Microbial fuel cell MFC anode communities often reveal just a few genera, but it is not known to what extent less abundant bacteria could be important for improving performance. A Paracoccus isolate obtained from this biofilm Paracoccus denitrificans strain PS-1 produced only 5. Despite the absence of any Shewanella species in the clone library, we isolated a strain of Shewanella putrefaciens strain PS-2 from the same biofilm capable of producing a higher-power density Our results suggest that the numerical abundance of microorganisms in biofilms cannot be assumed a priori to correlate to capacities of these predominant species for high-power production. Detailed screening of bacterial biofilms may therefore be needed to identify important strains capable of high-power generation for specific substrates.
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Biohybrid Cathode in Single Chamber Microbial Fuel Cell
Anodic biofilm in single-chamber microbial fuel cells cultivated under different temperatures
The biofilm of a microbial fuel cell MFC experiences biofilm-related growth and mass transport and electrochemical electron conduction and charger-transfer processes. We developed a dynamic, one-dimensional, multi-species model for the biofilm in three steps. First, we formulated the biofilm on the anode as a "biofilm anode" with the following two properties: 1 The biofilm has a conductive solid matrix characterized by the biofilm conductivity kappa bio. Second, we derived the Nernst-Monod expression to describe the rate of electron-donor ED oxidation.
The aim of this work is to investigate the properties of biofilms, spontaneously grown on cathode electrodes of single-chamber microbial fuel cells, when used as catalysts for oxygen reduction reaction ORR. To this purpose, a comparison between two sets of different carbon-based cathode electrodes is carried out. The second set of electrodes Pt-free biocathode is based on a bare carbon-based material, on which biofilm grows and acts as the sole catalyst for ORR. Linear sweep voltammetry LSV characterization confirmed better performance when the biofilm is formed on both Pt-based and Pt-free cathodes, with respect to that obtained by biofilm-free cathodes. To analyze the properties of spontaneously grown cathodic biofilms on carbon-based electrodes, electrochemical impedance spectroscopy is employed.
Microbial fuel cells MFCs have been receiving an increased attention over the last years due to their potential to combat two global problems: waste pollution and energy demand. Additionally, when a wastewater is used, MFCs can perform its treatment while recovering energy, leading to the possibility of energy-producing wastewater treatment plants, offsetting their operational costs. However, to overcome their current limitations lower power outputs and higher costs , a clear understanding of the effect of operation and design parameters on its overall performance is mandatory.