Charge transport through chemically modified electrodes: a general analysis for ion exchange and covalently attached redox polymers

Article Abstract:

Spatio-temporal flux equations were formulated, taking into account the influence of physical diffusion of the electroactive species on the mechanism of charge transport in chemically modified electrodes. The important role played by the physical displacement on parameters such as effective diffusion coefficient, steady-state current, conductivity, transport number and motility, among others, was demonstrated. The schematic variations of these parameters on fractional loading and applied potential were shown for bounded and free diffusion conditions. The qualitative influence of solvent medium on the apparent diffusion coefficient was pointed out.

Oxidation-reduction reaction, Oxidation-reduction reactions, Ion exchange

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Intermolecular energy transfer across nanocrystalline semiconductor surfaces

Article Abstract:

The yields and dynamics for energy transfer from the metal-to-ligand charge-transfer excited states of Ru(super 2+) across nanocrystalline TiO(sub 2) surfaces were quantified in various ambient media. Lateral energy transfer from Ru(super 2+*) to Os(super 2+) was observed and relaxation rates of Ru(super 2+)/TiO(sub 2) were described with a parallel first- and second order kinetic model to account for both unimolecular radiative and nonradiative decay and bimolecular excited-state reactions occurring at the surface.

Titanium dioxide

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Nonequilibrium thermodynamics formalism for charge transport in redox polymer electrodes

Article Abstract:

The competitive diffusion processes pertaining to charge transport through redox polymer electrodes is analyzed using Onsager's formalism of nonequilibrium thermodynamics. The reciprocity relations for electron hopping in the case of [Ru(NH3)(sub 6)](super 3+/2+) are validated.

Thermal properties, Thermodynamics

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