Experimental Data on the Exchange Current Density and Symmetry Coefficient

9 EXPERIMENTAL DATA ON THE EXCHANGE CURRENT DENSITY AND SYMMETRY COEFFICIENT 

Experimental Values of Exchange Current Density, Standard Exchange Current Density and Symmetry Coefficient 

Source Adapted from Hamann, C.H. et al., Electrochemistry, 2nd edn., Wiley-VCH, Weinheim, Germany, 2007. 

In Table 6.1, the standard value of the exchange current density, jl, can be defined using the following equation  

The standard exchange current density (y ) is defined as the exchange current density when molar concentrations of both Ox (Cqx) and Red (CRe j) equal 1 mol L . To experimentally obtain jl, should be measured as a function of Cqx and CRe j. and then an extrapolation should be made to Cqx = CRed = 1 mol L . The effect of the activity coefficients is completely ignored in using Equation 6.9 but could be a problem if high concentrated solutions are considered. The derivation of Equation 6.9 can be found in the literature [2,4], 

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