Edge Capping of 2D-MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

Varun Natu, James L. Hart, Maxim Sokol, Helen Chiang, Mitra L. Taheri, Michel W. Barsoum

Research output: Contribution to journalReview articlepeer-review

245 Scopus citations

Abstract

MXenes have shown promise in myriad applications, such as energy storage, catalysis, EMI shielding, among many others. However, MXene oxidation in aqueous colloidal suspensions when stored in water at ambient conditions remains a challenge. It is now shown that by simply capping the edges of individual MXene flakes, Ti3C2Tz and V2CTz, by polyanions such as polyphosphates, polysilicates or polyborates, it is possible to quite significantly reduce their propensity for oxidation even when held in aerated water for weeks. This breakthrough resulted from the realization that the edges of MXene sheets are positively charged. It is thus an example of selectively functionalizing the edges differently from the MXene sheet surfaces.

Original languageEnglish
Pages (from-to)12655-12660
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number36
DOIs
StatePublished - 2 Sep 2019
Externally publishedYes

Keywords

  • 2D materials
  • MXenes
  • functionalization
  • oxidation

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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