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Electrocatalytical Oxidation of Nitrite and Its Determination Based on Au@Fe 3 O 4 Nanoparticles
Author(s) -
Yu Chunmei,
Guo Jianwei,
Gu Haiying
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900465
Subject(s) - nitrite , detection limit , cyclic voltammetry , x ray photoelectron spectroscopy , dielectric spectroscopy , electrode , electrochemistry , analytical chemistry (journal) , materials science , inorganic chemistry , electron transfer , electrochemical gas sensor , electrolyte , scanning electron microscope , chemistry , chemical engineering , nitrate , chromatography , organic chemistry , engineering , composite material
A promising electrochemical nitrite sensor was fabricated by immobilizing Au@Fe 3 O 4 nanoparticles on the surface of L ‐cysteine modified glassy carbon electrode, which was characterized by scanning electron microscopy, X‐ray photoelectron spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The proposed sensor exhibited excellent electrocatalytic activity toward nitrite oxidation. The kinetic parameters of the electrode reaction process were calculated, (1– α ) n α was 0.38 and the heterogeneous electron transfer coefficient ( k ) was 0.13 cm s −1 . The detection conditions such as supporting electrolyte and pH value were optimized. Under the optimized conditions, the linear range for the determination of nitrite was 3.6×10 −6 to 1.0×10 −2 M with a detection limit of 8.2×10 −7 M ( S / N =3). Moreover, the as‐prepared electrode displayed good stability, repeatability and selectivity for promising practical applications.