کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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186614 | 459619 | 2013 | 7 صفحه PDF | دانلود رایگان |
We demonstrate, for the first time, the chemical/electrochemical synthesis of uniformly dispersed nickel hydroxide nanoparticles (NPs) embedded in a chitosan (CS) membrane deposited onto a glassy carbon (GC) electrode. The morphology of this composite was investigated by scanning electron microscopy (SEM). The SEM results show that NPs have nano-globular structure in the range 10–100 nm. This composite displays electrocatalytic activity toward oxidation of glucose in alkaline solution. The electrochemical properties of the resulting material deposited as a redox film have been investigated by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. Using Lavirin's theory, the electron-transfer rate constant and the transfer coefficient were determined to be ks = 4.1 s−1 and α = 0.42, respectively, for a modifier film (ΓNi = 7.1 × 10−10 mol cm−2) on a GC electrode in 0.1 M sodium hydroxide solution. The modified electrode for glucose oxidation is characterized by simple preparation, good stability, good reproducibility, and data from the amperometric current time curves recorded by holding the potential of the modified electrode at 0.75 V for 60 s for different glucose concentrations show a sensitivity of 72 μA mM−1 cm−2.
Journal: Electrochimica Acta - Volume 111, 30 November 2013, Pages 185–191