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Cinétique électrochimique du système Ti(IV)/Ti(III) dans différents milieux acides - Electroanalyse de Ti(IV)

Abstract : The kinetics of the Ti(IV)/Ti(III) couple in acid media was investigated. Experiments in square wave voltammetry performed at the mercury electrode with forward and reverse scans show a sequence of electrochemical reactions which occur in succession or even simultaneously. Complexes formed with HSO4- or C2O42- ligands react more rapidly than hydroxylated forms of titanyl ion. The experimental results were modelled and interpreted on the basis of CE and triangular reaction schemes where two Ti(IV) species bound by a slow chemical reaction reduce to Ti(III). The catalytic reduction of Ti(IV) in oxalate-chlorate media was also investigated. Experimental evidence that the catalytic current is affected by the kinetics of formation of the dioxalato Ti(IV) complex is given. The reaction pathway responsible for the catalytic effect was identified. An excellent agreement between theory and experiments was obtained. Finally, the optimal experimental conditions for analytical purposes were defined.
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  • HAL Id : tel-00163139, version 1

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Nathalie Larabi. Cinétique électrochimique du système Ti(IV)/Ti(III) dans différents milieux acides - Electroanalyse de Ti(IV). Autre. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00163139⟩

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