Regenerating MXene by a Facile Chemical Treatment Method

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Titanium carbide (Ti3C2Tx) MXene is promising due to its conductivity and processability.
• Poor oxidation resistance hinders practical applications of MXene.
• Understanding MXene oxidation and recycling is crucial.

Purpose of the Study:

• To investigate the regeneration kinetics of oxidized Ti3C2Tx MXene.
• To develop a facile hydrofluoric acid (HF) post-treatment for MXene regeneration.
• To elucidate the mechanism behind HF-induced MXene restoration.

Main Methods:

• Systematic investigation using Raman spectroscopy, scanning electron microscopy (SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS).
• Development and application of a hydrofluoric acid (HF) post-treatment.
• Analysis of structural, morphological, and surface compositional changes.

Main Results:

• HF post-treatment effectively restores MXene nanosheet structure, morphology, and surface composition.
• Regeneration is linked to oxidizing agent removal kinetics.
• Formation of amorphous carbon and Ti(III) in fluorinated derivatives enhances electrical conductivity.

Conclusions:

• HF post-treatment is a critical and effective method for regenerating oxidized Ti3C2Tx MXene.
• This approach mitigates degradation and preserves conductivity, offering economic benefits.
• Findings facilitate the rational design of Ti3C2Tx-based devices and coatings.