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Increased power generation in supercapacitive microbial fuel cell stack using Fe-N-C cathode catalyst.

Carlo Santoro1, Mounika Kodali1, Najeeb Shamoon1

  • 1Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM, 87131, USA.

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Summary
This summary is machine-generated.

This study integrates a microbial fuel cell (MFC) stack with a supercapacitor, using its electrodes for self-charging. The developed supercapacitive-MFC (SC-MFC) demonstrates robust performance and reproducibility over thousands of cycles.

Keywords:
Fe-based catalystGalvanostatic dischargesLong terms stabilityMicrobial fuel cellSupercapacitor

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Area of Science:

  • Electrochemistry
  • Energy Storage
  • Microbial Fuel Cells

Background:

  • Microbial fuel cells (MFCs) offer a sustainable energy source.
  • Integrating energy storage with MFCs is crucial for practical applications.
  • Supercapacitors provide high power density for intermittent energy demands.

Purpose of the Study:

  • To develop an internal self-charged supercapacitor within a microbial fuel cell (MFC) stack.
  • To investigate the electrochemical performance of a supercapacitive-MFC (SC-MFC).
  • To evaluate the impact of solution conductivity on SC-MFC performance.

Main Methods:

  • Constructed an SC-MFC using carbon veil as the negative electrode and activated carbon with a Fe-based catalyst as the positive electrode.
  • Performed galvanostatic discharges at various current and time pulses.
  • Tested SC-MFC performance across four different solution conductivities (2.5 to 40 mScm⁻¹).

Main Results:

  • SC-MFC exhibited decreasing equivalent series resistance (ESR) from 6.00 Ω to 3.42 Ω with increasing conductivity.
  • The positive electrode contributed 75-80% to the overall ESR.
  • Optimal performance was achieved at 40 mScm⁻¹ conductivity, yielding a maximum power of 36.9 mW (36.9 W m⁻³).
  • SC-MFC demonstrated robust reproducibility over 4520 cycles (8 days).

Conclusions:

  • The internal self-charging supercapacitor integrated within the MFC stack functions effectively.
  • Solution conductivity significantly impacts SC-MFC performance, particularly due to the positive electrode's potential.
  • The SC-MFC shows promise for stable and reproducible energy storage applications.