The A layer of the MAX phases can selectively be etched yielding a relatively new class of materials, the so-called MXenes. The name was chosen to demonstrate the removal of the A element as well as their similarity to graphene. They were first synthesized in 2011 (Gogotsi and Barsoum) and in the meantime approximately 20 members of this family have been prepared.
Beside their chemical composition their surface structure is the determining factor for their properties. They are obtained after treatment with aqueous hydrofluoric acid, thus mainly F- and OH- groups are identified on their surface.
We focus on alternative etching methods and investigate the influence of their surface structure in their properties. They are already discussed in the context of many different applications, such as batteries, supercaps and in catalysis.
