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Enhancement of Nitrite and Nitrate Electrocatalytic Reduction through the Employment of Self-Assembled Layers of Nickel- and Copper-Substituted Crown-Type Heteropolyanions
Dundalk Institute Technology, Ireland.
University of Padua, Italy.
University of Limerick, Ireland.
University of Limerick, Ireland.
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2015 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 31, no 8, 2584-2592 p.Article in journal (Refereed) Published
Abstract [en]

Multilayer assemblies of two crown-type type heteropolyanions (HPA), [Cu20Cl(OH)(24)(H2O)(12)(P8W48O184)](25-) and Ni-4(P8W48O148)(WO2)](28-), have been immobilized onto glassy carbon electrode surfaces via the layer-by-layer (LBL) technique employing polycathion-stabilized silver nanoparticles (AgNP) as the cationic layer within the resulting thin films characterized by electrochemical and physical methods. The redox behaviors of both HPA monitored during LBL assembly with cyclic voltammetry and impedance spectroscopy revealed significant changes by immobilization. The presence of AgNPs led to the retention of film porosity and electronic conductivity, which has been shown with impedance and voltammeric studies of film permeabilities toward reversible redox probes. The resulting films have been characterized by physical methods. Finally, the electrocatalytic performance of obtained films with respect to nitrite and nitrate electrocatalytic reduction has been comparatively studied for both catalysts. Nickel atoms trapped inside HPA exhibited a higher specific activity for reduction.

Place, publisher, year, edition, pages
American Chemical Society , 2015. Vol. 31, no 8, 2584-2592 p.
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-116952DOI: 10.1021/la503889jISI: 000350611300030PubMedID: 25644137OAI: diva2:802128

Funding Agencies|PRDSP Program (Institute of Technology Tallaght, Dublin, Ireland); Council of Directors TSR Program Strand 3; Dundalk Institute of Technology; CeNano grant (Linkoping University)

Available from: 2015-04-10 Created: 2015-04-10 Last updated: 2015-06-24

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