Ti3C2, one of the most studied MXenes (M is an early transition metal, and X is either C or N), has attracted considerable attention due to their excellent electrical conductivity, hydrophilicity, and catalytic activity. To date, most MXenes are prepared from powders and chemical etching under conditions of either long duration (generally ≥8 h) or high temperature (generally ≥35°C). In this study, Ti3C2 with –F and –O/–OH terminal groups was successfully obtained by electrochemically etching porous Ti3AlC2 sheet electrodes in NH4HF2 solution at room temperature. The reaction mechanism and the effect of voltage were demonstrated. Electrochemical etching could induce subsequent over-etching to generate carbide-derived carbons.
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