To a first approximation, significant evolution or deposition occurs in electrolysis only if the overpotential exceeds about
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To a first approximation, significant evolution or deposition occurs in electrolysis only if the overpotential exceeds about 0.6 V. To illustrate this criterion determine the effect that increasing the overpotential from 0.40 V to 0.60 V has on the current density in the electrolysis of 1.0 M NaOH(aq), which is 1.0 mA cm−2 at 0.4 V and 25°C. Take α = 0.5.
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