Layer-by-layer self-assembly and electrocatalytic properties of poly(ethylenimine)-silicotungstate multilayer composite films
authors Fernandes, DM; Brett, CMA; Cavaleiro, AMV
nationality International
journal JOURNAL OF SOLID STATE ELECTROCHEMISTRY
author keywords Keggin-type silicotungstates; Polyoxometalates; Glassy carbon-modified electrodes; Layer-by-layer (LBL) self-assembly
keywords GLASSY-CARBON ELECTRODES; KEGGIN-TYPE; ELECTROCHEMICAL-BEHAVIOR; POLYELECTROLYTE FILMS; TRANSITION-METAL; HOMOGENEOUS CATALYSIS; PASTE ELECTRODE; POLYOXOMETALATE; POLYOXOTUNGSTATES; SURFACES
abstract Hybrid multilayer films composed of poly(ethylenimine) and the Keggin-type polyoxometalates were prepared on glassy carbon electrodes by layer-by-layer self-assembly, and were characterized by cyclic voltammetry and scanning electron microscopy. UV-vis absorption spectroscopy of films deposited on quartz slides was used to monitor film growth, showing that the absorbance values at characteristic wavelengths of the multilayer films increase almost linearly with the number of bilayers. Cyclic voltammetry indicates that the electrochemical properties of the polyoxometalates are maintained in the multilayer films, and that the first tungsten reduction process for immobilized SiW11 and SiW11Co is a surface-confined process. Electron transfer to as electrochemical probes was also investigated by cyclic voltammetry. The (PEI/SiW11Co)(n) multilayer films showed excellent electrocatalytic reduction properties towards nitrite, bromate and iodate.
publisher SPRINGER
issn 1432-8488
year published 2011
volume 15
issue 4
beginning page 811
ending page 819
digital object identifier (doi) 10.1007/s10008-010-1154-1
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000289213200022
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journal impact factor (jcr 2016): 2.316
5 year journal impact factor (jcr 2016): 2.250
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