title: Impact of a static magnetic field on the electricity production of Shewanella-inoculated microbial fuel cells.
abstract: The electricity production of Shewanella-inoculated microbial fuel cells (MFCs) under magnetic field (MF) exposure was investigated in different reactor systems. The persistency of the MF effect and the influences of MF intensity and direction on MFC performance were also studied. Application of a 100-mT static MF to the MFCs improved electricity production considerably, with an increase in the maximum voltage by 20-27% in both single- and two-chamber MFCs, while a more conspicuous improvement in the electricity generation was observed in a three-electrode cell. The MF effects were found to be immediate and reversible, and adverse effects seemed to occur when the MF was suddenly removed. The medium components analysis demonstrated that the application of MF led to an enhanced bioelectrochemical activity of Shewanella, and no significant promotion in mediator secretion was found. The improvement in the electricity production of MFCs under MF was mainly attributed to the enhanced bioelectrochemical activity, possibly through the oxidative stress mechanism. An accelerated cell growth under MF might also contribute to the enhanced substrate degradation and power generation.
authors.affiliation: Department of Chemistry, University of Science & Technology of China, 96, Jinzhai Road, Hefei 230026, Anhui, China.
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Li
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Sheng
authors.forename: Xian-Wei
authors.initials: XW
authors.lastname: Liu
authors.forename: Pei-Jie
authors.initials: PJ
authors.lastname: Cai
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Xiang
authors.initials: X
authors.lastname: Xiao
authors.forename: Yun-Kun
authors.initials: YK
authors.lastname: Wang
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Tong
authors.forename: Fang
authors.initials: F
authors.lastname: Dong
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology*; D019149:Bioreactors / Q000382:microbiology; D004560:Electricity; D055664:Electrochemical Techniques; D008280:Magnetics; D018384:Oxidative Stress; D020592:Shewanella / Q000254:growth & development / Q000378:metabolism*