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Half-wave potential as affected by supporting electrolyte nature:Interplay of adsorption and ionic association for electroreductionof V(V)-mixed addenda Keggin tungstophosphateстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 13 марта 2014 г.
- Авторы: Pugolovkin L.V., Naumova M.A., Fedorova A.A., Borzenko M.I., Tsirlina G.A.
- Журнал: Electrochimica Acta
- Том: 111
- Год издания: 2013
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 292
- Последняя страница: 298
- DOI: 10.1016/j.electacta.2013.08.067
- Аннотация: V(V)-mixed addenda Keggin tungstophosphate demonstrates the pronounced dependence of polarographic half-wave potential E1/2at positively charged mercury surface on the nature of supporting alkali metal cation. This effect (typical for polyoxometalates) complicates the straightforward application ofE1/2values to analysis of various thermodynamic trends and correlations. Cation-induced E1/2 shifts are explained under assumption of Keggin anions reduction from compact adlayers containing the cations. Strong adsorption of the reactant is confirmed by a decrease of interfacial surface tension and by pronounced inhibitory effect on the outer-sphere electron transfer reactions. Stabilization of adlayers by co-adsorbing supporting cations increases in a series Li+< Na +< K+, as follows from surface tension measurements and inhibition of peroxodisulfate reduction. The effect of cations on electrochemical behavior of non-mixed addenda Keggin tungstophosphate is discussed for comparison. © 2013 Elsevier Ltd.
- Добавил в систему: Борзенко Марина Игоревна