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Electron transfer kinetics at single-walled carbon nanotube electrodes using scanning electrochemical microscopy
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Dumitrescu, Ioana, Dudin, Petr V., Edgeworth, Jonathan P., Macpherson, Julie V. and Unwin, Patrick R. (2010) Electron transfer kinetics at single-walled carbon nanotube electrodes using scanning electrochemical microscopy. The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.114 (No.6). pp. 2633-2639. doi:10.1021/jp908830d ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp908830d
Abstract
An important open question oil the electrochemistry of single-walled carbon nanotube (SWNT) electrodes concerns the sites at which electron transfer (ET) occurs. This issue is addressed herein for the case of a simple outer sphere redox couple, (ferrocenymethyl)trimethylammonium (FcTMA(+)). Using relatively sparse networks (<1% surface coverage) of electrically connected SWNTs, coupled to a scanning electrochemical microscopy (SECM) Substrate generation-tip collection setup, we show that high rates of mass transport can be generated to SWNTs, allowing kinetic effects to be observed in the voltammetric waveshape. By developing a numerical model that faithfully represents all aspects of the experimental geometry, highly accurate kinetic data can be obtained. Assuming that all SWNTs are active, a minimum average ET rate constant k(SWNT)(0) > 1.0 +/- 0.6 cm s(-1) is assigned, which is of similar size to other electrode materials and suggests that the sidewall of SWNTs has considerable ET activity.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Charge exchange, Nanotubes, Scanning electrochemical microscopy, Electrodes | ||||
Journal or Publication Title: | The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 1932-7447 | ||||
Official Date: | 18 February 2010 | ||||
Dates: |
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Volume: | Vol.114 | ||||
Number: | No.6 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 2633-2639 | ||||
DOI: | 10.1021/jp908830d | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | University of Warwick, Engineering and Physical Sciences Research Council (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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