Abstract:
:Oxygenic photosynthetic organisms perform solar energy conversion of water and CO2 to O2 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Saper G,Kallmann D,Conzuelo F,Zhao F,Tóth TN,Liveanu V,Meir S,Szymanski J,Aharoni A,Schuhmann W,Rothschild A,Schuster G,Adir Ndoi
10.1038/s41467-018-04613-xsubject
Has Abstractpub_date
2018-06-04 00:00:00pages
2168issue
1issn
2041-1723pii
10.1038/s41467-018-04613-xjournal_volume
9pub_type
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