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Two microbial fuel cells were stacked and tested under different electrical configurations, with the highest power output obtained under parallel connection.

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What they did

System
MFC
Substrate
pure compound

What worked

No outcome metrics extracted yet.

Abstract

Two identical four air-cathode single chamber membrane-less microbial fuel cells were stacked and tested under in series and in parallel electrical configurations. Fermentable household waste extract (FORBI; 0.8 g COD/L) was used as substrate, in all cases. Linear Sweep Voltammetry (LSV) was carried out for the construction of polarization curves which revealed that the highest power ouput (3.88 mW) was obtained under parallel connection as in series connection was found lower due to voltage drop phenomena. Electrochemical Impedance Spectroscopy measurements (EIS) gave an insight in the electrochemical processes occurring within the stack under both electrical connections. The contribution of the individual resistances to the overall internal resistance was defined, designating the significant role of the solution resistance (Rs) and the charge transfer resistance (RCT) under closed circuit conditions.

Key findings

  • Highest power output (3.88 mW) was obtained under parallel connection.
  • Voltage drop phenomena caused lower power output in series connection.
  • Solution resistance (Rs) and charge transfer resistance (RCT) play significant roles in the overall internal resistance.

Keywords

Microbial fuel cellDielectric spectroscopyLinear sweep voltammetryStack (abstract data type)Voltage dropElectrochemistry

Identifiers

DOI
10.30955/gnj.002996
Journal
Global NEST Journal
Year
2019