/wool keratin electrode, and a preparation method and application thereof. Background With the rapid development of wearable electronic devices, the development of fabric electrodes with high energy density, excellent mechanical flexibility and environmental adaptability has become a current research hotspot. Transition metal carbo/nitrides (MXene), by virtue of their metalloid conductivity, abundant surface functionality, and excellent photothermal conversion capabilities, are considered ideal materials for constructing next generation smart fabrics. Although the preparation of regenerated fibers by wet spinning technology and the construction of conductive fabrics by knitting or braiding technology have provided a certain technological basis in the prior art, the existing MXene-based flexible devices still have significant technical drawbacks in terms of multifunctional integration and complex environmental adaptability. Taking patent CN115433434a as an example, the prior art adopts a three-dimensional woven structure, but the design emphasis is on improving electromagnetic shielding and overall mechanical properties, and internal fibers and functional fillers are uniformly distributed. This structure lacks a differential layering design for the "thermal-electrical" transport direction. In the light-heat-storage integrated application scene, due to the lack of an effective heat flow regulating mechanism, the high temperature generated by light heat can be indiscriminately diffused to the periphery, so that electrolyte in an energy storage unit is easily dried or side reaction is caused due to overhigh temperature, and the performance of a device is reduced or even fails. In addition, CN112593302a relates to a technical solution of coaxial or spiral fibers, although the conductivity or strain performance is improved in the single fiber dimension, a macroscopically efficient three-dimensional thermal management network cannot be constructed. Such techniques lack intermediate transition structures that have both electronic conduction and thermal blocking functions, making it difficult to achieve directional and controlled transfer of heat from the photothermal layer to the energy storage layer. In practical application, the design with single dimension leads to poor environmental adaptability of the device, namely, heat cannot be effectively locked in extremely cold environment to maintain energy storage activity, and redundant heat cannot be blocked under strong light irradiation. In summary, the prior art only uses conventional material compounding or textile technology, and it is difficult to solve the contradiction between "heat release" and electrochemical energy storage sensitivity to temperature caused by photo-thermal conversion. Therefore, there is a need to develop a novel fabric electrode based on asymmetric three-dimensional structural design and integrated with intelligent thermal management mechanism to meet the requirements of efficient photo-thermal energy storage in all-weather and wide temperature range. Disclosure of Invention Aiming at the defects in the prior art, the invention provides an MXene/wool keratin electrode and a preparation method and application thereof, and the deep coordination of photo-thermal conversion and electrochemical energy storage is realized through differential functional fiber design, asymmetric three-dimensional woven structure and double-mechanism dynamic regulation and control, so that the problems of fixed function, low-temperature failure and poor flexibility adaptability of the traditional device are solved. In order to solve the technical problems, the first aspect of the invention provides a preparation method of an MXene/wool keratin electrode, which comprises the following steps: S1, preparing heat release leading fibers by taking a first wool keratin solution after crosslinking treatment as a core layer fluid, taking a first MXene (Ti 3C2Tx) dispersion liquid as a sheath layer fluid through coaxial spinning, and weaving a high-density heat release layer by the heat release leading fibers; s2, weaving a low-density transition layer by Polyimide (PI) filament bundles with the surfaces being soaked with MXene, and spraying a thermally-responsive micro valve on the transition layer; S3, taking a second wool keratin solution as a core layer fluid, taking a second MXene dispersion liquid as a sheath layer fluid, coaxially spinning to prepare electricity storage leading type fibers, taking the electricity storage leading type fibers as wefts, taking the electricity storage leading type fibers and carbon fiber filaments as warps, and weaving a medium-density electricity storage layer; s4, sequentially laminating the heat release layer, the tr