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Carbon nanotubes (CNTs) have emerged as a novel class of nanomaterials and consequently receive considerable interest in a plethora of areas,[1–7] none more so than in electrochemistry and electrocatalysis where their use has escalated over the last decade owing to the reported “electrocatalytic” properties of carbon-nanotube-modified electrodes, that is, electrodes usually made of carbon with a film of nanotubes.[8–13] These properties include reductions in overpotentials, increments in the voltammetric peak heights which facilitates lower detection limits and enhanced sensitivities in analytical sensing coupled with little or no observed surface fouling.[8–10, 13]

We have compared the electroreduction of ferricyanide and the oxidation of epinephrine in aqueous solutions at carbon-nanotube-modified electrodes with the response of an edge-plane pyrolytic graphite (EPPG) electrode.[11, 12] The EPPG …