Electrochemical behaviour of different redox probes on single wall carbon nanotube buckypaper-modified electrodes

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Title: Electrochemical behaviour of different redox probes on single wall carbon nanotube buckypaper-modified electrodes
Authors: Sieben, Juan Manuel | Ansón Casaos, Alejandro | Montilla, Francisco | Martínez Fernández de Landa, María Teresa | Morallon, Emilia
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: Single-walled carbon nanotubes | Buckypaper | Electrochemical properties | Redox probes
Knowledge Area: Química Física
Issue Date: 20-Jul-2014
Publisher: Elsevier
Citation: Electrochimica Acta. 2014, 135: 404-411. doi:10.1016/j.electacta.2014.05.016
Abstract: In the present work, the electrochemical properties of single-walled carbon nanotube buckypapers (BPs) were examined in terms of carbon nanotubes nature and preparation conditions. The performance of the different free-standing single wall carbon nanotube sheets was evaluated via cyclic voltammetry of several redox probes in aqueous electrolyte. Significant differences are observed in the electron transfer kinetics of the buckypaper-modified electrodes for both the outer- and inner-sphere redox systems. These differences can be ascribed to the nature of the carbon nanotubes (nanotube diameter, chirality and aspect ratio), surface oxidation degree and type of functionalities. In the case of dopamine, ferrocene/ferrocenium, and quinone/hydroquinone redox systems the voltammetric response should be thought as a complex contribution of different tips and sidewall domains which act as mediators for the electron transfer between the adsorbate species and the molecules in solution. In the other redox systems only nanotube ends are active sites for the electron transfer. It is also interesting to point out that a higher electroactive surface area not always lead to an improvement in the electron transfer rate of various redox systems. In addition, the current densities produced by the redox reactions studied here are high enough to ensure a proper electrochemical signal, which enables the use of BPs in sensing devices.
Sponsor: J.M.S. thanks Ministerio de Educación (SB2010-132). Financial support from MINECO (MAT2010-15273, TEC2010-15736 and PRI-PIBAR-2011-1 projects), GV (PROMETEO2013/038 project) and and the Government of Aragon (DGA) and the European Social Fund (ESF) under Project DGA-ESF-T66 CNN is acknowledged.
URI: http://hdl.handle.net/10045/46338
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2014.05.016
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.electacta.2014.05.016
Appears in Collections:INV - GEPE - Artículos de Revistas

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