Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04613-x
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Funding
- I-CORE Program of the Planning and Budgeting Committee
- Israel Science Foundation [152/11]
- transformative program of the US-Israel Binational Science Foundation (BSF) [2011556]
- Deutsche Forschungsgemeinschaft (DIP project) [LU315/17-1]
- Nancy & Stephen Grand Technion Energy Program (GTEP)
- Israeli Ministry of Science, Technology and Space
- Schulich Graduate fellowship
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Oxygenic photosynthetic organisms perform solar energy conversion of water and CO2 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.
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