Electrochemical performance of Ti3C2Tx MXene in aqueous media: towards ultrasensitive H2O2 sensing

Abstract An extensive characterization of pristine and oxidized Ti 3 C 2 T x (T: O, OH, F) MXene showed that exposure of MXene to an anodic potential in the aqueous solution oxidizes the nanomaterial forming TiO 2 layer or TiO 2 domains with subsequent TiO 2 dissolution by F − ions, making the resulting nanomaterial less electrochemically active compared to the pristine Ti 3 C 2 T x . The Ti 3 C 2 T x could be thus applied for electrochemical reactions in a cathodic potential window i.e. for ultrasensitive detection of H 2 O 2 down to nM level with a response time of ∼10 s. The manuscript also shows electrochemical behavior of Ti 3 C 2 T x modified electrode towards oxidation of NADH and towards oxygen reduction reactions.