Carbon dots-fed Shewanella oneidensis MR-1 for bioelectricity enhancement

Chenhui Yang, Hüsnü Aslan, Peng Zhang, Shoujun Zhu, Yong Xiao, Lixiang Chen, Nasar Khan, Thomas Boesen, Yuanlin Wang, Yang Liu, Lei Wang, Ye Sun (), Yujie Feng (), Flemming Besenbacher (), Feng Zhao () and Miao Yu ()
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Chenhui Yang: Harbin Institute of Technology
Hüsnü Aslan: Aarhus University
Peng Zhang: Harbin Institute of Technology
Shoujun Zhu: National Institutes of Health (NIH)
Yong Xiao: Chinese Academy of Sciences
Lixiang Chen: Chinese Academy of Sciences
Nasar Khan: Aarhus University
Thomas Boesen: Aarhus University
Yuanlin Wang: Harbin Institute of Technology
Yang Liu: Harbin Institute of Technology
Lei Wang: Harbin Institute of Technology
Ye Sun: Harbin Institute of Technology
Yujie Feng: Harbin Institute of Technology
Flemming Besenbacher: Aarhus University
Feng Zhao: Chinese Academy of Sciences
Miao Yu: Harbin Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Bioelectricity generation, by Shewanella oneidensis (S. oneidensis) MR-1, has become particularly alluring, thanks to its extraordinary prospects for energy production, pollution treatment, and biosynthesis. Attempts to improve its technological output by modification of S. oneidensis MR-1 remains complicated, expensive and inefficient. Herein, we report on the augmentation of S. oneidensis MR-1 with carbon dots (CDs). The CDs-fed cells show accelerated extracellular electron transfer and metabolic rate, with increased intracellular charge, higher adenosine triphosphate level, quicker substrate consumption and more abundant extracellular secretion. Meanwhile, the CDs promote cellular adhesion, electronegativity, and biofilm formation. In bioelectrical systems the CDs-fed cells increase the maximum current value, 7.34 fold, and power output, 6.46 fold. The enhancement efficacy is found to be strongly dependent on the surface charge of the CDs. This work demonstrates a simple, cost-effective and efficient route to improve bioelectricity generation of S. oneidensis MR-1, holding promise in all relevant technologies.

Date: 2020
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DOI: 10.1038/s41467-020-14866-0

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