Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells

Hong, Yiying; Call, Douglas F.; Werner, Craig M.; Logan, Bruce E.

doi:10.1016/j.bios.2011.06.045

Cited by 172 publications

(68 citation statements)

References 29 publications

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“…The electro catalytic behavior of the activated anodes was characterized by slow LSV (1 mV s −1 ), after voltage stabilization for approximately 100 hours. Figure 1D shows that all activated anodes exhibited catalytic behavior for the bio-electro oxidation of acetate as shown by the appearance of an oxidation current at an onset potential of −0.25 V (vs. SHE) similar to other previous reports [21,28,30]. Significant differences in currentpotential profiles were observed for anodes activated using different external resistances.…”

Section: Anode Activation At Different External Resistancesupporting

confidence: 68%

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The Effect of Intermittent Limiting Anodic Current Stimulation on the Electro Activity of Anodic Biofilms

Zhang¹,

Yu²,

Zhang³

et al. 2017

J Adv Chem Eng

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Journal of Advanced Chemical EngineeringZhang et al., J Adv Chem Eng 2017, 7:1 DOI: 10.4172/2090 Volume AbstractElectro active biofilms is key components of bio electrochemical systems. Anodic biofilms formed by a potentialadaptive way (i.e., operation with constant external resistance or poised anode potentials) generally lack the ability to adapt to limiting currents. In the present study, a strategy based on intermittent limiting anodic current application was first employed to directly stimulate the current-adaptive growth of anodic biofilms, aiming to obtain electro active biofilms with high current adaptation. Series of intermittent limiting anodic current stimulations exhibit effectiveness for enhancing the electro-activity of anodic biofilms. Porous thick anodic biofilms with less extracellular polymeric substance production could be obtained by series of intermittent limiting anodic currents application from thin biofilms, generating robust anodic biofilms. The high stable power output of 4.35 W m −2 could be achieved with robust anodic biofilms at high working current of 9.5 A m −2 . The present study show that current is a crucial factor influencing the performance of electro-active biofilms, suggesting that an alternative current-adaptive method could be developed for the growth of electro active biofilms with high performance.

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Section: Anode Activation At Different External Resistancesupporting

confidence: 68%

“…For scanning electronic microscopy (SEM), carbon felt anodes were removed from the chamber, and biofilms were fixed with 1% gluteraldehyde overnight, followed by dehydration with a series of graded ethanol (30,50,70,80,95, and 100%). The anode surface was observed using scanning electronic microscopy (HITACHI S-4800 SEM).…”

Section: Measurementsmentioning

confidence: 99%

The Effect of Intermittent Limiting Anodic Current Stimulation on the Electro Activity of Anodic Biofilms

Zhang¹,

Yu²,

Zhang³

et al. 2017

J Adv Chem Eng

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“…The medium replacement process removed suspended microbes and reduced the contribution of any redox-active soluble electron shuttles that may have been produced by the bacteria. To establish electrogenic communities, the external resistor was decreased stepwise from 510 O to 22 O (Figure 1), which has been successfully demonstrated to improve MFC electron recovery (Fan et al, 2008;Shimoyama et al, 2008;Hong et al, 2011;Jung and Regan, 2011 (Figure 2). The SP-L-b reactor started generating current more slowly than the SP-L-a reactor, indicating that an anode potential of À 200 mV vs SHE may not have been a favorable selective pressure to reproducibly select for similar microbial EET activities.…”

Section: Mfc and Sp Enrichment And Current Generationmentioning

confidence: 99%

Microbial population and functional dynamics associated with surface potential and carbon metabolism

Ishii¹,

et al. 2013

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Microbial extracellular electron transfer (EET) to solid surfaces is an important reaction for metal reduction occurring in various anoxic environments. However, it is challenging to accurately characterize EET-active microbial communities and each member's contribution to EET reactions because of changes in composition and concentrations of electron donors and solid-phase acceptors. Here, we used bioelectrochemical systems to systematically evaluate the synergistic effects of carbon source and surface redox potential on EET-active microbial community development, metabolic networks and overall electron transfer rates. The results indicate that faster biocatalytic rates were observed under electropositive electrode surface potential conditions, and under fatty acid-fed conditions. Temporal 16S rRNA-based microbial community analyses showed that Geobacter phylotypes were highly diverse and apparently dependent on surface potentials. The well-known electrogenic microbes affiliated with the Geobacter metallireducens clade were associated with lower surface potentials and less current generation, whereas Geobacter subsurface clades 1 and 2 were associated with higher surface potentials and greater current generation. An association was also observed between specific fermentative phylotypes and Geobacter phylotypes at specific surface potentials. When sugars were present, Tolumonas and Aeromonas phylotypes were preferentially associated with lower surface potentials, whereas Lactococcus phylotypes were found to be closely associated with Geobacter subsurface clades 1 and 2 phylotypes under higher surface potential conditions. Collectively, these results suggest that surface potentials provide a strong selective pressure, at the species and strain level, for both solid surface respirators and fermentative microbes throughout the EET-active community development.

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“…27) Although the phenomenon has been reported in numerous MFC studies, its mechanism is not fully understood. 28) Nevertheless, it has been suggested that power overshoot is due to limited performance of the anode under sub-optimal conditions. 29) In addition, the increase in the operating temperature could also improve the diffusion coefficients of the substrates and protons, causing the decrease in internal resistance of the MFC and hence the improvement of MFC performance.…”

Section: Effects Of the Operating Temperature On Mfc Performancementioning

confidence: 99%

Bioelectrochemical analysis of a hyperthermophilic microbial fuel cell generating electricity at temperatures above 80 °C

Fukushima

Maeda

et al. 2015

Bioscience, Biotechnology, and Biochemistry

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We examined whether a hyperthermophilic microbial fuel cell (MFC) would be technically feasible. Two-chamber MFC reactors were inoculated with subsurface microorganisms indigenous to formation water from a petroleum reservoir and were started up at operating temperature 80 °C. The MFC generated a maximum current of 1.3 mA 45 h after the inoculation. Performance of the MFC improved with an increase in the operating temperature; the best performance was achieved at 95 °C with the maximum power density of 165 mWm−2, which was approximately fourfold higher than that at 75 °C. Thus, to our knowledge, our study is the first to demonstrate generation of electricity in a hyperthermophilic MFC (operating temperature as high as 95 °C). Scanning electron microscopy showed that filamentous microbial cells were attached on the anode surface. The anodic microbial consortium showed limited phylogenetic diversity and primarily consisted of hyperthermophilic bacteria closely related to Caldanaerobacter subterraneus and Thermodesulfobacterium commune.

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Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells

Cited by 172 publications

References 29 publications

The Effect of Intermittent Limiting Anodic Current Stimulation on the Electro Activity of Anodic Biofilms

The Effect of Intermittent Limiting Anodic Current Stimulation on the Electro Activity of Anodic Biofilms

Microbial population and functional dynamics associated with surface potential and carbon metabolism

Bioelectrochemical analysis of a hyperthermophilic microbial fuel cell generating electricity at temperatures above 80 °C

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