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Microbial-Inspired Surface Patterning for Selective Bacterial Actions for Enhanced Performance in Microbial Fuel

Babu Indira Bijimol1, Bhuvanendran Revamma Sreelekshmy2, Krishnan Nair Satheesh Kumar3

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Area of Science:

  • Bio-electrochemical systems
  • Surface science
  • Microbial fuel cells

Background:

  • Electrode-microbial interactions are crucial for bio-electrochemical system performance.
  • Bacterial attachment and biofilm formation are influenced by electrode surface properties.
  • Selective bacterial adhesion is necessary to prevent energy loss from non-specific interactions.

Purpose of the Study:

  • To develop microbial-patterned graphite scaffolds for selective bacterial-electrode interactions.
  • To investigate the impact of patterned surfaces on microbial fuel cell performance.
  • To establish a correlation between surface characteristics and electrochemical performance.

Main Methods:

  • Mechanical pre-treatment and bacterial patterning of graphite electrodes.
  • Characterization of surface topography and surface area (127.12 m²/g).
  • Symbolic regression and genetic algorithms for correlating surface and electrochemical properties.

Main Results:

  • Achieved a power density of 1105 mW/m², a threefold increase compared to pristine graphite (370 mW/m²).
  • Created a cobblestone topography with enhanced active sites for bacterial intercalation.
  • Demonstrated reduced surface potential and resistance due to bacterial intercalation, improving electron transfer.

Conclusions:

  • Bacterial-inspired surface patterning on anodes is critical for microbial fuel cell performance.
  • Optimized electrode-microbial interactions via selective patterning significantly enhance energy output.
  • The developed method provides a unique approach for designing efficient bio-electrochemical systems.