Localizing the potential of the valence band edge is more challenging in view of the irreversible oxidation found for this material, which prevents an unambiguous determination of an inflection point in EMAS (Fig. ). Irreversible oxidation of 2H-MoS2 has previously been reported, and is most likely due to oxidation of Mo 4+ to Mo 6+ . We interpret the pronounced oxidation peak in the DPV measurement at 0.77 V (Fig. ) as the valence band edge. This agrees with the potential of 0.8 V during the oxidative ECG scan (Figure ) at which the conductivity vanishes almost completely. This finding can be rationalized with a compensation of the n-dopants as well as the oxidative degradation once the valence band edge is reached. It is also in reasonable agreement with the EMAS traces in Fig. , considering that upon reaching the valence band, one would expect a competition between induced absorption (due to band gap renormalization) and bleaching of the excitonic transitions (due to band filling).