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

An extensive characterization of pristine and oxidized Ti3C2Tx (T: [dbnd]O, –OH, –F) MXene showed that exposure of MXene to an anodic potential in the aqueous solution oxidizes the nanomaterial forming TiO2 layer or TiO2 domains with subsequent TiO2 dissolution by F− ions, making the resulting nanomaterial less electrochemically active compared to the pristine Ti3C2Tx. The Ti3C2Tx could be thus applied for electrochemical reactions in a cathodic potential window i.e. for ultrasensitive detection of H2O2 down to nM level with a response time of ∼10 s. The manuscript also shows electrochemical behavior of Ti3C2Tx modified electrode towards oxidation of NADH and towards oxygen reduction reactions. © 2017 Elsevier Ltd311532, APVV, Agentúra na Podporu Výskumu a Vývoja; ERDF, European Regional Development Fund; QNRF, Qatar National Research FundSlovak Scientific Grant Agency VEGA [2/0090/16]; Slovak Research and Development Agency APVV [14-0753]; European Research Council under the European Union's Seventh Framework Program [311532]; NPRP from the Qatar National Research Fund (a member of the Qatar Foundation) [6381-1-078]; Research & Development Operational Programme – ERD