This led us to explore the H-upd as we hypothesized that it is the reaction intermediate of the HOR/HER. Using unconventional electrochemical methods, we captured its pseudocapacitive contribution both in the presence of H2 and at potentials extending beyond the classical H-upd region to more negative values. This revealed that the H-upd charge is not bound by a maximum coverage and increases beyond the accepted 1 ML value. Analyzing the H-upd features at different scan rates, we determined that the associated rate constant exhibits a surprisingly consistent pH dependence in all electrolytes. This means that the H-upd kinetics do not follow classical Butler-Volmer kinetics but can be described with a pH dependent activation barrier within the framework of B-V kinetics. Finaly, the equilibrium H-upd peak positions revealed a clear positive potential shift with increasing H2 activity in alkaline media, which would be consistent with the H-upd being the HOR/HER intermediate of a T-V-like path.