NDLI: Adsorption of thallium cations on RuO$_{2}$–TiO$

Content Provider	SpringerLink
Author	Ferro, S. Donatoni, M. Battisti, A. Andreev, V. N.
Copyright Year	2007
Abstract	The electrochemical ion-exchange properties of RuO$_{2}$–TiO$_{2}$ film electrodes with different composition have been studied in acidic and alkaline media. Thallium-cation uptake has been observed only from the latter and its extent was found to be a function of electrode potential and composition. At potentials near 0.0 V (RHE), the amount of adsorbed Tl$^{+}$ exhibited a maximum, and decreased with increasing potential, reaching a broad minimum in the range 0.4–0.8 V. A further increase in the electrode potential, above about 1.0 V, led to an increase of adsorbed thallium species, essentially due to deposition of a few layers of Tl(III) hydroxide. In fact, the release of the latter species was found to be much slower than that of thallium ions adsorbed at 0.0 V. For the latter, in turn, the double injection/ejection mechanism, currently accepted to explain the charge-storage in oxide electrodes, seems to be confirmed. The high Γ values attained at 0.0 V indicate that the large ionic radius of Tl$^{+}$ does not prevent its diffusion through the thinner pore texture of the oxide coatings, possibly because of its poor hydration, related with lower charge density at the ion surfaces.
Starting Page	1389
Ending Page	1394
Page Count	6
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	37
Issue Number	11
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-25
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Thallium ion Adsorption Ruthenium oxide Titanium oxide Coatings Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry Materials Chemistry Chemical Engineering

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