with the thermodynamic factors Here, 𝐾 𝑖 = 𝑘 𝑖 /𝑘 -𝑖 are equilibrium constants. Equation 14 decomposes the overall reaction resistance into four resistive terms. These terms usually differ by several orders of magnitude, as illustrated in Figure , with the largest term determining the overall reaction resistance and thus the net rate. This term is defined as the RDT. The RDT of the OER is shown to change with potential, with a switch from i=3 to i=2 at 1.5 V (Figure ). This transition constitutes the fundamental origin of potential-dependent Tafel slopes. In addition to the intrinsic multistep kinetics, the LRE also impacts measured Tafel slopes.