Impedance spectroscopy of H and OH adsorption on stepped single-crystal platinumelectrodes in alkaline and acidic media

文献情報

出版日 2010-07-07

DOI 10.1039/C0CP00104J

インパクトファクター 3.676

著者

K. J. P. Schouten, M. J. T. C. van der Niet, M. T. M. Koper

原文を見る

要旨

The adsorption kinetics of hydrogen and hydroxyl on Pt(111) and stepped Pt[n(111) × (110)] electrodes with n = 29, 9, and 4 in acidic and alkaline electrolytes have been studied using impedance spectroscopy. We found a potential dependent charge transfer resistance, Rct, (∼30 Ω cm2 to ∼1 kΩ cm2) for hydrogen underpotential deposition in alkaline media (0.05 M NaOH), whereas in acidic media (0.025 M HClO4) Rct was too low to be determined accurately. Assuming simple (mean field) isotherms to fit our data, we obtain repulsive interactions between Hupd at the (111) terrace and effective attractive interactions at the steps. The adsorption of OH on (111) terraces is fast in both acidic and alkaline media.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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