Analysis of the Electrochemical Method of Producing Environmentally Friendly Hydrogen Energy Carrier According to the Evans Diagram

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Abstract

The possibility of reducing energy costs during hydrogen release was realized using a system in which the anodic process of oxygen release was replaced by the process of dissolution of an electronegative metal (aluminum alloy). The rate of hydrogen release on aluminum, among other equal conditions (temperature and concentration of the electrolyte), depends on the polarization of hydrogen release. On aluminum - a metal of the third group of the periodic table of elements, it is high. The dissolution (corrosion) rate of aluminum can be increased by short-circuiting with an electrode with a low hydrogen evolution polarization, such as nickel. The ratio of hydrogen evolution currents on aluminum and nickel was estimated. The effect of alkali concentration and temperature on the current density, polarization and polarizability of electrodes made of aluminum alloy containing Cu, Mg, Mn and Fe was determined. It was shown that in a 0.1 mol l − 1 NaOH solution at a temperature of 20°C, the polarization resistance of hydrogen release on nickel is lower than on aluminum, and the hydrogen release rate on Ni is higher. At high temperatures and sodium hydroxide concentrations, the polarizability of metal dissolution and hydrogen release on aluminum increases sharply and exceeds those on nickel.

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