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First steps towards a constructal Microbial Fuel Cell.

Guillaume Lepage1, Gérard Perrier1, Julien Ramousse1

  • 1Laboratoire Optimisation de la Conception et Ingénierie de l'Environnement, CNRS UMR 5271, Université de Savoie, Polytech Annecy-Chambéry, 73376 Le Bourget du Lac, France.

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Summary

A novel multi-channel reactor for Microbial Fuel Cells (MFCs) was designed using constructal theory to optimize organic charge flow and reduce entropy generation, demonstrating robust efficiency.

Keywords:
Bioelectrochemical systemConstructal designEntropy generationMicrobial Fuel Cell

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Area of Science:

  • Energy Conversion and Storage
  • Electrochemistry
  • Fluid Dynamics

Background:

  • Microbial Fuel Cells (MFCs) are promising for sustainable energy generation.
  • Optimizing reactor design is crucial for enhancing MFC performance and real-world applicability.
  • Organic charge flow and entropy generation are key factors affecting MFC efficiency.

Purpose of the Study:

  • To design and optimize a multi-channel reactor for Microbial Fuel Cells (MFCs) under real operating conditions.
  • To apply constructal theory for minimizing entropy generation in the fluid distribution system.
  • To evaluate the efficiency and robustness of the designed MFC.

Main Methods:

  • A two-dimensional, feed-through double chamber reactor with four parallel channels was designed.
  • Reticulated Vitreous Carbon was used as electrodes.
  • Thermodynamical calculations and Hess-Murray law were employed to optimize the constructal-inspired distributor.
  • Entropy generation was determined based on global hydraulic resistance.

Main Results:

  • The constructal-inspired design effectively reduced entropy generation along the distributing path.
  • Polarization, power, and Electrochemical Impedance Spectroscopy (EIS) confirmed the cell's robustness and efficiency.
  • The study demonstrated the potential of the constructal approach in MFC design.

Conclusions:

  • The optimized multi-channel MFC reactor shows significant potential for efficient organic charge flow.
  • Constructal theory provides a valuable framework for improving MFC design and performance.
  • Further design evolutions can lead to enhanced MFC systems.