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Electrochemical Characterisation of Ni II ‐Crown‐Type Polyoxometalate‐Doped Polypyrrole Films for the Catalytic Reduction of Bromate in Water
Author(s) -
Ali Bushra,
Laffir Fathima,
Kailas Lekshmi,
Armstrong Gordon,
Kailas Lekshmi,
O'Connell Robbie,
McCormac Timothy
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801106
Subject(s) - bromate , polyoxometalate , polypyrrole , chemistry , dielectric spectroscopy , electrochemistry , inorganic chemistry , catalysis , x ray photoelectron spectroscopy , redox , conductive polymer , scanning electron microscope , polymer , chemical engineering , electrode , materials science , organic chemistry , bromide , engineering , composite material
The nickel substituted (Ni 4 [(P 8 W 48 O 184 )(WO 2 )] 28– , crown type polyoxometalate was electrochemically polymerised with conducting polymer pyrrole for the electrocatalytic reduction of bromate in water. The immobilized films of different thickness were characterised by electrochemical and surface based techniques. The resulting films were found to be extremely stable towards redox switching between the various redox states associated with the incorporated POM. This system was found to effectively electrocatalyse the reduction of bromate in water without the interference of other common anions. The detection limit was found to be 0.2 µ m , with a linear region from 0.1 m m up to 2 m m bromate. The resulting POM doped polypyrrole films were found to be highly conductive by AC impedance. Surface characterization of the polymer films was carried out by using X‐ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy.