2,3~7o,e 2,3r/o,a bulk concentration diffusion coefficient Faraday constant exp (r?/~7o,c) -exp (-r?/r~o,~) exp (r//~7o,e) exp ( r~/~o,a) exchange current density current density limiting current density limiting current density under spherical diffusion control number of electrons number of nuclei (cm 2) radius of growing nucleus radius of critical nucleus radius of growing nucleus at which de...

Oxygen reduction on the surface of a rotating disk electrode RDE in 0.5 M H2SO4 is simulated by including mass transfer, adsorption, and charge transfer. A generalized model for the adsorption and reaction of several species is introduced. The oxygen reduction reaction is simulated as a limiting case where oxygen is the only species adsorbed, and oxygen reduction is the only reaction that takes...

An electrochemical cell and electrode system for investigation of aqueous systems under nearand supercritical conditions is described. Cyclic voltammetry of 1.5% w/w KC1 and 6% w/w KBr solutions was investigated and log current vs. potential (Tafel) plots for the chlorine and hydrogen evolution reactions are given. A study of the Cu/Cu(I)/Cu(II) system in Na2S04 and KC1 solutions is described a...

Interfacial charge transfer is widely assumed to obey the Butler-Volmer kinetics. For certain liquid-solid interfaces, the Marcus-Hush-Chidsey theory is more accurate and predictive, but it has not been applied to porous electrodes. Here we report a simple method to extract the charge transfer rates in carbon-coated LiFePO4 porous electrodes from chronoamperometry experiments, obtaining curved ...

The corrosion inhibition of AISI309 austenitic stainless steel by 2,2'-Bipyridyl in 0.5M H 2 SO 4 at 298K was studied using the mass loss’ method, the potentiodynamic polarization (Tafel), the linear polarization (LRP) and the electrochemical impedance spectroscopy (EIS). The results showed a mixed inhibition mode and an increase in the charge transfer resistance, due to inhibitor molecules’ ad...

Based on the Volmer-Heyrovsky-Tafel mechanism, Frumkin adsorption and thermodynamic data of hydrogen (deuterium) absorption in Pd, effects of surface parameters on the hydrogen (deuterium) loading ratio into Pd in the hydrogen (deuterium) evolution reaction are discussed. There is a change of mechanism from the Volmer-Tafel route to the Volmer-Heyrovsky route when the current density rises, and...