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Electrocatalytic Oxidation of Nitrite at Gold Nanoparticle‐ polypyrrole Nanowire Modified Glassy Carbon Electrode
Author(s) -
Li Jing
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090011
Subject(s) - chemistry , chronoamperometry , nitrite , polypyrrole , cyclic voltammetry , differential pulse voltammetry , detection limit , electrode , charge transfer coefficient , inorganic chemistry , analytical chemistry (journal) , electrochemistry , organic chemistry , chromatography , nitrate
A novel chemically modified electrode based on the dispersion of gold nanoparticles on polypyrrole nanowires has been developed to investigate the oxidation behavior of nitrite using cyclic voltammetry, differential pulse voltammetry and chronoamperometry techniques. The diffusion coefficient ( D ), electron transfer coefficient ( α ) and charge transfer rate constant ( k ) for the oxidation of nitrite were determined. The modified electrode exhibited high electrocatalytic activity toward the oxidation of nitrite. The catalytic peak current was found to be linear with nitrite concentrations in the range of 8.0×10 −7 −2.5×10 −3 mol·L −1 with a detection limit of 1.0×10 −7 mol·L −1 ( s/n =3). The proposed method was successfully applied to the detection of nitrite in water samples with obtained satisfactory results. Additionally, the sensor also showed excellent sensitivity, anti‐interference ability, reproducibility and stability properties.