Title: Attempts to immobilize catalytically active substituted-heteropolytungstates in multilayer film of charged polyelectrolyte poly(allylamine hydrochloride)
Authors: Ammam, Malika ×
Keita, Bineta
Nadjo, Louis
Mbomekalle, Israel-Martyr
Fransaer, Jan #
Issue Date: Jul-2010
Publisher: Elsevier Science SA
Series Title: Journal of Electroanalytical Chemistry vol:645 issue:2 pages:65-73
Abstract: A series of transition metal substituted polyoxometalates (POMs) have been attached to carbon electrodes in multilayer films of poly(allylamine hydrochloride) (PAH). These include Wells-Dawson-derived sandwich-type Fe-4(III)(H2O)(2)(As2W15O56)(2)(12-)center dot CO4II(H2O)(2)(As2W15O56)(2)(16-) and Mn-4(II)(H2O)(2)(As2W15O56)(2)(16-) and Wells-Dawson mono-substituted-type alpha(1)-[(P2W17VO62)-O-IV](8-) and alpha(2)-[P2W17O61(OH)(2)Fe-III](7-). The modified electrodes were characterized by cyclic voltammetry and UV-Vis spectroscopy. The experimental observations indicate the degradation of the substituted-POMs during their incorporation in the PAH multilayer film, probably as a result of electrostatic repulsions between the positively-charged metal cation substitute (Fe-III Mn-II or V-IV) of the POM and the positively-charged PAH. The degradation mostly results in the formation of lacunary-type POMs. Although the encapsulation does not lead to the entire preservation of the substituted-POMs, the substituted-POMs/PAH films can be used as pH sensors and as efficient electrocatalysts for the reduction of dioxygen, hydrogen peroxide and the oxidation of the NADH coenzyme. (C) 2010 Elsevier B.V. All rights reserved.
ISSN: 1572-6657
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemical and Extractive Metallurgy Section (-)
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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