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

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  • Chenhui Yang, Harbin Institute of Technology
  • ,
  • Hüsnü Aslan
  • ,
  • Peng Zhang, Harbin Institute of Technology
  • ,
  • Shoujun Zhu, National Institutes of Health, Bethesda
  • ,
  • Yong Xiao, Chinese Academy of Sciences, Institute of Urban Environment
  • ,
  • Lixiang Chen, Chinese Academy of Sciences, Institute of Urban Environment
  • ,
  • Nasar Khan
  • ,
  • Thomas Boesen
  • 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
  • Feng Zhao, Chinese Academy of Sciences, Institute of Urban Environment
  • ,
  • Miao Yu, Harbin Institute of Technology

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.

Original languageEnglish
Article number1379
JournalNature Communications
Number of pages11
Publication statusPublished - 2020

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