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- Pankratova, Galina, et al.
(författare)
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Following Nature : Bioinspired Mediation Strategy for Gram-Positive Bacterial Cells
- 2019
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Ingår i: Advanced Energy Materials. - : Wiley. - 1614-6832 .- 1614-6840. ; 9:16
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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)
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Wiring of Photosystem I and Hydrogenase on an Electrode for Photoelectrochemical H2 Production by using Redox Polymers for Relatively Positive Onset Potential
- 2017
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Ingår i: ChemElectroChem. - : Wiley. - 2196-0216. ; 4:1, s. 90-95
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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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| 6. |
- Zebda, Abdelkader, et al.
(författare)
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Challenges for successful implantation of biofuel cells
- 2018
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Ingår i: Bioelectrochemistry. - : Elsevier. - 1567-5394 .- 1878-562X. ; 124, s. 57-72
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Forskningsöversikt (refereegranskat)abstract
- There is a growing interest in the design and engineering of operational biofuel cells that can be implanted. This review highlights the recent progress in the electrochemistry of biofuel cell technologies, but with a particular emphasis on the medical and physiological aspects that impact the biocompatibility of biofuel cells operating inside a living body. We discuss the challenge of supplying power to implantable medical devices, with regard to the limitations of lithium battery technology and why implantable biofuel cells can be a promising alternative to provide the levels of power required for medical devices. In addition to the challenge of designing a biofuel cell that provides a stable level of sufficient power, the review highlights the biocompatibility and biofouling problems of implanting a biofuel cell that have a major impact on the availability of the substrates inside body that provide fuel for the biofuel cell. These physiological challenges and associated ethical considerations are essential to consider for biofuel cells that are designed to be implanted for long-term operation inside a living animal and eventually to human clinical applications. (C) 2018 The Authors. Published by Elsevier B.V.
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