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Sökning: WFRF:(Milton Ross D.)

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1.
  • Pankratova, Galina, et al. (författare)
  • Following Nature : Bioinspired Mediation Strategy for Gram-Positive Bacterial Cells
  • 2019
  • Ingår i: Advanced Energy Materials. - : Wiley. - 1614-6832 .- 1614-6840. ; 9:16
  • Tidskriftsartikel (refereegranskat)abstract
    • Employment of redox polymers as mediators is a promising concept to facilitate electron transfer (ET) and improve operational performance of bioelectrochemical systems. Materials science offers a broad range of mediation possibilities; however, their employment so far relies on a trial-and-error approach, since there is no comprehensive understanding of the nature of the ET between bacterial cells and redox polymers. In the current work, the polymer–cell interaction is investigated in detail and clear experimental evidence that a redox polymer containing quinone moieties mimicking the natural bacterial charge carriers can be incorporated into the respiratory chain of Gram-positive Enterococcus faecalis cells and outperform monomeric mediator in ET features is reported. The presented findings disclose the main principles to overcome incompatibilities between abiotic charge carriers and microbial metabolism and provide essential knowledge for further development of mediated microbial bioelectrocatalysis.
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2.
  • Tapia, Cristina, et al. (författare)
  • Wiring of Photosystem I and Hydrogenase on an Electrode for Photoelectrochemical H2 Production by using Redox Polymers for Relatively Positive Onset Potential
  • 2017
  • Ingår i: ChemElectroChem. - : Wiley. - 2196-0216. ; 4:1, s. 90-95
  • Tidskriftsartikel (refereegranskat)abstract
    • Photosystem I (PSI) is combined with Desulfovibrio gigas hydrogenase for the bioelectrocatalytic photosynthesis of hydrogen at an electrode surface. The activity of these two biocatalysts is linked by two redox polymers; a redox polymer with a relatively positive potential (loaded with an Os complex) is able to reduce PSI and thus facilitates the production of photoexcited electrons, whereas redox polymers of relatively low potential are able to transfer electrons to the hydrogenase. Two negative-potential redox polymers are tested, with either a viologen pendant (4-methyl-4′-bromopropylviologen functionalized linear polyethylenimine) or a cobaltocene pendant (cobaltocene-functionalized branched polyethylenimine, Cc-BPEI). Both are able to protect hydrogenase from O2 inactivation, but only the use of Cc-BPEI yields significant photocurrents for H+ reduction, likely due to its lower redox potential. The photocurrents obtained are found to be proportional to the quantity of H2 produced, reaching a maximum of −30 μA cm−2 for the system incorporating Cc-BPEI and showing a relatively positive onset potential at +0.38 V versus SHE.
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  • Resultat 1-2 av 2

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