Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 17, Pages 4480-4483Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201400463
Keywords
biofilms; graphene; microbial electrosynthesis; microbial fuel cells; self-assembly
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Funding
- Ministry of Science and Technology of China (973 Program) [2014CB745100]
- National Natural Science Foundation of China [21306069, 21376174]
- Ministry of Science and Technology of China (863 Program) [2012AA02A701]
- Natural Science Foundation of Jiangsu Province [13K20130492]
- Six Talent Peaks program (Jiangsu Province, China) [2012-NY-029]
- AcRF Tier-1 grant (MOE, Singapore) [RG 78/10]
- AcRF Tier-2 grant [MOE2011-T2-2-035]
- Environment and Water Industry Programme Office of Singapore
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Low extracellular electron transfer performance is often a bottleneck in developing high-performance bioelectrochemical systems. Herein, we show that the self-assembly of graphene oxide and Shewanella oneidensis MR-1 formed an electroactive, reduced-graphene-oxide-hybridized, three-dimensional macroporous biofilm, which enabled highly efficient bidirectional electron transfers between Shewanella and electrodes owing to high biomass incorporation and enhanced direct contact-based extracellular electron transfer. This 3D electroactive biofilm delivered a 25-fold increase in the outward current (oxidation current, electron flux from bacteria to electrodes) and 74-fold increase in the inward current (reduction current, electron flux from electrodes to bacteria) over that of the naturally occurring biofilms.
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