Electrical energy generation in a double-compartment microbial fuel cell using Shewanella spp. strains isolated from Odo
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(2020) 30:31
Sustainable Environment Research
RESEARCH
Open Access
Electrical energy generation in a doublecompartment microbial fuel cell using Shewanella spp. strains isolated from Odontesthes regia Sandy L. Calderon1,2, Pilar García Avelino2, Angélica María Baena-Moncada1,2, Ana Lucía Paredes-Doig1 and Adolfo La Rosa-Toro1,2*
Abstract This study is focused on electrical energy generation in a double-compartment microbial fuel cell. Carbon felt impregnated with multi-walled carbon nanotubes was used as an anode, which contained gold nanoparticles and Shewanella spp. grown under aerobic conditions was used as a biocatalyst. The electrodes, used before and after biofilm growth, were characterized by scanning electron microscopy and cyclic voltammetry. The results revealed the formation of Shewanella spp. colonies on the electrode surface and electrochemical activity under aerobic and anaerobic conditions. During biofilm growth in Luria Bertani medium, a stabilized average power density of 281 mW m− 2 was recorded. Subsequently, the cell reached a maximum current density of 0.11 mA cm− 2 after 72 h of operation and a coulombic efficiency of 65% under anaerobic conditions. Keywords: Microbial fuel cell, Shewanella spp., Aerobic anodic chamber, Multi-walled carbon nanotubes, Gold nanoparticles
Introduction In recent years, many researches have been focused on the study of microbial fuel cells (MFC) for conversion of chemical energy to electrical energy [1, 2]. MFCs generate energy through electron transfer from the microbial cell to the fuel cell anode. The ability of microorganisms to generate an electrochemical potential is naturally occurring in several microbial species such as the Gram-negative Shewanellaceae and Geobacteracea, which are called exoelectrogenic bacteria as they tend to produce electrochemically active biofilms on the electrodes (in particular the anodes) [2–4]. Researchers have reported electrochemical activity in the biofilm formation under anaerobic conditions [5, 6]. The systems that use these * Correspondence: [email protected] 1 Research Laboratory of Applied Electrochemistry, National University of Engineering, Lima 01, Peru 2 Center for the Development of Advanced Materials and Nanotechnology, National University of Engineering, Lima 01, Peru
bacteria require special conditions, such as the absence of oxygen. Therefore, their application is limited to use sludge inoculums and to apply MFC on seabed. For this reason, the study on energy generation for active bacteria in aerobic and anaerobic environments such as Shewanella spp., can widen the scope and application of these systems. Shewanella spp., are Gram negative bacilli which have bacillary mobility with a single polar scourge, an important phenotypic feature is the production of hydrogen sulfide [7]. Shewanella spp. are distributed throughout the world, mainly in marine environments. On the one hand, they are capable of reducing substances such as nitrate, nitrite, thiosulfate and trimethylamine-N-oxide [8]. The biofilm-forming abi
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