Studies on the kinetics of ascorbate oxidation at a ruthenium oxide hexacyanoferrate modified electrode towards the detection at microenvironments

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• 作者：Thiago R.L.C. Paix&#xe3 ; o ; Mauro Bertotti
• 关键词：Ascorbate ; Microenvironment ; Ruthenium oxide hexacyanoferrate ; Microelectrode
• 刊名：Electrochemistry Communications
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：10
• 期：8
• 页码：1180-1183
• 全文大小：449 K

文摘

The electrocatalytic oxidation of ascorbate on a ruthenium oxide hexacyanoferrate (RuOHCF) glassy carbon (GC) modified electrode was investigated at pH 6.9 by using rotating disc electrode (RDE) voltammetry. The influence of the systematic variation of rotation rate, film thickness, ascorbate concentration and the electrode potential indicated that the rate of cross-chemical reaction between Ru(III) centres immobilized into the film and ascorbate controls the overall process. The kinetic regime may be classified as a Sk″ mechanism and the second order rate constant for the surface electrocatalytic reaction was found to be 1.56 × 10⁻³ mol⁻¹ L¹ s⁻¹ cm. A carbon fibre microelectrode modified with the RuOHCF film was successfully used as an amperometric sensor to monitor the ascorbate diffusion in a simulated microenvironment experiment.