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Kinetics of adenine adsorption on Au(1 1 1) electrodes: An impedance study

✍ Scribed by Francisco Prieto; Manuela Rueda; César Prado; Juan M. Feliu; Antonio Aldaz

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
438 KB
Volume
55
Category
Article
ISSN
0013-4686

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✦ Synopsis

The adsorption/desorption kinetics of adenine on Au(1 1 1) electrodes is studied by Electrochemical Impedance Spectroscopy (EIS) in 0.5 M NaF solutions at four adenine concentrations. The experimental procedure is designed in order to obtain impedance data unaffected by surface reconstruction on the entire potential region of adsorption. The frequency dispersion of the impedance at potentials of the adsorption region has been analysed according to the Frumkin-Melik-Gaykazyan adsorption theory without any "a priori" assumption about the potential dependence of the adsorption rate constant. The analysis provides the values of the adsorption capacitance, C ad , adsorption resistance, R ad and the Warburg coefficient, ad , at every potential, and from them the relaxations times H and D. A mixed adsorption-diffusion control has been detected and the specific rate constant of adsorption has been obtained in a wide potential region.

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Potential dependent adsorption behaviour
Potential dependent adsorption behaviour of thiothymine derivatives on the Au(1 1 1) electrode
✍ Moritz Hintze; Kay–Oliver Thiel; Antje Vollmer; Heiko Brunner; Constanze Donner 📂 Article 📅 2010 🏛 Elsevier Science 🌐 English ⚖ 501 KB

The adsorption behaviour of 2-thiothymine and 4-thiothymine on a Au(1 1 1) single crystal electrode has been studied using cyclic voltammetry and X-ray photo electron spectroscopy. For both thio derivatives the adsorption region is restricted due to the onset of reversible oxidization to 2,2 -bis(1H