Abstract
A modified electrode, nickel(II)-morin complex modified multi-wall carbon nanotube paste electrode (Ni(II)-MR-MWCNT-PE), has been fabricated by electrodepositing Ni(II)-MR complex on the surface of MWCNT-PE in alkaline solution. The Ni(II)-MR-MWCNT-PE exhibits the characteristic of improved reversibility and enhanced current responses of the Ni(III)/Ni(II) couple compared with Ni(II)-MR complex modified carbon paste electrode (CPE). It also shows better electrocatalytic activity toward the oxidation of hydroxylamine than the Ni(II) modified MWCNT-PE (Ni(II)-MWCNT-PE) and Ni(II)-MR-CPE. Kinetic parameters such as the electron transfer coefficient α, rate constant k s of the electrode reaction and the catalytic rate constant k cat of the catalytic reaction are determined. Moreover, the catalytic currents present linear dependence on the concentration of hydroxylamine from 2.5 × 10−6 to 4.0 × 10−4 mol L−1 by amperometry. The detection limit and sensitivity are 8.0 × 10−7 mol L−1 and 56.2 mA L mol−1, respectively. The modified electrode for hydroxylamine determination is of the property of simple preparation, good stability, fast response and high sensitivity.
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Acknowledgments
The authors acknowledge financial support from the National Natural Science Foundation of China (No. 20475043, No. 50874092) and the Science & Technology Innovation Foundation of Xi’an Shiyou University (No. Z09137).
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Zheng, L., Song, Jf. Electrocatalytic oxidation of hydroxylamine at Ni(II)-morin complex modified carbon nanotube paste electrode. J Appl Electrochem 41, 63–70 (2011). https://doi.org/10.1007/s10800-010-0207-6
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DOI: https://doi.org/10.1007/s10800-010-0207-6