Snowden, Michael E., Edwards, Martin A., Rudd, Nicola C., Macpherson, Julie V. and Unwin, Patrick R. (2013) Intrinsic electrochemical activity of single walled carbon nanotube–Nafion assemblies. Physical Chemistry Chemical Physics, Volume 15 (Number 14). pp. 5030-5038. doi:10.1039/c3cp44538k

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Abstract

The intrinsic electrochemical properties and activity of single walled carbon nanotube (SWNT) network electrodes modified by a drop-cast Nafion film have been determined using the one electron oxidation of ferrocene trimethyl ammonium (FcTMA+) as a model redox probe in the Nafion film. Facilitated by the very low transport coefficient of FcTMA+ in Nafion (apparent diffusion coefficient of 1.8 × 10−10 cm2 s−1), SWNTs in the 2-D network behave as individual elements, at short (practical) times, each with their own characteristic diffusion, independent of neighbouring sites, and the response is diagnostic of the proportion of SWNTs active in the composite. Data are analysed using candidate models for cases where: (i) electron transfer events only occur at discrete sites along the sidewall (with a defect density typical of chemical vapour deposition SWNTs); (ii) all of the SWNTs in a network are active. The first case predicts currents that are much smaller than seen experimentally, indicating that significant portions of SWNTs are active in the SWNT–Nafion composite. However, the predictions for a fully active SWNT result in higher currents than seen experimentally, indicating that a fraction of SWNTs are not connected and/or that not all SWNTs are wetted completely by the Nafion film to provide full access of the redox mediator to the SWNT surface.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Electrochemistry, Nanotubes -- Analysis, Electrodes, Electrochemical analysis
Journal or Publication Title:	Physical Chemistry Chemical Physics
Publisher:	Royal Society of Chemistry
ISSN:	1463-9076
Official Date:	14 April 2013
Dates:	Date Event 14 April 2013 Published
Volume:	Volume 15
Number:	Number 14
Page Range:	pp. 5030-5038
DOI:	10.1039/c3cp44538k
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), Engineering and Physical Sciences Research Council (EPSRC), University of Warwick. Molecular Organisation and Assembly in Cells, Advantage West Midlands (AWM), European Regional Development Fund (ERDF)
Grant number:	ERC-2009-AdG 247143-QUANTIF

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