[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5229/JKES.2012.15.1.054

Determination of the Frumkin and Temkin Adsorption Isotherms of Hydrogen at Nickel/Acidic and Alkaline Aqueous Solution Interfaces Using the Phase-Shift Method and Correlation Constants

Chun, Jang-H. (Department of Electronic Engineering, Kwangwoon University)

Publication Information

Journal of the Korean Electrochemical Society / v.15, no.1, 2012 , pp. 54-66 More about this Journal

Abstract

The phase-shift method and correlation constants, which are unique electrochemical impedance spectroscopy techniques for studying the linear relationship between the phase shift ( $90^{\circ}{\geq}-{\varphi}{\geq}0^{\circ}$ ) vs. potential (E) behavior for the optimum intermediate frequency ( $f_o$ ) and the fractional surface coverage ( $0{\leq}{\theta}{\leq}1$ ) vs. E behavior, are proposed and verified to determine the Frumkin, Langmuir, and Temkin adsorption isotherms and the related electrode kinetic and thermodynamic parameters. At Ni/0.5 M $H_2SO_4$ and 0.1M LiOH aqueous solution interfaces, the Frumkin and Temkin adsorption isotherms ( ${\theta}$ vs. E) of H for the cathodic hydrogen ( $H_2$ ) evolution, interaction parameters (g), equilibrium constants (K), standard Gibbs energies ( ${\Delta}G^0_{\theta}$ ) of H adsorption, and rates of change (r) of ${\Delta}G^0_{\theta}$ with ${\theta}$ have been determined using the phase-shift method and correlation constants. A lateral repulsive interaction (g>0) between the adsorbed H species appears. The value of K in the alkaline aqueous solution is much greater than that in the acidic aqueous solution.

Keywords

Phase-shift method; Correlation constants; Hydrogen adsorption; Frumkin; Langmuir; Temkin adsorption isotherms; Nickel;

Citations & Related Records

Times Cited By KSCI : 1 (Citation Analysis)

Reference
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