The HOR/HER kinetics and the micropolarization exchange current density Avoiding the use of pH buffers to overcome mass transport limitations restricts the pH range where the intrinsic HOR/HER kinetics are accessible to pH > 9. Nevertheless, this may still be adequate to determine which mechanism governs the HOR/HER kinetics in alkaline environment. Specifically, the intricate evolution of the reaction orders with respect to pH and 𝑎 𝐻 2 should not only reveal if the HOR/HER proceeds through the T-V path or the H-V path, but also which step is rds under which conditions. Following the experimental and analytical procedures laid out previously to obtain and MT-correct the micropolarization exchange current density, we present the results for all the electrolyte compositions explored (Tab. 2) in Fig. , combined with notable literature results. We explored three characteristic properties of the employed electrolyte: The type of cation (Li, Na, K), the type of anion (Cl, ClO4, OH), and their concentration. In Fig. the evolution of 𝑖 0,𝑚𝑖𝑐𝑟𝑜 with pH is displayed for each case in the range where the HOR/HER kinetics can be accurately resolved (kineticcontrolled regime and accurately MT-corrected mixed regime). Multiple datasets were collected in each case (indicated in the legend) which allowed us to determine corresponding uncertainties, employing also Eq. 32e for the MT-correction. We did not find any notable trends with respect to electrolyte type and concentration, with all differences lying close to the measurement uncertainty. The only substantial difference observed is a somewhat larger 𝑖 0,𝑚𝑖𝑐𝑟𝑜 for the pure hydroxides vs the chloride and perchlorate containing electrolytes in the pH range from 12-12.5. While 𝑖 0,𝑚𝑖𝑐𝑟𝑜 seems to increase with pH before passing through a shallow maximum at around pH 11-12, accurate quantification of the reaction order in the pH region 8 to 10 is limited from the high uncertainties in the mixed regime. At pH > 11-12, 𝑖 0,𝑚𝑖𝑐𝑟𝑜 decreases in all measurements. Our results are different from the comparable study by Huang et. al (Fig. ). However, we think that their values are influenced using highly concentrated buffer systems and the application of the simple B-V fit method in combination with the inappropriate use of the Koutecký-Levich equation (Eq. 34c) for the MT-correction in the micropolarization region.