The solvent friction mechanism for outer-sphere electron exchange at bare metal electrodes. The case of Au/Ru(NH3)(6)(3+)/(2+) redox system
Articolo
Data di Pubblicazione:
2003
Citazione:
The solvent friction mechanism for outer-sphere electron exchange at bare metal electrodes. The case of Au/Ru(NH3)(6)(3+)/(2+) redox system / D.E. Khoshtariya, T.D. Dolidze, A. Vertova, M. Longhi, S. Rondinini. - In: ELECTROCHEMISTRY COMMUNICATIONS. - ISSN 1388-2481. - 5:3(2003), pp. 241-245.
Abstract:
The heterogeneous rate constant for the Ru(NH3)63+/2+ electron exchange at the bare gold electrode displays a power-law dependence on the solution viscosity (varied by addition of glucose, 0–600 g/l) with a negative power index of d delta=1, indicative of the ‘‘full’’ solvent friction (adiabatic) mechanism for the intrinsic charge-transfer step. Comparison with related processes suggests that
this mechanism mainly occurs at bare metal electrodes irrespective of the reactants' charged state and the method of viscosity
variation. The adiabatic regime operates notwithstanding the presence of at least one layer of solvating water, and/or specifically
adsorbed ions, contributing to the charge-transfer distance.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
electron transfer mechanism; rutheniumhexaamine complex; rate constant; diffusion coefficient; viscosity effect; solvent control
Elenco autori:
D.E. Khoshtariya, T.D. Dolidze, A. Vertova, M. Longhi, S. Rondinini
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