کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
188239 459656 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation, characterization and redox reactivity of glassy carbon electrode modified with organometallic complex of nickel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Preparation, characterization and redox reactivity of glassy carbon electrode modified with organometallic complex of nickel
چکیده انگلیسی

The organometallic complex of nickel (S)-[O-[(N-benzylpropyl)amino](phenyl)methyleneiminoacetate(2-)-N,N′,N″-nickel(II), labeled Ni-(S)BPB-Gly, irreversibly adsorbed on a glassy carbon electrode, displays electrocatalytic activity toward the oxidation of methanol in alkaline solution. Electrochemical properties of the resulting material deposited as a redox film have been investigated by cyclic voltammetry. Using Laviron's theory, the electron-transfer rate constant and the transfer coefficient were determined to be k = 1.94 s−1 and α = 0.5, respectively, for a poly-Ni-(S)BPB-Gly film (ΓNi = 9 × 10−10 mol cm−2) on a glassy carbon electrode in 0.1 M sodium hydroxide solution. Chronoamperometric studies were also used to determine the catalytic rate constant for the catalytic reaction of the tested modifier with methanol (kcat = 0.33 × 105 cm3 mol−1 s−1). The dependence of the methanol oxidation current on the alcohol concentration and on the number of redox centers Ni(II)/Ni(III) is discussed. From the fact that the oxidation current increases with an increase of film thickness it is evident that the electrocatalytic reaction occurs inside the tested film. The system examined is a typical example of a redox layer with 3D properties. The modified electrode for methanol oxidation is characterized by simple preparation, good stability and good reproducibility.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 76, 1 August 2012, Pages 462–467
نویسندگان
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