Electrochemical Impedance of Ethanol Oxidation in Alkaline Media

被引：0
作者：
Danaee, Iman [2 ]
Jafarian, Majid [1 ]
Gobal, Fereydoon [3 ]
Sharafi, Mahboobeh [1 ]
Mahjani, Mohammad-ghasem [1 ]
机构：
[1] KN Toosi Univ Technol, Dept Chem, Tehran 158754416, Iran
[2] Petr Univ Technol, Abadan Fac Petr Engn, Abadan 63165619, Iran
[3] Sharif Univ Technol, Dept Chem, Tehran 113659516, Iran
来源：
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES | 2012年 / 28卷 / 01期
关键词：
Impedance; Equivalent circuit; Ethanol; Electrocatalytic; Nickel; GLASSY-CARBON ELECTRODE; FUEL-CELL; ELECTROCATALYTIC OXIDATION; GLUCOSE ELECTROOXIDATION; METHANOL OXIDATION; MASS-SPECTROMETRY; SPECTROSCOPY; MECHANISM; CATALYSTS; PLATINUM;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Nickel modified NiOOH electrodes were used for the electrocatalytic oxidation of ethanol in alkaline solutions. The electro-oxidation of ethanol in a 1 mol/L NaOH solution at different concentrations of ethanol was studied by ac impedance spectroscopy. Electrooxidation of ethanol on Ni shows negative resistance on impedance plots. The impedance shows different patterns at different applied anodic potential. The influence of the electrode potential on impedance was studied and a quantitative explanation for the impedance of ethanol oxidation was given by means of a proposed mathematical model. At potentials higher than 0.52 V(vs. Ag/AgCl), a pseudoinductive behavior was observed, but at those higher than 0.57 V, impedance patterns were reversed to the second and third quadrants. The conditions required for the reversing of impedance pattern were delineated with the impedance model.
引用
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页码：19 / 25
页数：7
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