When analyzed using a fixed reference potential, we found that the hydrogen reaction order is essentially one for the HOR at larger (positive) overpotentials and zero for the HER at larger (negative) overpotentials, thus justifying the use of the general KL correction in these potential ranges. However, fits of the kinetic current data with a generalized Butler-Volmer model in a potential range around equilibrium provided differing kinetic parameters. Fits with a fixed value of α a + α c = 2 confirmed reaction orders of essentially one and zero for the HOR and HER branches, respectively, as determined at larger overpotentials. In contrast, fits with a fixed value of α a + α c = 1 yielded fractional reaction orders. Performing a selfconsistency iteration of KL mass-transport correction and Butler-Volmer fits, we showed that the obtained kinetic parameters are both self-and Nernst-consistent: self-consistent in terms of the reaction orders assumed for mass-transport correction and Nernst-consistent in terms of the equilibrium potential as a function of hydrogen partial pressure fulfilling the Nernst equation.