Recovery of oxidized two-dimensional MXenes through high frequency nanoscale electromechanical vibration

Heba Ahmed, Hossein Alijani, Ahmed El-Ghazaly, Joseph Halim, Billy J. Murdoch, Yemima Ehrnst, Emily Massahud, Amgad R. Rezk (), Johanna Rosen and Leslie Y. Yeo ()
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Heba Ahmed: RMIT University
Hossein Alijani: RMIT University
Ahmed El-Ghazaly: Linköping University
Joseph Halim: Linköping University
Billy J. Murdoch: RMIT University
Yemima Ehrnst: RMIT University
Emily Massahud: RMIT University
Amgad R. Rezk: RMIT University
Johanna Rosen: Linköping University
Leslie Y. Yeo: RMIT University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract MXenes hold immense potential given their superior electrical properties. The practical adoption of these promising materials is, however, severely constrained by their oxidative susceptibility, leading to significant performance deterioration and lifespan limitations. Attempts to preserve MXenes have been limited, and it has not been possible thus far to reverse the material’s performance. In this work, we show that subjecting oxidized micron or nanometer thickness dry MXene films—even those constructed from nanometer-order solution-dispersed oxidized flakes—to just one minute of 10 MHz nanoscale electromechanical vibration leads to considerable removal of its surface oxide layer, whilst preserving its structure and characteristics. Importantly, electrochemical performance is recovered close to that of their original state: the pseudocapacitance, which decreased by almost 50% due to its oxidation, reverses to approximately 98% of its original value, with good capacitance retention ( ≈ 93%) following 10,000 charge–discharge cycles at 10 A g−1. These promising results allude to the exciting possibility for rejuvenating the material for reuse, therefore offering a more economical and sustainable route that improves its potential for practical translation.

Date: 2023
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DOI: 10.1038/s41467-022-34699-3

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