Use the data in Table 25.6 in ATKINS for the exchange current density and transfer coefficient for the reaction: 2 H+ + 2e- → H2 on nickel at 25oC to determine what current density would be needed to obtain an overpotential of 0.20 V as calculated from

Appl Of Ms Excel In Analytical Chemistry

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Chapter12: Spectrochemical Methods

Section: Chapter Questions

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Question

Use the data in Table 25.6 in ATKINS for the exchange current density and transfer coefficient
for the reaction:

2 H+ + 2e- → H2

on nickel at 25oC to determine what current density would be needed to obtain an overpotential
of 0.20 V as calculated from:

(a) the Butler-Volmer equation
(b) the Tafel equation.

Is the validity of the Tafel approximation affected at overpotentials of 0.4 V and more?

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