Abstract
Abstract The potential-sweep method was applied to mercury cathode in HCl, HBr, and HI aqueous solutions. Resulting current-potential curves for the hydrogen evolution reaction revealed a plateau, i.e., an almost constant current in the potential region from −0.65 to −1.0 V vs. N.H.E. which is the characteristic behaviour expected from the theoretical non-steady state analysis for the electrochemical mechanism. Effects of the sweep rate and anion are briefly discussed.
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