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Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions
Author(s) -
Natu Varun,
Hart James L.,
Sokol Maxim,
Chiang Helen,
Taheri Mitra L.,
Barsoum Michel W.
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201906138
Subject(s) - mxenes , aqueous solution , colloid , chemical engineering , catalysis , materials science , nanotechnology , chemistry , inorganic chemistry , organic chemistry , engineering
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, Ti 3 C 2 T z and V 2 CT z , 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.