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Live cyanobacteria produce photocurrent and hydrogen using both the respiratory and photosynthetic systems

Oxygenic photosynthetic organisms perform solar energy conversion of water and CO(2) to O(2) and sugar at a broad range of wavelengths and light intensities. These cells also metabolize sugars using a respiratory system that functionally overlaps the photosynthetic apparatus. In this study, we descr...

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Detalles Bibliográficos
Autores principales: Saper, Gadiel, Kallmann, Dan, Conzuelo, Felipe, Zhao, Fangyuan, Tóth, Tünde N., Liveanu, Varda, Meir, Sagit, Szymanski, Jedrzej, Aharoni, Asaph, Schuhmann, Wolfgang, Rothschild, Avner, Schuster, Gadi, Adir, Noam
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5986869/
https://www.ncbi.nlm.nih.gov/pubmed/29867170
http://dx.doi.org/10.1038/s41467-018-04613-x
Descripción
Sumario:Oxygenic photosynthetic organisms perform solar energy conversion of water and CO(2) to O(2) and sugar at a broad range of wavelengths and light intensities. These cells also metabolize sugars using a respiratory system that functionally overlaps the photosynthetic apparatus. In this study, we describe the harvesting of photocurrent used for hydrogen production from live cyanobacteria. A non-harmful gentle physical treatment of the cyanobacterial cells enables light-driven electron transfer by an endogenous mediator to a graphite electrode in a bio-photoelectrochemical cell, without the addition of sacrificial electron donors or acceptors. We show that the photocurrent is derived from photosystem I and that the electrons originate from carbohydrates digested by the respiratory system. Finally, the current is utilized for hydrogen evolution on the cathode at a bias of 0.65 V. Taken together, we present a bio-photoelectrochemical system where live cyanobacteria produce stable photocurrent that can generate hydrogen.