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

Active Publication Date: 2022-01-04
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 two-dimensional MXene/polydopamine composite desalination electrode material
  • Preparation method and application of two-dimensional MXene/polydopamine composite desalination electrode material
  • Preparation method and application of 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) PEOs 20 -b-PPO 70 -b-PEO 20 Self-assembly into columnar micelles: Dissolve 100mg of P123 in 40mL of deionized water and stir at 40°C for 2 hours to form a polymer micelles solution.

[0031] (2) Add 6 mL of MXene solution (2 mg / mL) to the above polymer solution, stir for 1 hour, add 100 mg of dopamine hydrochloride (DA·HCl), 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, thus forming a close packing of P123 / dopamine composite micelles on the MXene nanosheets. 100 mg of Tris was added to adjust the solution to pH 8.5. 200 μL of ammonia solution was added dropwise to the mixture to initiate the polymerization reaction of dopamine, which was reacted for 12 hours. Washed several times with ethanol and water, centrifuged, and finally freeze-dried to obtain columnar mesoporous MXene / polydopamine two-dimensional comp...

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 materials: Active material, conductive carbon black and PVDF with a mass ratio of 70%:20%:10% are mixed in NMP solvent to form a slurry. Drop the slurry on graphite paper (2.5×2.5cm 2 ), dried at 60°C for 12h to obtain the CDI electrode material.

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Abstract

The invention discloses a preparation method of a two-dimensional MXene / polydopamine composite desalination electrode material, wherein the preparation method is characterized by comprising the following steps: (1) self-assembly of a block polymer: firstly, carrying out self-assembly on a polyethylene oxide-block-polypropylene oxide-block-polyethylene oxide PEO20-b-PPO70-b-PEO20 triblock polymer in a solution to form columnar micelles, and taking the columnar micelles as a mesoporous soft template; and (2) preparing the columnar mesoporous MXene / polydopamine two-dimensional composite nanosheet (mPDA / MXene). The invention also provides an application of the two-dimensional MXene / polydopamine composite desalination electrode material in a CDI battery. According to the invention, P123 is used as a soft template, and mesoporous channels are introduced to two sides of MXene, so that the material has a larger internal active specific surface area and ion transmission channels, the electrochemical performance is expected to be improved, and the application prospect of capacitive deionization is achieved.

Description

technical field [0001] The invention relates to the field of electrode materials for capacitive deionization, in particular to a method for preparing 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, pollution-free desalination technology, has emerged as 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 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 removal rate (SAR). [0003] MXene (Ti 3 C 2 ) has high specific capacitance and g...

Claims

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Application Information

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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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