Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti₃AlC₂

Abstract

2D Ti3C2 nanosheets, multilayer structures, and conical scrolls produced by room temperature exfoliation of Ti3AlC2 in HF are reported. Since Ti3AlC2 is a member of a 60+ group of layered ternary carbides and nitrides, this discovery opens a door to the synthesis of a large number of other 2D crystals.

Transition Metal‐Promoted V2CO2 (MXenes): A New and Highly Active Catalyst for Hydrogen Evolution Reaction

“…Very recently, a new class of 2D layered materials with a general formula of M n +1 X n labeled MXenes has been reported 12, 13, 14, 15, 16. Shortly after the synthesis of MXenes,12 their possible application as anode materials for Li ion batteries (LIBs) has been explored greatly and these MXenes exhibit good capability for high charge–discharge rates 14, 17, 18, 19.…”

“…Shortly after the synthesis of MXenes,12 their possible application as anode materials for Li ion batteries (LIBs) has been explored greatly and these MXenes exhibit good capability for high charge–discharge rates 14, 17, 18, 19. Besides LIBs, other applications, such as non‐Li‐ion batteries,20, 21 hydrogen storage,22, 23 supercapacitor,24 and thermoelectric materials,25 have also been investigated.…”

“…MXenes were predicted to be potential heterogeneous catalysts owing to their high surface area and excellent thermostability as well 26. Recalling the fact that the release of H 2 can always be observed during the synthesis process of MXenes,12 it is very possible that MXenes may be good catalyst for HER, which is never reported yet.…”

In Situ Formed Protective Barrier Enabled by Sulfur@Titanium Carbide (MXene) Ink for Achieving High‐Capacity, Long Lifetime Li‐S Batteries

“…Recently, an emerging class of 2D transition metal carbides and nitrides, so‐called MXenes, has been reported 30, 31. By selectively etching the A atomic layer from the parent MAX phase (where M represents an early transition metal, A is typically aluminum (Al) or gallium, and X is C and/or N) or other ternary layered ceramics, MXenes terminated with abundant functional groups, such as oxygen (—O), hydroxyl (—OH), and/or fluoride (—F), are obtained, which can be expressed via the formula of M n +1 X n T x (where n = 1, 2, or 3 and T is a terminating group) 32, 33, 34.…”

Synthesis of two-dimensional molybdenum carbide, Mo 2 C, from the gallium based atomic laminate Mo 2 Ga 2 C

“…Examples of experimentally realized MXene compounds reported to date, are: Ti3C2, Ti2C, Ta4C3, TiNbC, (V0.5, Cr0.5)3C2, Ti3CNx (x < 1), V2C, and Nb2C [5][6][7]. These compounds can be generated by exfoliation of the corresponded laminated MAX phases upon selective etching of the A element using a suitable etchant.…”