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Reversible Hydrogen Electrodes
In article number 2309749, Brian A. Rosen and co‐workers show for the first time how atomic substitutions in the MXene can enable its stability under oxidizing electrochemical conditions. The cover image is therefore two MXene sheets set up abstractly as a fuel cell, where the substituted MXene (with the yellow atoms) is exposed to the oxygen electrode and the conventional...
MXenes have gained significant attention, particularly Ti3C2Tz, as materials with favorable properties for energy storage and conversion applications. The overwhelming majority of electrochemical durability studies are based on durability in the hydrogen evolution window, well below the reversible hydrogen electrode where degradation via electrochemical oxidation is less relevant. Consequently, few...