The Phenomenological Theory of an Elementary Act
Electrode processes are heterogeneous chemical reactions occurring at the electrode-electrolyte interface which involve a charge transfer through this interface. Such reactions naturally obey all the basic laws of chemical kinetics and, in particular, kinetics of heterogeneous reactions, but the charge transfer through the interface makes them a special case. This peculiarity leads to the dependence of the energy of the charge transfer process, and hence of its rate, on the electric potential difference between the two phases. Hence, in addition to the usual variables in chemical kinetics like concentration, temperature, etc., one more independent variable, namely the electrode potential, appears in the electrochemical kinetics. This quantity can be varied by polarizing an electrochemical cell with the help of an external power supply.
KeywordsActivation Energy Fermi Level Potential Drop Electrode Reaction Potential Energy Curve
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