Whether can practically the limiting current of cathode hydrogen evolution be achieved? This question is widely discussed to the present time. At the discussion of this question, two concepts are used usually: "limiting currents on protons" and "limiting currents on water". Often electrochemists do not differentiate these concepts. The first of them can be revealed from a slow delivery of protons (hydroxonium ions) to the electrode surface, and second - from a slow delivery of water molecules to the electrode surface. In both cases, the final product of the cathodic process is molecular hydrogen. However, the electrochemical processes flow in accordance to different schemes. It is shown that the interval of pH, in which limiting currents can be registered, can be substantially extended as compared to that presented in the literature.

• Бик Михайло Володимирович (хімічні науки)
• Вишневська Юлія Павлівна (технічні науки)

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