In contrast, in the derivation of the KL equations ( ) and ( ), a unity reaction order in H 2 concentration on a fixed potential scale is assumed, under a common fixed reference potential. The non-unity value determined on an overpotential scale therefore does not necessarily preclude a unity reaction order on a fixed scale, and thus applicability of the KL equations ( ) or (15). We will therefore employ a straightforward mass-transport correction according to the general KL equation (15) and check for self-consistency a posteriori by determining the fixed-scale reaction order of the obtained kinetic currents. Moreover, we will determine the influence of the reverse reaction by comparing the kinetic currents obtained from the general and simplified KL correction schemes. Fig. shows iR-corrected RDE curves at 100% H 2 saturation for different rotation rates.