Journal
BIOSENSORS & BIOELECTRONICS
Volume 27, Issue 1, Pages 132-136Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2011.06.029
Keywords
Biofuel cell; Flow-through; Air-breathing cathode; NAD(+)-dependent enzyme; Poly-methylene green; Membrane-less
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One of the key goals of enzymatic biofuel cells research has been the development of a fully enzymatic biofuel cell that operates under a continuous flow-through regime. Here, we present our work on achieving this task. Two NAD(+)-dependent dehydrogenase enzymes; malate dehydrogenase (MDH) and alcohol dehydrogenase (ADH) were independently coupled with poly-methylene green (poly-MG) catalyst for biofuel cell anode fabrication. A fungal laccase that catalyzes oxygen reduction via direct electron transfer (DET) was used as an air-breathing cathode. This completes a fully enzymatic biofuel cell that operates in a flow-through mode of fuel supply polarized against an air-breathing bio-cathode. The combined, enzymatic, MDH-Iaccase biofuel cell operated with an open circuit voltage (OCV) of 0.584 V, whereas the ADH-laccase biofuel cell sustained an OCV of 0.618 V. Maximum volumetric power densities approaching 20 mu W cm(-3) are reported, and characterization criteria that will aid in future optimization are discussed. (C) 2011 Elsevier B.V. All rights reserved.
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