期刊
ELECTROCHIMICA ACTA
卷 56, 期 3, 页码 1030-1036出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.10.058
关键词
ZnO; MWCNTs; Gold nanoparticles; Nitrite oxidation; Electrocatalysis
资金
- National Natural Science Foundation of China [20973114]
A novel composite electrode of Au/ZnO/MWCNTs/GC has been constructed for the electrochemical detection of nitrite, where ZnO thin film and Au nanoparticles are electrodeposited through layer-by-layer onto MWCNTs/GC substrate. The resulting electrode is characterized by scanning electron microscopy and energy-dispersed X-ray spectroscopy. Its electrocatalytic activity toward the electro-oxidation of nitrite has been examined and compared to various modified electrodes. including MWCNTs/GC, Au/ZnO/GC. Au/MWCNTs/GC, and ZnO/MWCNTs/GC via cyclic voltammetry. The electrodeposition time for ZnO and the Au loading amount together with the solution pH are investigated to achieve optimal conditions for the electrode fabrication and nitrite detection. Linear relationship between current response and nitrite concentration is observed in the range from 7.8 x 10(-7) to 4.0 x 10(-4) M and the limit of the detection is 4.0 x 10(-7) M (S/N = 3). The influence of various anions and cations on the nitrite detection has been studied. The proposed method is also employed for the determination of nitrite in real samples. (C) 2010 Elsevier Ltd. All rights reserved.
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