Generate a graph from the following data (using excel) and determine the following parameters from the...
Generate a graph from the following data (using excel) and determine the following parameters from the graph: exchange current, rate constant, charge transfer resistance and limiting current.
η(overpotential) (mV): -100, -120, -150, -500, -600
i (μA) : 45.9, 62.6, 100, 965, 965
Homework Answers
First we have to plot it.
By analyzing the equation y=-0.4771x - 89.929 we can determine
the exchange current by setting y=0. So we have i0 =
-188.49 uA. Rate constant is the slope : -0.477 mV/uA. The charge
transfer resistance is related this way: 
where F is Faraday's constant, R is the constant for gases, n is
the number of electrons involved and T the temperature. In this
case we find that 
. You have to complete with the missing values.
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