The Influence of Protonation on the Electroreduction of Bi (III) Ions in Chlorates (VII) Solutions of Different Water Activity
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Data
2015-02-24Autor
Nosal-Wiercińska, Agnieszka
Grochowski, Mariusz
Wiśniewska, Małgorzata
Tyszczuk-Rotko, Katarzyna
Skrzypek, Slawomira
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We examined the electroreduction of Bi (III) ions in
chlorate (VII) solutions under varied protonation conditions of
the depolariser using voltammetric and impedance methods.
The results of the kinetic parameter correlation lead to the
statement that the changes in the amount of chloric (VII) acid
against the amount of its sodium salt in the supporting electrolytes
of the low water activity have a significant influence
on the rate of Bi (III) ion electroreduction. The increase of the
concentration of chloric acid sodium salt, aswell as the chloric
(VII) acid alone within the particular concentration of the
supporting electrolyte, inhibits the process of Bi (III) ion
electroreduction. It should be associated with the
reorganisation of the structure of the double layer connected
with the slow dehydration inhibited by ClO 4
− ions. The standard
rate constants ks values with the increase of the chlorate
(VII) concentrations for all the solutions examined of chlorates
(VII) confirms the catalytic influence of the decrease of
water activity on the process of Bi (III) ion electroreduction.
The multistage process is confirmed by the non-rectilinear
1nkf=f(E) dependences.
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