Porous translucent electrodes enhance current generation from photosynthetic biofilms.
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Wenzel, T., Härtter, D., Bombelli, P., Howe, C., & Steiner, U. (2018). Porous translucent electrodes enhance current generation from photosynthetic biofilms.. Nature communications, 9 (1), 1299. https://doi.org/10.1038/s41467-018-03320-x
Some photosynthetically active bacteria transfer electrons across their membranes, generating electrical photocurrents in biofilms. Devices harvesting solar energy by this mechanism are currently limited by the charge transfer to the electrode. Here we report the enhancement of bioelectrochemical photocurrent harvesting using electrodes with porosities on the nano- and micrometer length-scale. For the cyanobacteria Nostoc punctiforme and Synechocystis sp. PCC6803 on structured indium-tin-oxide electrodes, an increase in current generation by two orders of magnitude is observed compared to a non-porous electrode. In addition, the photo-response is substantially faster compared to non-porous anodes. Electrodes with large enough mesopores for the cells to inhabit show only a small advantage over purely nanoporous electrode morphologies, suggesting the prevalence of a redox shuttle mechanism in the electron transfer from the bacteria to the electrode over a direct conduction mechanism. Our results highlight the importance of electrode nano-porosity in the design of electrochemical bio-interfaces.
Biofilms, Nostoc, Synechocystis, Shewanella, Tin Compounds, Photosystem I Protein Complex, Photosystem II Protein Complex, Electrodes, Electricity, Photosynthesis, Electron Transport, Oxidation-Reduction, Electric Conductivity, Light, Porosity, Electrochemical Techniques
Leverhulme Trust (RPG-2015-393)
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External DOI: https://doi.org/10.1038/s41467-018-03320-x
This record's URL: https://www.repository.cam.ac.uk/handle/1810/275019
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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