期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 11, 期 1, 页码 34-37出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.10.019
关键词
Biofuel cell; Membrane-less and mediator-free; Porous silicon; Carbon nanotubes; Glucose oxidase; Laccase
资金
- New Jersey Commission for Science and Technology
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 mu W/cm(2) (with a lifetime of 24 h) down to 0.3 mu W/cm(2) 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. (C) 2008 Elsevier B.V. All rights reserved.
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