Advances in the Chemical Stabilization of MXenes

Abstract

MXenes are 2D nanomaterials with a wide array of possible compositions; they feature a unique combination of properties such as high electrical conductivity, hydrophilicity, and colloidal stability which makes them attractive for a variety of applications. However, the shelf life and industrial utility of MXenes face challenges due to their tendency to oxidize and disintegrate, particularly in dispersions. Thus, it is crucial to find effective ways to ensure the degradation stability of MXenes. This feature article reviews the key factors affecting the degradation of MXenes such as pH, concentration of the dispersion, humidity, and storage temperature. In addition, we review our group’s progress in mitigating the degradation of MXenes such as low-temperature storage, the use of antioxidants, and thermal annealing, particularly for Ti3C2T z . These simple approaches may allow for applications of MXenes on a commercial scale.

Plasmon assisted Ti3C2Tx grafting and surface termination tuning for enhancement of flake stability and humidity sensing performance

“…39 However, the stability of the akes can be signicantly improved by immobilization of various chemical ligands on the surface of the akes, including electrostatic graing, hydrogen bonds, and the use of covalent graing. 39,49,[62][63][64] In our case, we also observed a signicant increase in sensor stability due to previous surface graing.…”

Selective Ion Transport in Two-Dimensional Ti3C2Tx Nanochannel Decorated by Crown Ether

“…Characterizations of Nanosheets and the ACE-Modified Laminar Ti 3 C 2 T x Membrane (CTM). The Ti 3 C 2 T x nanosheets were synthesized via the MILD method, 26 wherein the Al layer was selectively etched to delaminate the Ti 3 AlC 2 phase into a monolayer 38 (as depicted in Figure 2a). Successful etching of the Al layers was confirmed by the complete disappearance of the (008) diffraction peak at 39°a nd the leftward shift of the (002) peak observed in the XRD spectrum for Ti 3 C 2 T x , as shown in Figure 2b.…”

Theoretical progress of MXenes as electrocatalysts for the hydrogen evolution reaction

“…22 Several excellent reviews on MXenes have been published, and they mainly focus on their synthesis, characterization and electrocatalytic properties from the perspective of experiments. 17,23,24 Compared with trial-and-error experimental research studies focusing on the macroscopic performance of catalysts, the theoretical investigations pay more attention to the surface chemistry, electronic structure and reaction mechanism of catalysts at the atomic scale, which play a crucial role in helping us understand the electrochemical reaction processes and predict the ideal electrocatalysts.…”