Preparation method and application of a two-dimensional mxene/polydopamine composite desalination electrode material

A technology of polydopamine and electrode materials, applied in separation methods, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as capacity cannot be further increased, electrolyte ion diffusion limitation, material specific surface area limitation, etc., to improve electrolyte transmission Efficiency, improved utilization, and broad application prospects

Active Publication Date: 2022-05-31
SHANGHAI JIAO TONG UNIV
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  • Description
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Problems solved by technology

However, the reported MXene-polymer composite nanosheets are limited to covering the dense polymer layer on the MXene sheet, the specific surface area of ​​the material is limited, resulting in the capacity can not be further improved; at the same time, the dense polymer layer leads to electrolyte ions to the inner space of MXene The diffusion is limited and the mass transfer rate is slow, resulting in a low desalination rate of the material

Method used

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  • Preparation method and application of a two-dimensional mxene/polydopamine composite desalination electrode material
  • Preparation method and application of a two-dimensional mxene/polydopamine composite desalination electrode material
  • Preparation method and application of a two-dimensional mxene/polydopamine composite desalination electrode material

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Embodiment 1

[0029] The preparation method of mPDA / MXene is as follows:

[0030] (1) PEO 20 -b-PPO 70 -b-PEO 20 Self-assembly into cylindrical micelles: Dissolve 100 mg of P123 in 40 mL of deionized water and stir at 40 °C for 2 hours to form a polymer micelle solution.

[0031] (2) Add 6 mL of MXene solution (2 mg / mL) to the above polymer solution, add 100 mg of dopamine hydrochloride (DA HCl) after stirring for 1 hour, and continue stirring for 1 hour. The micelles can be adsorbed on the The surface of MXene, while the dopamine monomer was adsorbed by PEO, resulting in the formation of the close packing of P123 / dopamine composite micelles on the MXene nanosheets. 100 mg of tris (Tris) was added and the solution was adjusted to pH 8.5. 200 μL of aqueous ammonia solution was added dropwise to the mixture to initiate polymerization of dopamine for 12 hours. Washed with ethanol and water several times, centrifuged, and finally freeze-dried to obtain columnar mesoporous MXene / polydopamin...

Embodiment 2

[0034] The preparation method of CDI battery is as follows:

[0035] mPDA / MXene as Na storage + electrode, activated carbon as Cl storage -electrodes, assembled into a CDI cell. Preparation of electrode material: active material, conductive carbon black and PVDF with a mass ratio of 70%:20%:10% were mixed in NMP solvent to form a slurry. Drop the slurry on graphite paper (2.5×2.5cm 2 ), and dried at 60 °C for 12 h to obtain a CDI electrode material.

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Abstract

The invention discloses a preparation method of a two-dimensional MXene / polydopamine composite desalination electrode material, which is characterized by comprising the following steps: (1) self-assembly of block polymers: the present invention first uses polyethylene oxide-block ‑Polypropylene oxide‑block‑polyethylene oxide PEO 20 ‑b‑PPO 70 ‑b‑PEO 20 The triblock polymers self-assemble in solution to form columnar micelles as mesoporous soft templates; (2) Preparation of columnar mesoporous MXene / polydopamine two-dimensional composite nanosheets mPDA / MXene. The present invention also provides the application of the above-mentioned two-dimensional MXene / polydopamine composite desalting electrode material in CDI batteries. The invention uses P123 as a soft template to introduce mesoporous channels to both sides of the MXene, so that the material has a larger internal active specific surface area and an ion transport channel, which is expected to improve the electrochemical performance and has the application prospect of capacitive deionization.

Description

technical field [0001] The invention relates to the field of electrode materials for capacitive deionization, in particular to a preparation method of a two-dimensional MXene / polydopamine composite desalination electrode material containing in-plane columnar mesopores. Background technique [0002] In recent years, capacitive deionization (CDI), as a low-energy-consumption, pollution-free desalination technology, has become an effective solution to the freshwater crisis. The most widely studied CDI electrode materials are porous carbon materials. However, the theoretical capacitance of pure carbon materials is low, which greatly limits the desalination capacity (SAC) of the materials. Second, most porous carbon materials have a microporous structure, and the transport rate of the electrolyte inside the micropores is slow, resulting in a slow mass transfer rate of the material, thereby reducing the salt rejection rate (SAR). [0003] MXene (Ti 3 C 2 ) has high specific ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/06C08K7/00C08K3/14C08J9/00C02F1/469C08L79/04
CPCC08G73/06C08K7/00C08K3/14C08J9/00C02F1/4691C08J2379/04Y02A20/124
Inventor 杨骐绮麦亦勇李倩李晨向洛兴刘亚美刘睿懿姜思琦
Owner SHANGHAI JIAO TONG UNIV
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