Skip to Main content Skip to Navigation
Journal articles

Electrochemical activity of various types of aqueous In(III) species at a mercury electrode

Abstract : An interpretation framework is presented which provides a straightforward means to characterise the electrochemical reactivity of aqueous ions together with their various hydrolysed counterparts. Our novel approach bypasses the more laborious strategy of solving rigorously, for all relevant species, the complete set of Butler-Volmer equations coupled to diffusion differential equations. Specifically, we consider the spatial variable via a Koutecký-Koryta type of differentiation between nonlabile and labile zones adjacent to the electrode. The theory is illustrated by an assessment of the electrochemical reactivity of aqueous In(III) species based upon proper comparison between relevant time scales of the involved interfacial processes, i.e. diffusion, (de)protonation of inner-sphere water, dissociation/release of H 2 O and OH − , and electron transfer. The analysis reveals that whilst all In(III) species are labile on the experimental timescale with respect to (de)protonation and (de)hydration, there are large differences in the rates of electron transfer between In H 2 O ð Þ 3þ 6 and the various hydroxy species. Specifically, in the case of In H 2 O ð Þ 3þ 6 , the rate of electron transfer is so slow that it replaces the traditional Eigen rate-limiting water release step in the overall passage from hydrated In 3+ to its reduced metallic form; in contrast, the In(III) hydroxy species display electrochemically reversible behaviour.
Document type :
Journal articles
Complete list of metadatas

Cited literature [69 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/hal-02941348
Contributor : Jerome Duval <>
Submitted on : Thursday, September 24, 2020 - 9:08:26 AM
Last modification on : Saturday, October 17, 2020 - 7:16:04 PM

File

JSEL_D2000228_R1.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Raewyn Town, Jérôme Duval, Herman van Leeuwen. Electrochemical activity of various types of aqueous In(III) species at a mercury electrode. Journal of Solid State Electrochemistry, Springer Verlag, 2020, ⟨10.1007/s10008-020-04607-0⟩. ⟨hal-02941348⟩

Share

Metrics

Record views

14

Files downloads

39