Abstract
The hydrogen discharge on the Raney nickel composite coated electrode is investigated in 30% wt NaOH aqueous solution at 70°C by ac impedance technique. The easiest pathway for the hydrogen evolution reaction (HER) is the Volmer-Heyrovsky mechanism. Both Volmer and Heyrovsky steps control the reaction. The increase in the electrocatalytic activity from 30% wt NaOH to 1.04 M NaOH at 70°C is related to a larger exchange current density of the HER.
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