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A biophotoelectrochemical approach to unravelling the role of cyanobacterial cell structures in exoelectrogenesis

Wey, Laura T.; Lawrence, Joshua M.; Chen, Xiaolong; Clark, Robert; Lea-Smith, David J.; Zhang, Jenny Z.; Howe, Christopher J.

Authors

Laura T. Wey

Joshua M. Lawrence

Dr XIAOLONG CHEN XIAOLONG.CHEN@NOTTINGHAM.AC.UK
Assistant Professor in Sustainable Engineering

Robert Clark

David J. Lea-Smith

Jenny Z. Zhang

Christopher J. Howe



Abstract

Photosynthetic microorganisms can export electrons outside their cells, a phenomenon called exoelectrogenesis, which can be harnessed for solar energy conversion. However, the route electrons take from thylakoid membranes to the cell exterior is not understood. Electrochemistry is a powerful analytical technique for studying electron transfer pathways. Here, we show how photoelectrochemistry can be used to compare electron flux from cyanobacterial cells of different growth stages, species and with the outer layers systematically removed. We show that the periplasmic space contributes significantly to the photocurrent profile complexity of whole cells, indicating that it gates electron transfer in exoelectrogenesis. We found that although components of the type IV pili machinery do not have a role in exoelectrogenesis, they contribute significantly to cell-electrode adherence. This study establishes that analytical photoelectrochemistry and molecular microbiology provide a powerful combination to study exoelectrogenesis, enabling future studies to answer biological questions and advance solar energy conversion applications.

Citation

Wey, L. T., Lawrence, J. M., Chen, X., Clark, R., Lea-Smith, D. J., Zhang, J. Z., & Howe, C. J. (2021). A biophotoelectrochemical approach to unravelling the role of cyanobacterial cell structures in exoelectrogenesis. Electrochimica Acta, 395, Article 139214. https://doi.org/10.1016/j.electacta.2021.139214

Journal Article Type Article
Acceptance Date Aug 31, 2021
Online Publication Date Sep 6, 2021
Publication Date Nov 1, 2021
Deposit Date Aug 3, 2023
Journal Electrochimica Acta
Print ISSN 0013-4686
Electronic ISSN 1873-3859
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 395
Article Number 139214
DOI https://doi.org/10.1016/j.electacta.2021.139214
Keywords Electrochemistry; General Chemical Engineering
Public URL https://nottingham-repository.worktribe.com/output/23787838
Publisher URL https://www.sciencedirect.com/science/article/pii/S0013468621015048