Correction and supplement to the determination of the optimum intermediate frequency for the phase-shift method [Chun et al., Int. J. Hydrogen Energy 30 (2005) 247–259, 1423–1436]

The phase-shift method and correlation constants, i.e., the electrochemical impedance spectroscopy (EIS) techniques for studying the 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), have been proposed and verified to determine the Langmuir, Frumkin, and Temkin adsorption isotherms of hydrogen and related electrode kinetic and thermodynamic parameters at the interfaces. This paper is a correction and supplement to our previously published papers [Chun JH, Jeon SK, Kim BK, Chun JY. Determination of the Langmuir adsorption isotherms of under- and over-potentially deposited hydrogen for the cathodic H2 evolution reaction at poly-Ir/aqueous electrolyte interfaces using the phase-shift method. Int J Hydrogen Energy 2005;30(3):247–59. Chun JH, Jeon SK, Kim NY, Chun JY. The phase-shift method for determining Langmuir and Temkin adsorption isotherms of over-potentially deposited hydrogen for the cathodic H2 evolution reaction at the poly-Pt/H2SO4 aqueous electrolyte interface. Int J Hydrogen Energy 2005;30(13–14):1423–36.]. The lack of a Gaussian analysis for the rates of change of −φ vs. E and θ vs. E for the optimum intermediate frequency results in an unclear conclusion.