Abstract
An electrochemically oxidized carbon fiber paper (CFP) electrode was fabricated and the direct electrochemical oxidation of NADH was examined for a biofuel cell application. The Raman spectra of the oxidized CFP electrode indicated that edge plane sites were generated by electrochemical activation. On a cyclic voltammogram of the electrode at pH 7.0, an oxidation-reduction peak with a redox potential of about 0 mV (vs. Ag/AgCl) appeared. The electrocatalytic oxidation of NADH with an anodic peak at low potential (+50 mV) occurred and the current density reached as large as a few mA/cm2. The quinoidal moieties which are generated at the edge plane site act as an electron transfer mediator. With NAD+-dependent alcohol dehydrogenase (ADH), the ADH catalyzed bioanode could be constructed by entrapment with poly(diallyldimethylammonium chloride) on the oxidized CFP electrode.
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