Fast Electron Transfer Kinetics on Multiwalled Carbon Nanotube Microbundle Electrodes

Abstract

The rate of electron transfer at carbon electrodes depends on various factors such as the structure and morphology of the carbon material used in the electrodes. With the advent of new carbon structures, such as fullerenes and carbon nanotubes, well-defined carbon surfaces have become available to probe electron-transfer kinetics on these surfaces. We show here that micron-size electrodes made of multiwalled carbon nanotubes show Nernstien behavior and fast electron-transfer kinetics for electrochemical reactions of Fe(CN) 6 3-/4-. This is achieved without any pretreatments for the electrodes, suggesting the possibility of developing superior carbon electrodes based on carbon nanotubes, for electrochemical applications.

The Redox Behaviour of Randomly Dispersed Single Walled Carbon Nanotubes both in the Absence and in the Presence of Adsorbed Glucose Oxidase

“…The average k 0 values were found to be (6.2 ± 1.4) × 10 -3 and (10.2 ± 5.1) × 10 -3 cms -1 for the bare and SWCNT-modified Au electrodes respectively. We note that our SWCNT modified gold electrodes are not as catalytically active as those reported recently by Nugent and co-workers [15]. The latter reported similar experiments conducted on MWCNT modified platinum electrode surfaces and reported that the ET rate constant for ferrocyanide oxidation is k 0 ≈ 0.5 cm s -1 .…”

Development of electrochemical oxidase biosensors based on carbon nanotube-modified carbon film electrodes for glucose and ethanol

“…2). A fully reversible redox behaviour of hexaamineruthenium(III) was observed, with the cathodic and anodic peaks situated at ∼−0.220 and −0.160 mV, respectively, suggesting ideal reversibility at the electrode, as was also observed with Fe(CN) 6 3−/4− at MWCNT-modified electrodes [44]. A linear dependence of peak current on square root of scan rate was found with a slope of 142 A V −1/2 s 1/2 .…”

Surfactant modified carbon nanotube paste electrode for the sensitive determination of mitoxantrone anticancer drug

“…CNTs behave electrically as a metal or semiconductor. The electronic properties suggest that CNTs have the capability to promote charge-transfer reactions when used as an electrode [15]. The modification of traditional electrode materials with carbon nanotubes for use in analytical sensing is well evidenced and characterized by lower detection limits, increased sensitivities, reduced overpotentials and increased resistance to surface fouling.…”