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Exoelectrogenic Bacteria: A Candidate for Sustainable Bio-electricity Generation in Microbial Fuel Cells
Published in Lakhveer Singh, Durga Madhab Mahapatra, Waste to Sustainable Energy, 2019
Shraddha Shahane, Payel Choudhury, O.N. Tiwari, Umesh Mishra, Biswanath Bhunia
The direct electron transfer doesn’t include diffusional redox species in direct mechanism of electron transfer. Such type of electron transfer has been found in Geobacter species or mixed culture (Pant et al. 2010). There are various microorganisms which transfer electrons from inside the cell to extracellular acceptors through cytochromes, biofilms and well conductive nanowires (Lovley 2008). Shewanella putrefaciens, Geobacter sulferreducens, and Rhodoferax ferrireducens etc. are some examples of microbes reported for having direct contact mechanism for electron transfer. Shewanella putrefaciens have first reported a microbial strain to generate electricity in absence of mediator (Park and Zeikus 1999). Shewanella putrefaciens has outer membrane cytochromes to transfer electron directly as well as extract electrically conductive nanowires (Gorby et al. 2006, Myers and Myers 1992).
A review of design, operational conditions and applications of microbial fuel cells
Published in Biofuels, 2018
Rachna Goswami, Vijay Kumar Mishra
Shewanella putrefaciens is a gram-negative marine bacterium. S. putrefaciens is also a facultative anaerobe with the capability to reduce iron and manganese metabolically. In liquid media, the organism is also fast-growing. Ringeisen et al. [79] exploited Shewanella oneidensis DSP10 in growth medium with lactate and buffered ferricyanide solutions as anolyte and catholyte, respectively. Maximum power densities and current densities of 24 and 10 mWm−2 and 44 and 20 mAm−2, respectively, were measured using the true surface areas of reticulated vitreous carbon (RVC) and graphite felt electrodes without the use of exogenous mediators in the anolyte. Biffinger et al. [80] compared S. oneidensis MR-1 with DSP 10. S. oneidensis MR-1 was found to be more appropriate than DSP10 for MFCs with high acidity levels. Kim et al. [3] studied direct electron transfer from different S. putrefaciens strains to an electrode through cyclic voltammetry and a fuel-cell type electrochemical cell. They both studied the electrochemical activity of the bacterium without any electrochemical mediators. It was noticed that the anaerobically grown cells of S. putrefaciens MR-1, IR-1 and SR-21 displayed electrochemical activities, but no activities were observed in aerobically grown S. putrefaciens cells. In another case, cysteine was used as substrate for the electricity production using MFC [37]. 16S ribosomal RNA (16S rRNA) study of the biofilm on the anode of the MFC inferred that the predominant organisms were Shewanella spp. closely related to Shewanella affinis. Park and Zeikus [55] observed the effect of electrode composition on the electricity generation in a single compartment fuel cell using S. putrefaciens. They found that the electricity production was dependent on anode composition, electron donor type and cell concentration.