期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 6, 页码 2633-2639出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp908830d
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资金
- War-wick University
- ORS
- EPSRC
- Advantage West Midlands
- European Regional Development Fund
- EPSRC [EP/D000165/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D000165/1] Funding Source: researchfish
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.
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