?A typical exchange-current density, that for \(\mathrm{H}^{+}\) discharge at platinum

Chapter 19, Problem E19D.5(a)

(choose chapter or problem)

A typical exchange-current density, that for \(\mathrm{H}^{+}\) discharge at platinum, is\(0.79 \mathrm{\ mA} \mathrm{\ cm}^{-2}\) at \(25^{\circ} \mathrm{C}\). Use the Butler–Volmer equation to calculate the current density at an electrode when its overpotential is (a) 10 mV, (b) 100 mV, (c) −5.0 V. Take \(\alpha=0.5\).

Text Transcription:

H^+

25^circ C

alpha=0.5

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