?In an experiment on the \(\mathrm{Pt}\left

Chapter 19, Problem P19D.1

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In an experiment on the \(\mathrm{Pt}\left|\mathrm{H}_{2}\right| \mathrm{H}^{+}\) electrode in dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) the following current densities were observed at \(25^{\circ} \mathrm{C}\). (a) Evaluate \(\alpha\) and \(j_{0}\) for the electrode.

\(\begin{array}{lccccc}\eta / \mathrm{mV} & 50 & 100 & 150 & 200 & 250 \\j /\left(\mathrm{mA} \mathrm{cm}^{-2}\right) & 2.66 & 8.91 & 29.9 & 100 & 335\end{array}\)

(b) For the same electrode, draw up a table of current densities for the case where the overpotentials have the same magnitude, but are of opposite sign, to those given above.

Text Transcription:

Pt |H_2 | H^+

H_2 SO_4

25^circ C

alpha

j_0

eta/mV & 50 & 100 & 150 & 200 & 250 over j/(mA cm^-2) & 2.66 & 8.91 & 29.9 & 100 & 335

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