Electrochemical Behaviour of PSS-Functionalized Silica Films Prepared by Electroassisted Deposition of Sol–Gel Precursors

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Title: Electrochemical Behaviour of PSS-Functionalized Silica Films Prepared by Electroassisted Deposition of Sol–Gel Precursors
Authors: Gamero Quijano, Daniel Alonso | Huerta Arráez, Francisco | Salinas Torres, David | Morallon, Emilia | Montilla, Francisco
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Electrochemical sensors | Electroassisted deposition | Dopamine | Naphthoquinone | Molecular transport
Knowledge Area: Química Física
Issue Date: Jan-2015
Publisher: Springer Science+Business Media New York
Citation: Electrocatalysis. 2015, 6(1): 33-41. doi:10.1007/s12678-014-0215-0
Abstract: Porous, electrically insulating SiO2 layers containing polystyrene sulfonate (PSS) were deposited on glassy carbon electrodes by an electrochemically assisted deposition method. The obtained material was characterized by microscopic, spectroscopic and thermal techniques. Silica-PSS films modify the electrochemical response of the glassy carbon electrodes against selected redox probes. Positively charged species show reduced diffusivities across the SiO2-PSS pores, which resulted in a concentration ratio higher than 1 for these species. The opposite behaviour was found for negatively charged redox probes. These observations can be interpreted in terms of the different affinity of the GC/SiO2-PSS-modified electrode for the electroactive species, as a consequence of the negatively charged porous silica.
Sponsor: Financial support from the Spanish Ministerio de Economía y Competitividad and FEDER (MAT2010-15273) and Fundación Ramón Areces is gratefully acknowledged. Financial support from the Generalitat Valenciana is acknowledged (PROMETEO2013/038). A.G.Q. thanks go to Generalitat Valenciana for a Santiago Grisolia grant. D.S.T. thanks Spanish Ministerio de Economía y Competitividad for an FPI grant (BES-2010-035238).
URI: http://hdl.handle.net/10045/53149
ISSN: 1868-2529 (Print) | 1868-5994 (Online)
DOI: 10.1007/s12678-014-0215-0
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Springer Science+Business Media New York 2014. The final publication is available at Springer via http://dx.doi.org/10.1007/s12678-014-0215-0
Peer Review: si
Publisher version: http://dx.doi.org/10.1007/s12678-014-0215-0
Appears in Collections:INV - GEPE - Artículos de Revistas

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