The Electrochemical Characteristics of Gold Electrode Modified by Thionine Covalently Bound to Self-assembled Cysteamine Monolayer and Its Electrocatalytic Oxidation for Ascorbic Acid

Abstract

Abstract: Agold electrode modified by thionine covalently bound to self-assembled cysteamine monolayer (Th-SAM) has been prepared.The electrochemical properties of this ThSAMmodified electrode was investigated by electrochemical methods.There were two redox couples when it was swept in the range of -0.45-+0.50 V(vs.SCE) by cyclic voltammetry.As to pH7.7, the peak potentials were E_pa¹＝214mV。E_pc¹＝82mV,E_pa²＝－75mV,E_pc²＝－160mV, respectively.The participating number of proton was 2 for peak 1 and 1 for peak 2 in the pHrange between 5.0 and 9.0.The surface electron transfer rate constant(k_s)of peak 2 was 0.02 s^-1.The Th-SAMmodified electrode could be successfully used for the electrocatalytic oxidation of ascorbic acid and the catalytic currents increased linearly with the ascorbic acid concentration in the range of 1.0 ×10^-6-4.0×10^-3 mol/L-The heteroge neous electron transfer rate constant was about 2.68×10^-3 cm/s.

Key words: Self-assembly, Electrocatalytic oxidation, Thionine, Chemically modified electrode, Ascorbic acid

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XU Jing-Juan, FANG Hui-Qun, CHEN Hong-Yuan. The Electrochemical Characteristics of Gold Electrode Modified by Thionine Covalently Bound to Self-assembled Cysteamine Monolayer and Its Electrocatalytic Oxidation for Ascorbic Acid[J]. Chem. J. Chinese Universities, 1997, 18(5): 706.

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The Electrochemical Characteristics of Gold Electrode Modified by Thionine Covalently Bound to Self-assembled Cysteamine Monolayer and Its Electrocatalytic Oxidation for Ascorbic Acid

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