期刊
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
卷 20, 期 1, 页码 141-151出版社
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532009000100022
关键词
carbohydrates; electrocatalysis; cobalt hydroxide; modified electrode
This study investigated the electrocatalytic oxidation of fructose, sucrose, glucose, lactose, arabinose and maltose on nanoparticles of cobalt hydroxide electrodeposited on the surface of glassy carbon electrode in alkaline solutions. Cyclic voltammetry (CV), chronoamperometry (CA) techniques and also steady state polarization measurements have been employed. In CV studies, in the presence of carbohydrate the increase of the peak current of the oxidation of cobalt hydroxide is followed by a decrease in the corresponding cathodic current. This indicates that carbohydrates were oxidized by the redox mediator which was immobilized on the electrode surface via an electrocatalytic mechanism. With the use of Laviron's equation, the values of anodic and cathodic electron-transfer coefficients and charge transfer rate constant for the immobilized redox species were determinated as 0.71 +/- 0.03, 0.33 +/- 0.03 and 0.21 +/- 0.02 s(-1), respectively. The rate constant, the electron transfer coefficient and the diffusion coefficients involved in the electrocatalytic oxidation of carbohydrates were determined.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据