title: Towards high power output of scaled-up benthic microbial fuel cells (BMFCs) using multiple electron collectors.
abstract: This study aimed at achieving high power output of benthic microbial fuel cells (BMFCs) with novel geometric anode setups (inverted tube granular activated charcoal (IT-GAC) and carbon cloth roll (CCR)) and multiple anodes/electron collectors. The lab-scale tests showed the power density of IT-GAC and CCR anodes achieved at 2.92 and 2.55 W m(-2), the highest value ever reported in BMFCs. The power density of BMFCs substantially increased with electron collector number (titanium rods) in anodes. The connection of multiple electron collectors with multiple cathodes had much higher total voltage/current output than that with single cathode. The possibility of maintaining high power density at scaled-up BMFCs was explored by arranging multiple anodes in sediment. The compact configuration of multiple CCR anodes contacting each other did not deteriorate the performance of individual anodes, showing the feasibility of maximizing anode numbers per sediment footprint and achieving high power output. Multiple IT-GAC and CCR anodes with multiple collectors effectively utilized sediment at both horizontal and vertical directions and enhanced electron collection efficiency. This study demonstrated that bacterial adhesion and electron collection should be optimized on small anodes in order to maintain high power density and achieve high power output in the scaled-up BMFCs.
authors.affiliation: School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China. Electronic address: bingchuan@hust.edu.cn.
authors.forename: Bingchuan
authors.initials: B
authors.lastname: Liu
authors.affiliation: Department of Civil & Environmental Engineering, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269, United States.
authors.forename: Isaiah
authors.initials: I
authors.lastname: Williams
authors.affiliation: Department of Civil & Environmental Engineering, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269, United States.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Electrical & Computer Engineering, University of Connecticut, 371 Fairfield Way, Unit 4157, Storrs, CT 06269, United States.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Civil & Environmental Engineering, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269, United States.
authors.forename: Amvrossios
authors.initials: A
authors.lastname: Bagtzoglou
authors.affiliation: Chemical & Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, CT 06269, United States.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: McCutcheon
authors.affiliation: Department of Civil & Environmental Engineering, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269, United States. Electronic address: baikun@engr.uconn.edu.
authors.forename: Baikun
authors.initials: B
authors.lastname: Li
mesh_terms: D001674:Bioelectric Energy Sources / Q000191:economics; D004560:Electricity; D004566:Electrodes; D004583:Electrons; D004867:Equipment Design
keywords: Benthic microbial fuel cell; Carbon cloth rolls; Electron collectors; Granular activated charcoal; Power density; Power output