Adsorption Effects of Highly Polarizable Organic Compounds on Electrode Kinetics

Osamu Ikeda, Kenichi Watanabe, Yasuhiko Taniguchi, Hideo Tamura

Bulletin of the Chemical Society of Japan · 1984 · 40 citations · 13 references

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Abstract

Abstract Adsorption effects of ureas and thioureas on electrode kinetics were studied by using the electrode reactions of Zn2+/Zn(Hg) and Eu3+/Eu2+. The standard rate constant for Zn2+/Zn(Hg) is controlled by the inner-layer permittivity. The effect of this permittivity has been explained in terms of the solvent reorganization energy. The effect of the adsorbates on the electrode kinetics of Eu3+/Eu2+ cannot be explained in terms of the inner-layer permittivity. These two results suggest different locations for the formation of the activated complex: Inside the adsorption layer for Zn2+ and just outside layer for Eu3+.

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13