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5. Calculate the overvoltage (in V) that is needed to sustain a current density of 20 mA-cm at a Pt| Fe, Fe clectrode at

5. Calculate the overvoltage (in V) that is needed to sustain a current density of 20 mA-cm at a Pt| Fe", Fe" clectrode at 25 C. Take jo = 2.5 x 10 A-cm and a = 0.58. (Hint: The overvoltage, n, is a very large positive value!]

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