Membrane-less and mediator-free enzymatic biofuel cell using carbon nanotube/porous silicon electrodes

Document Type

Article

Publication Date

1-1-2009

Abstract

Membrane-less and mediator-free direct electron transfer enzymatic biofuel cells (BFCs) with bioelectrodes comprised of single wall carbon nanotubes (SWNTs) deposited by two methods on porous silicon (pSi) substrates, are reported. In one method the SWNTs were grown by chemical vapor deposition (CVD) and then functionalized with carboxylic groups, and in the second method, pre-synthesized carboxylated SWNTs (c-SWNTs) were electrophoretically deposited on gold-coated pSi. Anodic glucose oxidase (GOx) and cathodic laccase (Lac) were immobilized on the pSi/SWNT substrates to form BFCs in pH 7 phosphate buffer solution. A peak power density of 1.38 μW/cm2 (with a lifetime of 24 h) down to 0.3 μW/cm2 was obtained for a BFC comprised of c-SWNT/enzyme electrodes in 4 mM glucose solution as fuel, corresponding to normal blood sugar concentration, and air as oxidant. BFCs of this relatively simple architecture have the potential for further optimization of power output and lifetime. © 2008 Elsevier B.V. All rights reserved.

Identifier

57749186449 (Scopus)

Publication Title

Electrochemistry Communications

External Full Text Location

https://doi.org/10.1016/j.elecom.2008.10.019

ISSN

13882481

First Page

34

Last Page

37

Issue

1

Volume

11

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