MESSAI.iO

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This study investigates the performance of microfluidic microbial fuel cells (MFCs) by examining electron transfer mechanisms, metal-based electrodes, and the effect of a static magnetic field. The results show a significant improvement in generated bioelectricity, with a maximum open circuit potential, current density, and power density of 1.39 V, 138,181 mA m⁻², and 35,294 mW m⁻², respectively. The produced current density is at least 445% better than previously published values.

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What they did

System
MFC
Substrate
complex media

What worked

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Abstract

Abstract The presented paper fundamentally investigates the influence of different electron transfer mechanisms, various metal-based electrodes, and a static magnetic field on the overall performance of microfluidic microbial fuel cells (MFCs) for the first time to improve the generated bioelectricity. To do so, as the anode of microfluidic MFCs, zinc, aluminum, tin, copper, and nickel were thoroughly investigated. Two types of bacteria, Escherichia coli and Shewanella oneidensis MR-1 , were used as biocatalysts to compare the different electron transfer mechanisms. Interaction between the anode and microorganisms was assessed. Finally, the potential of applying a static magnetic field to maximize the generated power was evaluated. For zinc anode, the maximum open circuit potential, current density, and power density of 1.39 V, 138,181 mA m -2 and 35,294 mW m -2 were obtained, respectively. The produced current density is at least 445% better than the values obtained in previously published studies so far. The microfluidic MFCs were successfully used to power ultraviolet light-emitting diodes (UV-LEDs) for medical and clinical applications to elucidate their application as micro-sized power generators for implantable medical devices.

Key findings

  • Zinc anode showed the highest performance with a maximum open circuit potential of 1.39 V
  • The use of a static magnetic field can maximize the generated power
  • Escherichia coli and Shewanella oneidensis MR-1 bacteria exhibited different electron transfer mechanisms

Keywords

Shewanella oneidensisMicrobial fuel cellAnodeMicrofluidicsElectrodeOptoelectronics

Identifiers

DOI
10.1038/s41598-022-11472-6
Journal
Scientific Reports
Year
2022