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Steady-state Current Overpotential Behaviour

1 Steady-state Current Overpotential Behaviour - For a simple single charge-transfer process equation (2.28) describes the closed-circuit behaviour. At low overpotentials, the current and overpotential are linearly related and the exchange current density can be evaluated from the gradient (see equation [Pg.29]


In general it will be necessary to measure via impedance measurements using a four electrode cell. A schematic diagram of the cell which would be used for such measurements is shown in Fig. 10.15. The expected behaviour will be as described in Eqn (10.3) except that Warburg impedances can arise from either or both phases. An example of an impedance spectrum of the H2O/PVC interface is shown in Fig. 10.16. The application of a constant overpotential will, in general, lead to a slowly decaying current with time due to the concentration changes which occur in both phases, so that steady state current potential measurements will be of limited use. [Pg.289]


See other pages where Steady-state Current Overpotential Behaviour is mentioned: [Pg.12]    [Pg.30]    [Pg.12]    [Pg.29]    [Pg.30]    [Pg.12]    [Pg.30]    [Pg.12]    [Pg.29]    [Pg.30]    [Pg.251]    [Pg.386]    [Pg.44]    [Pg.158]    [Pg.370]   


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