Calculating the integral for the Ti signals was more challenging due to the noisy signal, which impeded the baselining. Superimposing the Mn dissolution with the activity (as η at 1 mA cm -2 ) and electrochemical surface area proxy (as capacitance) shown in Figure implies some intriguing trends. Initially, the η decreases with a concomitant increase in the surface area. Preferential leaching of unalloyed Mn species could trigger such behavior, which is reasoned by the increase in Mn dissolution during the hold until the 7 th iteration. The initial leaching could cause an increase in surface roughness that would lead to more active sites exposed for catalytic processes.