Title of article :
Preparation, electrochemical behavior and electrocatalytic activity of chlorogenic acid multi-wall carbon nanotubes as a hydroxylamine sensor
Author/Authors :
Zare، نويسنده , , Hamid R. and Nasirizadeh، نويسنده , , Navid and Ajamain، نويسنده , , Hamideh and Sahragard، نويسنده , , Ali، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
8
From page :
975
To page :
982
Abstract :
Electrochemical characteristics of an electrodeposited chlorogenic acid film on multi-wall carbon nanotubes glassy carbon electrode (CGA–MWCNT–GCE) and its role as a sensor for electrocatalytic oxidation of hydroxylamine are described. Cyclic voltammograms of the CGA–MWCNT–GCE indicate a pair of well-defined and nearly reversible redox couple with the surface confined characteristics at a wide pH range of 2.0–12.0. The charge transfer coefficient, α, and the charge transfer rate constant, ks, of CGA adsorbed on MWCNT were calculated 0.48 and 44 ± 2 s−1 respectively. The CGA–MWCNT–GCE shows a dramatic increase in the peak current and/or a decrease in the overvoltage of hydroxylamine electrooxidation in comparison with that seen at a CGA modified GCE, MWCNT modified GCE and activated GCE. The kinetic parameters of electron transfer coefficient, α, the heterogeneous electron transfer rate constant, k′, and exchange current, i0, for oxidation of hydroxylamine at the modified electrode surface were determined using cyclic voltammetry. Four linear calibration ranges and high repeatability with relative standard deviation of 4.6%, for a series of four successive measurements in 17.7 μM hydroxylamine, are obtained at the CGA–MWCNT–GCE using an amperometric method. Finally, the modified electrode was successfully used for determination of spiked hydroxylamine in two water samples.
Keywords :
hydroxylamine , Rate constant , Sensor , Electrocatalytic oxidation , multi-wall carbon nanotubes , Chlorogenic acid
Journal title :
Materials Science and Engineering C
Serial Year :
2011
Journal title :
Materials Science and Engineering C
Record number :
2101333
Link To Document :
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