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Comparing terracotta and earthenware for multiple functionalities in microbial fuel cells.

Jonathan Winfield1, John Greenman, David Huson

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Earthenware and terracotta show promise for microbial fuel cells (MFCs). Porous earthenware offers better power output, especially with continuous cathode hydration, making MFCs more self-sufficient.

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Area of Science:

  • Biosystems Engineering
  • Electrochemistry
  • Materials Science

Background:

  • Microbial fuel cells (MFCs) offer a sustainable energy source.
  • Ceramic materials like earthenware and terracotta are potential components for MFCs.
  • Optimizing MFC design is crucial for efficient and stable power generation.

Purpose of the Study:

  • To evaluate earthenware and terracotta for MFC applications.
  • To investigate the impact of structural properties (wall thickness, porosity) and cathode hydration on MFC performance.
  • To determine the optimal ceramic material and configuration for enhanced power production.

Main Methods:

  • Two MFC designs using earthenware and terracotta with varying wall thicknesses (4, 8, 18 mm) were tested.
  • Parameters analyzed included structural integrity, ion conductivity, porosity, and cathode hydration methods (continuous dripping vs. submersion).
  • Performance metrics such as open circuit voltage, current, and power output were measured over 6 weeks.

Main Results:

  • Earthenware, despite initial instability, demonstrated superior power production compared to denser terracotta.
  • Thicker earthenware walls (18 mm) initially yielded higher power, but differences diminished over time.
  • Cylindrical earthenware MFCs produced significantly higher current (75%) and power (33%) than terracotta.
  • Continuous dripping cathode hydration resulted in threefold higher power output than water submersion.

Conclusions:

  • Porous earthenware is a more effective material for MFC power generation than terracotta.
  • Optimized cathode hydration (continuous dripping) dramatically improves MFC efficiency.
  • MFCs utilizing earthenware membranes can achieve stable, high-maintenance-free operation, advancing biosystems engineering.