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<p>The limited chemical and dispersive stabilities of transition metal carbides and nitrides (MXenes) significantly hinder their practical applications despite the demonstrated excellent performances. In this study, colloidally stable Ti<sub>2</sub>CT<sub><i>x</i></sub>- and Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>-MXene aqueous dispersions (0.1&#xa0;mg·mL<sup>−1</sup>) were achieved through a corrosion inhibition strategy by incorporating sodium tartrate (ST). The addition of ST (0.3&#xa0;mg·mL<sup>−1</sup>) effectively increased the activation energy and enthalpy for the degradation of Ti<sub>2</sub>CT<sub><i>x</i></sub> and Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> in aqueous solutions, largely extending their time constants to 565.5&#xa0;h and 239.3&#xa0;days, respectively. This strong oxidation inhibition effect of ST preserved the structural integrity and colloidal properties of both MXenes without compromising their electrical and electrochemical performances. The vacuum-filtered Ti<sub>2</sub>CT<sub><i>x</i></sub> and Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> film electrodes demonstrated capacitance retentions of 96.7% and 88.5% after 96&#xa0;h and 24&#xa0;days of aging at 25&#xa0;°C, respectively. Multiscale simulations revealed that single-deprotonated ST<sup>−</sup> preferentially adsorbed onto edges and defect sites of MXene nanosheets via oxygen heteroatoms on the carbonyl moiety bonding to Ti vacancies. This work offers a promising and straightforward approach to stabilize the diluted MXene aqueous dispersions, fundamentally address their oxidation issues, and meet the requirements for temporary storage.</p> Graphical Abstract <p></p>

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Achieving colloidal stability of diluted MXene dispersions through corrosion inhibition strategy with sodium tartrate

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • Hang Li,
  • Bao-Min Fan,
  • Hua Tian,
  • Shi-Hao Wang

摘要

The limited chemical and dispersive stabilities of transition metal carbides and nitrides (MXenes) significantly hinder their practical applications despite the demonstrated excellent performances. In this study, colloidally stable Ti2CTx- and Ti3C2Tx-MXene aqueous dispersions (0.1 mg·mL−1) were achieved through a corrosion inhibition strategy by incorporating sodium tartrate (ST). The addition of ST (0.3 mg·mL−1) effectively increased the activation energy and enthalpy for the degradation of Ti2CTx and Ti3C2Tx in aqueous solutions, largely extending their time constants to 565.5 h and 239.3 days, respectively. This strong oxidation inhibition effect of ST preserved the structural integrity and colloidal properties of both MXenes without compromising their electrical and electrochemical performances. The vacuum-filtered Ti2CTx and Ti3C2Tx film electrodes demonstrated capacitance retentions of 96.7% and 88.5% after 96 h and 24 days of aging at 25 °C, respectively. Multiscale simulations revealed that single-deprotonated ST− preferentially adsorbed onto edges and defect sites of MXene nanosheets via oxygen heteroatoms on the carbonyl moiety bonding to Ti vacancies. This work offers a promising and straightforward approach to stabilize the diluted MXene aqueous dispersions, fundamentally address their oxidation issues, and meet the requirements for temporary storage.

Graphical Abstract