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The reason for this slowdown is still disputed.","posed_since":"","precise":"Explain the drop of the exchange current density of the hydrogen evolution and oxidation reactions on Pt from pH 0 to pH 13 (about two orders of magnitude), distinguishing between hydrogen binding energy shifts, the interfacial water reorganization and the potential of zero free charge, and cation-hydroxyl interactions. An answer is a model that predicts the measured rate versus pH and versus cation identity.","problem_ref":null,"references":"","settled_by":"pH- and cation-resolved kinetics on single-crystal Pt with in situ spectroscopy, matched by constant-potential simulations of the proton or water discharge step.","status_note":"","title":"Why hydrogen evolution on platinum slows down in alkaline 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