The hydrogen evolution reaction was studied on Ni‐Mo pressed powder electrodes in 1 M NaOH at 25 and 70°C using the steady‐state polarization and ac impedance techniques. It was found that the activity of these electrodes increases with an increase in the molybdenum content and decreases with an increase in the pressure applied during the preparation. In order to explain the ac impedance data various models were tried, and it was found that the fractal model well approximates the experimental data. The analysis of the kinetic parameters indicates that an increase in the surface area may be responsible for the increased electrochemical activity.
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Chen et al. (1992) studied this question.