| Abstract Scope |
In this work we show that MXene edges are positively charged, while the surface is negatively charged. Using this information, we show that it is also possible to functionalize the MXene edges different from their surfaces. One of the biggest drawbacks that limit MXenes' long term storage and mass production is their oxidation, when stored in water under ambient atmospheres. Prior to this work, it was known that oxidation in MXene begins at edges of the 2D sheets and then propagates inwards. Herein, we show that selective functionalization of the edges by polyphosphates, polyborates or polysilicates significantly reduces their oxidation rate in water. Dispersed flakes of Ti3C2Tz and V2C flakes that were stored for weeks in water exposed to the atmosphere were subsequently found to be oxidation free. We further show this method works for several different MXenes. |