The influence of hydrogen absorption reaction (HAR) proceeding through H-ads with kinetic or with diffusion control on the dependence of the elements R-1, R-2, C-2 of the equivalent electrical circuit for hydrogen evolution reaction (HER) on the electrode potential E has been considered. It has been shown that if HER proceeds through the Volmer-Heyrovsky mechanism, then the presence of HAR reduces the slope dlogR(2)/dE at all E and the slope dlogC(2)/dE at sufficiently high cathodic polarisations. In the case of the Volmer-Tafel mechanism the presence of HAR mainly affects the resistance R-2. The character of the dependences of R-1, R-2, C-2 on E is the same for both kinetic and diffusion control of HAR. An interpretation of the experimental impedance data for HER on CoSi2 in 0.5 M H2SO4 has been presented. (C) 2016 Elsevier Ltd. All rights reserved.