Following the onset of C1 Pt dissolution peak, we observe the onset of the peak corresponding to the dissolution of the less noble metal (C1'). Whereas we do not observe any A1 peak that would correspond to the anodic transient dissolution of Pt, a clear shoulder peak corresponding to the dissolution of the less noble metal A1' is present for both Pt-Ni and Pt-Cu alloys. Since A1' less noble metal dissolution can only be a direct consequence of the A1 Pt dissolution , it is highly likely that the A1 Pt dissolution is simply out of our limit of detection (in contrast to the significantly harsher WPW cycles; Figures ). Nevertheless, a careful inspection of the observed dissolution profiles reveals many other important messages. For instance, similar differences in the intensities of A1' and C1' less noble metal dissolutions between Pt-Ni (Figure ) and Pt-Cu (Figure ) can be observed as in the case of WPW cycles (Figures ). In other words, in the case of Pt-Ni alloy, C1' Ni dissolution is dominant in comparison to A1' Ni dissolution, whereas the situation is reversed in the case of Pt-Cu (with A1' Cu dissolution being the dominant peak). This brings us back to the C1 Pt dissolution peak. Our evidence suggests that C1 cathodic Pt dissolution, as a consequence of oxide-place-exchange is already the dominant Pt-dissolution mechanism at the UPL as low as 0.925 V (Figures and). This goes in line with the observations made by Ahluwalia and co-workers where C1 Pt dissolution became dominant only above 0.9 V 65 . Thus, at UPLs above 0.9 V, the choice of LPL governs the extent of cathodic corrosion of Pt . Consequently, with more Pt dissolution, a higher amount of previously protected M gets exposed to the acidic environment, thus resulting in an increased dissolution of the less noble metal. This is in good agreement with the trends observed during ADT 50 cm 2 single-cell tests (Figure ), where we can presume that the observed voltage losses at the HCDs can be correlated to the dissolution of Ni and its consequent interaction with the ionomer .