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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.