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Multilayer Assemblies Consisting of Tri‐Vanadium‐Substituted Heteropolyanions and Its Electrocatalytic Properties
Author(s) -
Zhai Shengyong,
Liu Jianyun,
Jiang Junguang,
Dong ShaoJun
Publication year - 2003
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.200390142
Subject(s) - ascorbic acid , overpotential , cyclic voltammetry , vanadium , electrochemistry , redox , catalysis , cationic polymerization , electrocatalyst , materials science , inorganic chemistry , electrode , chemistry , nuclear chemistry , polymer chemistry , organic chemistry , food science
Abstract We describe the controlled fabrication of ultrathin multilayer films consisting of tri‐vanadium‐ substituted heteropolytungstate anions (denoted as P 2 W 15 V 3 ) and a cationic polymer of quaternized poly (4‐vinylpyridine) partially complexed with osmium bis(2,2′‐bipyridine) (denoted as QPVP‐Os) on the 4‐aminobenzoic acid (4‐ABA) modified glassy carbon electrode (GCE) surface based on layer‐by‐layer assembly. Cyclic voltammetry and UV‐vis absorption spectrometry have been used to easily monitor the thickness and uniformity of thus‐formed multilayer films. The V‐centered redox reaction of P 2 W 15 V 3 in the multilayer films can effectively catalyze the reduction of BrO $\rm{ {_{3}^{-}}}$ and NO $\rm{ {_{2}^{-}}}$ . The resulting P 2 W 15 V 3 /QPVP‐Os multilayer film modified electrode behaves as a much promising electrochemical sensor because of the low overpotential for the catalytic reduction of BrO $\rm{ {_{3}^{-}}}$ and NO $\rm{ {_{2}^{-}}}$ , and the catalytic oxidation of ascorbic acid.