Sulfonated MXene-polyaniline composite electrode material and preparation method and application thereof

CN121609412APending Publication Date: 2026-03-06ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202511799181.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-02
Publication Date
2026-03-06

AI Technical Summary

Technical Problem

Existing capacitive deionization electrode materials have shortcomings in terms of stability, specific surface area, and CDI performance. In particular, they face problems such as easy aggregation, oxidation, and low adsorption capacity of MXene sheets when treating high-concentration brine.

Method used

By in-situ growing sulfonated MXene-polyaniline composite material on MXene nanosheets, and utilizing the electrostatic adsorption of sulfonated MXene-Ti3C2Tx with protonated aniline and the polymerization initiated by an oxidant, a Ti3C2-SO3H/PANI composite electrode material is formed, which inhibits the self-stacking and oxidation of MXene and improves electrochemical performance.

Benefits of technology

It enhances the cycling stability and specific surface area of ​​the electrode, increases the ion adsorption sites, promotes the transfer of electrons and ions, and improves the capacitive deionization performance, especially the desalination efficiency in high-concentration and low-concentration brine.

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Abstract

The invention provides a sulfonated MXene-polyaniline composite electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly dispersing single / few-layer MXene-Ti3C2Tx, sulfamic acid, hydrochloric acid and sodium nitrite in an aqueous solution at 0-5 DEG C to obtain a first mixed solution, carrying out a stirring reaction, and carrying out freeze drying to obtain sulfonated MXene; and (2) uniformly dispersing sulfonated MXene, aniline and an oxidizing agent in an acid solution to obtain a second mixed solution, and performing polymerization reaction and freeze drying to obtain the sulfonated MXene-polyaniline composite electrode material. Surface functional groups of MXene are regulated and controlled before in-situ polymerization, an introduced sulfonic acid group can continuously provide protons, the protonation degree of PANI is improved, a polymer main chain is kept at a locally low pH value, deprotonation is effectively inhibited, high oxidation-reduction activity and good reversibility are achieved, meanwhile, intercalation and coating of polyaniline are achieved, and the stability of the polymer is improved. The key problems that the MXene is easy to oxidize in an aqueous solution and the cycling stability is poor are effectively relieved.
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