Abstract
Abstract Electrical equivalent models were tested for the description of the hydrogen evolution reaction on various polycrystalline and rough electrodes in alkaline solution. It was found that the model containing the constant phase element best describes the experimental impedance curves, but in some cases the fractal or porous electrode models had to be used. Determination of the surface roughness allowed us to estimate the real electrode activity. It was found that, except for the electrodes containing noble metals, the main contribution to the activity arises from the large surface area.
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