The electrochemical growth current of poly( o -phenylenediamine) as well as its redox current were enhanced several-fold when deposited on a carbon nanotube modified glassy carbon electrode compared to the same at a glassy carbon surface. The current enhancements during the growth of the polymer were not due to any surface area effects but are attributed to a facilitated nucleation involving acidic sites of the carbon nanotube. The poly( o -phenylenediamine)−carbon nanotube composite electrode showed a polymer redox-mediated electrocatalytic effect for oxygen reduction reaction with a 5-fold enhancement in current and a favorable potential shift of 130 mV compared to the values obtained at a poly( o -phenylenediamine) electrode.
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Gajendran et al. (2007) studied this question.
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