The bioelectrosynthesis of acetate

May, Harold D.; Evans, Patrick; LaBelle, Edward V.

doi:10.1016/j.copbio.2016.09.004

Cited by 102 publications

(72 citation statements)

References 48 publications

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“…Abiotic and biotic activity may functionalize the surface of the cathode, thereby facilitating the production of H 2 or formate for the eventual generation of acetate and other products (LaBelle et al, 2014; Yates et al, 2014; Deutzmann et al, 2015; Marshall et al, 2016; May et al, 2016), and the results presented here were dependent upon the addition of the microbial community, but the electrochemical bioreactors were intentionally operated through H 2 with the goal of improving productivity and efficiency. Therefore, it is reasonable to compare microbial electrosynthesis with H 2 gas fermentations (Blanchet et al, 2015; Tremblay et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…However, simply producing a single C-C bond such as in acetate would be worthwhile and much of the work done thus far has focused on electroacetogenesis (Conrado et al, 2013; May et al, 2016). Closely related to this is the bioconversion of syngas (H 2 , CO, and CO 2 ) to fuels and chemicals (Daniell et al, 2012, 2016; Hu et al, 2013, 2016), and within this area of research is the study of H 2 :CO 2 transformation to acetate by acetogenic bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

2017

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It was hypothesized that a lack of acetogenic biomass (biocatalyst) at the cathode of a microbial electrosynthesis system, due to electron and nutrient limitations, has prevented further improvement in acetate productivity and efficiency. In order to increase the biomass at the cathode and thereby performance, a bioelectrochemical system with this acetogenic community was operated under galvanostatic control and continuous media flow through a reticulated vitreous carbon (RVC) foam cathode. The combination of galvanostatic control and the high surface area cathode reduced the electron limitation and the continuous flow overcame the nutrient limitation while avoiding the accumulation of products and potential inhibitors. These conditions were set with the intention of operating the biocathode through the production of H2. Biofilm growth occurred on and within the unmodified RVC foam regardless of vigorous H2 generation on the cathode surface. A maximum volumetric rate or space time yield for acetate production of 0.78 g/Lcatholyte/h was achieved with 8 A/Lcatholyte (83.3 A/m2projected surface area of cathode) supplied to the continuous flow/culture bioelectrochemical reactors. The total Coulombic efficiency in H2 and acetate ranged from approximately 80–100%, with a maximum of 35% in acetate. The overall energy efficiency ranged from approximately 35–42% with a maximum to acetate of 12%.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

2017

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“…[15] The bioanodes operated close to the theoretical potential with observed overpotentials of 0.13 V. The overpotentials of the oxygen redox counter electrode, with a theoretical reversible potential of 0.59 V, amounted to approximately 0.41 V during charging and 0.59 V during discharging. These overpotentials are commonly observed in biocathodes and may be due to the necessity for hydrogen production as a mediating step for microbial acetate synthesis.…”

Section: Discharging Of the Mrb With Oxygen/water Counter Electrodementioning

confidence: 51%

Comparison of Two Sustainable Counter Electrodes for Energy Storage in the Microbial Rechargeable Battery

Molenaar

Elzinga²,

Willemse³

et al. 2019

ChemElectroChem

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Recently, the microbial rechargeable battery (MRB) has been proposed as a potentially sustainable and low-cost electrical energy storage technology. In the MRB, bioelectrochemical CO 2 reduction and subsequent product oxidation has successfully been combined in one integrated system. However, finding a suitable counter electrode is hindering its further development. In this work, we have tested two alternative counter electrodes in duplicate-namely, i) oxygen/water and ii) a capacitive electrode-for use in the MRB platform. During daily charge/ discharge cycling over periods of 11 to 15 days, experimentally obtained energy efficiencies of 25 and 3.7 % were reported when using the capacitive and the oxygen/water electrodes, respectively. Large overpotentials, resulting in a voltage efficiency of 15 % and oxygen crossover leading to coulombic efficiencies of 25 % caused the considerably lower efficiency for the oxygen/water systems, despite the theoretical higher voltage efficiency. Although the capacitive electrode equipped systems performed better, energy density is limited by the operational potential window within which capacitive systems can operate reliably. Microbial community analysis revealed dominant presence of Geobacter in the bioanode and Selenomonadales in the biocathode. These results do not necessarily bring practical application of the MRB closer, but they do provide new insights in the working principle of this new technology.[a] Dr.

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“…If such advances are made direct electron feeding will still face many of the same issues with scaling up reactor size as in situ H 2 production. Many design strategies and considerations for the conversion of carbon dioxide to biocommodities have recently been reviewed in Roy et al (2016) and May et al (2016). …”

Section: Directly Feeding Electronsmentioning

confidence: 99%

“…Summaries of rates of production and Coulombic efficiencies from the literature can be found in Patil et al (2015); Blanchet et al (2015); May et al (2016). The purpose of this review is to consider the evolving understanding of the possibilities in reactor design for each of these approaches.…”

Section: Introductionmentioning

confidence: 99%

How to Sustainably Feed a Microbe: Strategies for Biological Production of Carbon-Based Commodities with Renewable Electricity

Butler

Lovley

2016

Front. Microbiol.

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As interest and application of renewable energy grows, strategies are needed to align the asynchronous supply and demand. Microbial metabolisms are a potentially sustainable mechanism for transforming renewable electrical energy into biocommodities that are easily stored and transported. Acetogens and methanogens can reduce carbon dioxide to organic products including methane, acetic acid, and ethanol. The library of biocommodities is expanded when engineered metabolisms of acetogens are included. Typically, electrochemical systems are employed to integrate renewable energy sources with biological systems for production of carbon-based commodities. Within these systems, there are three prevailing mechanisms for delivering electrons to microorganisms for the conversion of carbon dioxide to reduce organic compounds: (1) electrons can be delivered to microorganisms via H2 produced separately in a electrolyzer, (2) H2 produced at a cathode can convey electrons to microorganisms supported on the cathode surface, and (3) a cathode can directly feed electrons to microorganisms. Each of these strategies has advantages and disadvantages that must be considered in designing full-scale processes. This review considers the evolving understanding of each of these approaches and the state of design for advancing these strategies toward viability.

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The bioelectrosynthesis of acetate

Cited by 102 publications

References 48 publications

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

Energy Efficiency and Productivity Enhancement of Microbial Electrosynthesis of Acetate

Comparison of Two Sustainable Counter Electrodes for Energy Storage in the Microbial Rechargeable Battery

How to Sustainably Feed a Microbe: Strategies for Biological Production of Carbon-Based Commodities with Renewable Electricity

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