Sirvi Kuupäev , alustades "2008-05-22T06:53:26Z" järgi

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Electroreduction of Complex Cations on Electrochemically Polished Bi(hkl) Single Crystal Electrodes
(2008-05-22T06:53:26Z) Härk, Eneli
Electroreduction of the cations has been suggested as a “model adiabatic outer-sphere” reaction and, therefore, it would give us the possibility to examine the influence of the electrical double-layer (edl) structure (i.e., dependence of edl and kinetics on the electrode material) on the electrochemical parameters for the electroreduction process at the Bi planes. The main aim of this work was to investigate the irreversible electroreduction reaction of cations at electrochemically polished single crystal plane electrodes in and weakly acidified (pH ~ 3.3) aqueous solutions. In the 0.01, … ,0.1 M solution the hydrogen evolution reaction starts at higher negative electrode potentials and the limiting diffusion current plateaus at higher rotation velocities and scan rates were not observed. It was found that the electroreduction of cations is limited mainly by the rate of the diffusion step in the region of the electrode potentials vs. SCE. Cathodic hydrogen evolution reaction (HER) from the acidic solutions has a noticeable influence on the kinetics of electroreduction reaction of the cations on electrochemically polished Bi planes. The present work also describes the influence of the crystallographic structure of the Bi single crystal plane electrodes on the charge transfer mechanism and kinetic parameters of electroreduction of the cations. The rotating disc electrode voltammetry, cyclic voltammetry and impedance spectroscopy methods have been used.