کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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744481 | 894389 | 2007 | 8 صفحه PDF | دانلود رایگان |
Catalytic reaction mechanism and catalytic efficiency of electrochemical oxidation of dopamine on a poly(malachite green) film-coated glassy carbon electrode were investigated using cyclic voltammetry, bulk electrolysis, chronocoulometry, and chronoamperometry. Two electrons and two protons participated in the diffusion-controlled electrocatalytic oxidation of dopamine with a diffusion coefficient of 6.5 × 10−5 cm2 s−1 and a rate constant of 0.7 cm s−1. The rate-determining step of electrocatalytic oxidation of dopamine was the diffusion of dopamine inside the poly(malachite green) film. Catalytic efficiency as a quantitative parameter was proposed to demonstrate the catalytic ability of poly(malachite green) films towards dopamine and was expressed with the ratios of oxidation currents of dopamine on a poly(malachite green) film-coated glassy carbon electrode to those on a bare glassy carbon electrode. The catalytic efficiency of poly(malachite green) films towards dopamine to its thickness was estimated to be 1.11 mC−1. The effect of the concentration of dopamine, the thickness of poly(malachite green) films, and scan rates on catalytic efficiency was also studied.
Journal: Sensors and Actuators B: Chemical - Volume 128, Issue 1, 12 December 2007, Pages 83–90