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Kinetics of the ferro—ferricyanide electron transfer reaction on anodically formed tin oxide

✍ Scribed by I.A. Ammar; S.A. Darwish; M.W. Khalil; S. El-Taher

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
613 KB
Volume
33
Category
Article
ISSN
0013-4686

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✦ Synopsis

The kinetics of electron transfer reaction across a layer of tin oxide formed on tin electrodes were measured in borate buffer pH = 8. The effect of concentration ofthe redox system, Fe(CN)z /Fe(CN)d _ , on the rate of the process and also the effect of oxide thickness were measured by cathodic and anodic polarization curves. A reaction order of 0.7 with respect to the redox system was found. An exponential dependence of the exchange c.d, i. , on film thickness was interpreted on the basis of direct tunnelling through the oxide. Thick films formed at potentials within the Or-evolution range showed increase of i0 as function of film thickness.

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