Electrochemical behaviour of self-assembly multilayer films based on iron-substituted alpha-Keggin polyoxotungstates

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abstract

Ultrathin multilayer films containing metal-substituted polyoxometalates, [PW(1) (t)Fe(III)(H(2)O)O(39)](4-) (PW(11)Fe) or [siW(11)Fe(III)(H(2)O)O(39)](5-) (SiW(11)Fe), and poly(ethylenimine) (PEI) were prepared by the electrostatic layer-by-layer self-assembly method on a glassy carbon electrode. The multilayer films were characterized by cyclic voltammetty and scanning electron microscopy and UV-Vis absorption spectroscopy on a quartz slide was used to monitor film growth Cyclic voltammetry indicates that the electrochemical properties of the polyoxometalates are completely maintained in the multilayer films, and the influence of scan rate on the voltammetric features showed that the first tungsten reduction process for immobilized PW(11)Fe and SAW, IFe is a surface-confined process Studies with [Fe(CN(6))](3-/4-) as electrochemical probe showed that their permeability depends on the thickness of the multilayer films, if the outermost layer is negatively charged. Additionally, the (PEI/SiW(11)Fe)(n) multilayer films showed electrocatalytic properties towards nitrite reduction. (C) 2010 Elsevier B.V. All rights reserved

keywords

GLASSY-CARBON ELECTRODE; LAYERED POLYELECTROLYTE FILMS; TRANSITION-METAL; ELECTROCATALYTIC REDUCTION; HOMOGENEOUS CATALYSIS; ULTRATHIN FILMS; POLYOXOMETALATE; POLYMER; NITRITE; HETEROPOLYTUNGSTATES

subject category

Materials Science; Physics

authors

Fernandes, DM; Carapuca, HM; Brett, CMA; Cavaleiro, AMV

our authors

foto Ana Maria Vieira Silva Viana Cavaleiro

Ana Maria Vieira Silva Viana Cavaleiro

Full professor

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acknowledgements

The authors thank Fundacao para a Ciencia e a Tecnologia (FCT) for financial support (project POCI 2010-Feder-POCI/QUI/56534/2004). Diana M. Fernandes acknowledges FCT for her PhD grant SFRH/BD/30797/2006. Thanks are also due to CICECO and the University of Aveiro

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Publication Details

type
Journal Article
year
2010
journal
THIN SOLID FILMS
volume
518
publisher
ELSEVIER SCIENCE SA
issn
0040-6090
issue
21
digital object identifier
10.1016/j.tsf.2010.05.065
web of science article identifier
WOS:000280989100001

Journal Metrics (JCR 2019)

Journal Impact Factor
2.03
Journal Impact Factor (5 yrs)
1.884
category normalized journal percentile
42.934

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