Response to 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]

The phase-shift method, i.e., a linear relationship between the behavior (-φ vs. E) of the phase shift (0° ≤ -φ ≤ 90°) for the optimum intermediate frequency and that (θ vs. E) of the fractional surface coverage (1 ≥ θ ≥ 0) of under-potentially deposited hydrogen and over-potentially deposited hydrogen for the cathodic H-2 evolution reaction at noble and transition-metal/aqueous electrolyte interfaces, has been suggested and confirmed using cyclic voltammetric, linear sweep voltammetric or differential pulse voltammetric, and electrochemical impedance spectroscopic techniques. The comment on the phase-shift method by Lasia is discussed. The lack of a single equation for φ vs. θ as a function of potential (E) and frequency (f) and the unsuitable values of the electrode kinetic parameters (k, θ, β, η) and the equivalent circuit elements given in the comment result in a confused conclusion on the phase-shift method. The conclusion in the comment on the phase-shift method is unacceptable. © 2005 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.