We report on oxygen reduction in a physiological buffer solution (0.05 M phosphate buffer containing dissolved O2, 0.1 M NaCl, pH 7.4, 37 °C) by Melanocarpus albomyces laccase, co-immobilized with [Os(2,2'-bipyridine)2(polyvinylimidazole)10Cl]+/2+as a mediator, on glassy carbon electrodes. Such oxygen cathodes yielded current densities of 3.8 mA cm-2at 0.2 V vs. Ag/AgCl, the largest current density reported to date for a mediated laccase cathode in physiological buffer solutions, showing promise for development of biocatalytic fuel cell prototypes. © 2008 Elsevier B.V. All rights reserved.
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