Journal
BIOSENSORS & BIOELECTRONICS
Volume 25, Issue 5, Pages 1248-1251Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.10.002
Keywords
Microbial fuel cell; Carbon nanotubes; Shewanella oneidensis; Electrode modification; Direct electron transfer
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This study compared voltammetric behavior and catalytic current generation of Shewanella oneidensis on glassy carbon electrode (GCE) with and without carbon nanotube (CNT) modifier. A bare GCE in an electrochemical cell inoculated with S. oneidensis delivered a low current density of 0.117 +/- 0.006 mu A/cm(2) after being anodically polarized for 15 h. Cyclic voltammogram suggested current generation could be attributed to S. oneidensis's cell surface cytochromes. But the cytochromes demonstrated irreversible electrochemistry, where electro-oxidation was inhibited. Modification of the working electrode with CNTs transformed such rectification behavior. Additionally, the kinetics of electron transfer(Er) between cell surface cytochrome and electrode was enhanced, it was characterized by reduced oxidative/reductive peak separation. The heterogeneous ET rate constant was estimated to be 1.25 s(-1) with the modified electrode. The promoting effect of CNTs directly raised current density to 9.70 +/- 0.40 mu A/cm(2), a level 82 times greater than that of the original. The CNTs may have similar promoting effects towards exocellular Er of other exoelectrogens. (C) 2009 Elsevier B.V. All rights reserved.
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