Abstract
The electrocatalytic activity of nickel black electrodes for the hydrogen evolution reaction (HER) in alkaline solutions was studied. Three types of electrode were obtained through electrodeposition from different plating baths and their electrocatalytic properties were evaluated through slow potentiodynamic sweeps. The apparent and real exchange current densities and the Tafel slopes were calculated and compared to those of Raney nickel electrodes. The importance of the superficial topography on the apparent electrocatalytic characteristics was emphasized and some evidence was given to demonstrate that, when the electrode is previously aged in alkaline solution, the HER is produced on a thin nickel hydroxide overlayer.
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