Journal
BIOSENSORS & BIOELECTRONICS
Volume 69, Issue -, Pages 113-120Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.02.025
Keywords
Microbial fuel cells; Electricigens; Kocuria rhizophila; Electron transfer mechanism; Chemical modification
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Funding
- Lab Opening Foundation of Tianjin University of Science and Technology [1404A203]
- Open Fund of Key Laboratory of Original Agro-environment Quality of Ministry of Agriculture
- Tianjin Key Laboratory of Agro-environment and Agro-product Safety [2012-SZJJ-CYM]
- [GEFC09-12]
- [NCET-08-0296]
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It is certainly an important research area to discovery new exoelectrogens for microbial fuel cells (MFCs), and how to effectively manipulate its cell property to improve power performance is still a great challenge. In this study, a new electrochemically active bacterium phylogenetically related to Kocuria rhizophila was first isolated and found electrogenic in MFCs, which was identified through the combination methods of molecular biology, physiological, biochemical and morphological characteristics. The MFCs inoculated with this strain generated power from a wide variety of substrates, reached a maximum power density of 75 mW/m(2) in the substrate of 1 g/L glucose. And the electron transfer mechanism was confirmed to be dominantly direct biofilm mechanism. Chemical treatment with five reagents was verified to be a feasible strategy to improve the power density of MFCs, increasing approximately 1.75 fold at most after treated with lysozyme. This enhancement was contributed to the significant enhancement on cell permeability, cell membrane fluidity and Coenzyme Q(10) (the electron carrier). Thus this work offered a novel Gram-positive electrogenic bacterium and proved chemical treatment was a feasible strategy to improve electron transfer for application in MFCs. (C) 2015 Elsevier B.V. All rights reserved.
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