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Using Microbial Fuel Cell System as Biosensors
Published in Lakhveer Singh, Durga Madhab Mahapatra, Waste to Sustainable Energy, 2019
Tuoyu Zhou, Shuting Zhang, Huawen Han, Xiangkai Li
MET pathway relies on the secreted extracellular molecules. In Pseudomonas, Phenazines has been demonstrated as intrinsic electron shuttle of EET pathway (Marsili et al. 2008). Flavin and riboflavin were also proved as the main electron shuttles in S. oneidensis (Pham et al. 2008, Wang et al. 2010). Although some exogenous redox agents have been introduced to MFC to facilitate electron transfer, these exogenous redox mediators required continuous addition and only achieve relatively low power density (Zheng et al. 2015, Doohyun and Zeikus 2000). Furthermore, these additional electron shuttles need to consider the possible environmental pollution problems. Physical contact between MFC anode surface and bacterial cell membrane is prerequisite for DET pathway. The electron transport proteins on the EAM membrane, including OmcZ, c-type cytochrome, and heme protein, can transfer electrons from bacterial cells to outer membrane (OM), where the electron was transferred to electrode (Inoue et al. 2010, Lovley et al. 2009). Despite the lack of C-cell pigment in some dissimilated bacteria, they use the electrically conductive filamentous extracellular appendage, which is also known as bacterial nanowires, to transfer electron into anode instead (Reguera et al. 2005).
Bioenergy Principles and Applications
Published in Eduardo Rincón-Mejía, Alejandro de las Heras, Sustainable Energy Technologies, 2017
Marina Islas-Espinoza, Alejandro de las Heras
Mineralization of substrates by microorganisms can construct nanostructured porous materials for electrodes of batteries. Electroactive microbes can transfer electrons over long distances between the cell surface and external substrates by using conductive pili (bacterial nanowires). The use of nanostructured electrode materials is also attractive to improve the capacity, cycling life, and safety of batteries. Viruses have the potential for templating carbon nanotube electrodes at ambient temperatures, and bacterial biofilms can be used for the design of nanofibers (Adesina et al., 2017).
An analysis of the influence of affordable housing system on price
Published in Dawei Zheng, Industrial, Mechanical and Manufacturing Science, 2015
Gorby, Y. A.; Yanina, S.; McLean, J. S.; Rosso, K. M.; Moyles, D.; Dohnalkova, A.; Beveridge, T. J.; Chang, I. S.; Kim, B. H.; Kim, K. S.; Culley, D. E.; Reed, S. B.; Romine, M. F.; Saffarini, D. A.; Hill, E. A.; Shi, L.; Elias, D. A.; Kennedy, D. W.; Pinchuk, G.; Watanabe, K.; Ishii, S.; Logan, B. E.; Nealson, K. H., Fredrickson, J. K. 2006. Electrically conductive bacterial nanowires produced by Shewanella oneidensis strain MR-1 and other microorganisms. PNAS, July 25, vol. 103 no. 3011358–11363.
Energy harvesting using exoelectrogenic Shewanella oneidensis bacteria
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Young H. Park, Edward Park, Geoffrey Smith
Researches have been conducted to study exoelectrogenic Shewanella oneidensis bacteria that control the redox transformation of heavy metals and other electron acceptors for use in energy conversion (Lies et al. 2005). An important feature of S. oneidensis bacteria is that they produce electrically conductive nanowires that facilitate electron transfer to electron acceptors. Hence, research attempts were made to use S. oneidensis for a mediator-free microbial fuel cell (MFC) that can treat wastewater and produce electricity simultaneously without any synthetic mediators (Kim et al. 2002). The cost of the S. oneidensis based MFC can be reduced and the design simplified compared to MFCs based on bacterial species that are inactive for the transport of electrons and thus need electron transport mediators that shuttle the electrons between microbes and electrodes (Park and Zeikus 2000). In the S. oneidensis based MFC, the electrons are released via catalytic oxidation of organic substrates by S. oneidensis bacteria and transferred to the anode by bacterial nanowires in the anode chamber (Pirbadian et al. 2014; Reguera et al. 2005). The electrons eventually reach the cathode via an external electrical circuit and combine with electron acceptor (oxygen) and the protons that move from the anode chamber to the cathode chamber through a separator; the resulting byproduct is water in the cathode chamber (Bond et al., 2002; Min and Logan 2004). Proton-exchange membranes are widely used as a separator for efficient transport for protons from the anode to the cathode while impeding substrate and oxygen to penetrate. Due to the high cost of these membranes, low cost alternatives such as PVDF-co-HFP (Kumar et al. 2015) and a blend of polybenzimidazole (PBI) and polyvinylpyrrolidone (PVP) (Kumar et al. 2016b) were considered as a separator. Nanomaterial as a nano-filler was also utilized in the blend of a PVDF-co-HFP to increase the efficiency (Kumar et al. 2016a). Shewanella oneidensis is dissimilatory metal-reducing bacteria (DMRB) that can reduce metal compounds. While the anode is engaged in substrate oxidation in the form of wastewater, the cathode can accept electrons produced and catalyze metal oxidation by the DMRB, which can use metals as electron acceptors. Wastewater containing heavy metal such as Co (III) (Huang et al. 2014) and Cr (VI) (Wu et al. 2015) thus can be treated successfully (Wang and Ren 2014) with DMRB. Hence a Shewanella oneidensis based MFC offers potential benefits for environmental sustainability as well as sustainable technology for simultaneous wastewater treatment and electrical power generation (Wu et al. 2018). In this study, we designed a single chamber membraneless bioreactor and harvested energy from the reactor in which electrons were transported from oxidation region to reduction region directly by Shewanella nanowires without an external circuit or a separator.