Journal
BIOELECTROCHEMISTRY
Volume 117, Issue -, Pages 34-39Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2017.04.003
Keywords
Microbial fuel cell; Pseudomonas aeruginosa; Biofilm on anode; Phenazine accumulation; Current generation
Funding
- National Natural Science Foundation of China [31200102]
- Fundamental Research Funds for the Central Universities [XDJK2015B018]
- Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, P.R. China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies
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Bacteria biofilm plays a key role in current generation of microbial fuel cells (MFCs), especially for the start-up stage. However, the detailed mechanism of the biofilm promoting the power generation is not very clear so far, especially for those exoelectrogens who rely on the self-excreted electron mediators for extracellular electron transfer. In this work, a biofilm formation inhibitor-sodium houttuyfonate (SH) is used to build a non-biofilm anode of Pseudomonas aeruginosa (P. aeruginosa) without affecting the bacteria growth during the MFC operation. According to the comparison results of the non-biofilm anode and biofilm-covered anode on current generation, phenazines concentration variation and anodic electrocatalysis, the biofilm on the anode not only provides plenty of bacterial cells for catalysis but also promotes the interfacial phenazine redox reaction through accumulating the self-generated mediators on anode for fast interfacial electron transfer. This work proves that the biofilm assisted electron mediator accumulation will benefit such kind of exoelectrogens to sustain sufficient electron mediators for extracellular electron transfer. (C) 2017 Elsevier B.V. All rights reserved.
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