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Title (Primary) Technical-scale biophotovoltaics for long-term photo-current generation from Synechocystis sp. PCC6803
Author Lai, B.; Schneider, H.; Tschörtner, J.; Schmid, A.; Krömer, J.O.;
Journal Biotechnology and Bioengineering
Year 2021
Department SOMA;
Volume 118
Issue 7
Language englisch;
POF III (all) R61;
Supplements https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fbit.27784&file=bit27784-sup-0001-Supplimentary_materials.docx
Keywords Bioelectrochemical systems; cyanobacteria; microbial electrochemical technology; BG11 medium; system design
Abstract A carbon‐free energy supply is essential to sustain our future. Biophotovoltaics (BPV) provides a promising solution for hydrogen supply by directly coupling light‐driven water splitting to hydrogen formation using oxygenic photoautotrophic cyanobacteria. However, BPV is currently limited by its low photon‐to‐current efficiency, and current experimental setups at a miniaturized scale hinder the rational investigation of the process and thus system optimization. In this paper, we developed and optimized a new technical‐scale (~250ml working volume) BPV platform with defined and controllable operating parameters. Factors that interfered with reproducible and stable current output signals were identified and adapted. We found that the classical BG11 medium, used for the cultivation of cyanobacteria and also in many BPV studies, caused severe interferences in the bioelectrochemical experiments. An optimized nBG11 medium guaranteed a low and stable background current in the BPV reactor, regardless of the presence of light and/or mediators. As proof‐of‐principle, a very high long‐term light‐dependent current output (peak current of over 20 µA) was demonstrated in the new set‐up over 12 days with living Synechocystis sp PCC6803 cells and validated with appropriate controls. These results report the first reliable BPV platform generating reproducible photocurrent while still allowing quantitative investigation, rational optimization, and scale‐up of BPV processes.
ID 24030
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24030
Lai, B., Schneider, H., Tschörtner, J., Schmid, A., Krömer, J.O. (2021):
Technical-scale biophotovoltaics for long-term photo-current generation from Synechocystis sp. PCC6803
Biotechnol. Bioeng. 118 (7), 2637 - 2648