Through the propagation of uncertainty, we can estimate the quality of the obtained value of 𝑖 0,𝑚𝑖𝑐𝑟𝑜 (Eq. 35c). A good approximation is to only consider the highest measurement uncertainty, commonly stemming from the determination of 𝑖 0,𝑚𝑖𝑐𝑟𝑜,𝑎𝑝𝑝 and the expression simplifies (Eq. 35c). We have exemplified the alkaline HOR/HER case by using the HOR/HER case of Eq. 35b-c (Eq. 35d-e) in Fig. .