Journal
BIOSENSORS & BIOELECTRONICS
Volume 22, Issue 6, Pages 941-947Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2006.04.019
Keywords
ABTS; bioelectrocatalysis; biofuel cell; diffusion layer; laccase; microfluidics
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Microfluidic biofuel cells exploit the lack of convective mixing at low Reynolds number to eliminate the need for a physical membrane to separate fuel from oxidant. This paper demonstrates how the length and spacing of electrodes within a microchannel, and thus thickness of the diffusion layer, affects the performance of a microfluidic biofuel cell. It was found that splitting a single electrode into two (or more) smaller electrodes and separating them by a distance equal to three times their length prevents the continuous increase in thickness of a diffusion layer. This change results in a 25% increase in maximum power density compared to a single electrode device with identical electroactive area. Furthermore, we found that the maximum current density of a microfluidic biofuel cell operated with different electrode configurations (i.e., length of cathode) closely matches that predicted by theory. (c) 2006 Elsevier B.V. All rights reserved.
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