Comments on “The phase-shift method for determining Langmuir adsorption isotherms of over-potentially deposited hydrogen for the cathodic H2 evolution reaction at poly-Re/aqueous electrolyte interfaces” [Hydrogen Energy 30 (2005) 485-499]

Simulations of the impedance data for the hydrogen evolution reaction have been carried out. They indicate that there is no relation between the phase-shift and the surface coverage by adsorbed hydrogen. The surface coverage may only be obtained form the rate constants of the hydrogen adsorption and desorption steps.