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Increasing mediator concentration up to 1.66×10⁻¹ mmol/L improves MFC performance, but excessive concentration (2.50×10⁻¹ mmol/L) decreases it.

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What they did

System
MFC

What worked

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Abstract

Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), power density and anode potential are used to characterize the mediator microbial fuel cell at different methylene blue (MB) concentrations. At lower MB concentration between 9.98×10⁻³ mmol/L and 1.66×10⁻¹ mmol/L, the increased power density is enabled by using high mediator concentrations. Higher peak power density of 159.6 mw/m2 is observed compared with the peak power density of 36.0 mw/m2. But MB at too high concentration is disadvantageous to the perform of MFC. At the MB concentration of 2.50×10⁻¹ mmol/L, the peak power output is just 128.4 mw/m2, which is lower than 159.6 mw/m2 at MB concentration of 1.66×10⁻¹ mmol/L.

Key findings

  • Higher peak power density (159.6 mw/m2) is achieved at MB concentration of 1.66×10⁻¹ mmol/L compared to 36.0 mw/m2.
  • Power density increases with increasing mediator concentration up to 1.66×10⁻¹ mmol/L.
  • Excessive MB concentration (2.50×10⁻¹ mmol/L) reduces peak power output to 128.4 mw/m2.

Keywords

Microbial fuel cellPower densityDielectric spectroscopyAnodeCyclic voltammetryMethylene blue

Identifiers

DOI
10.4028/www.scientific.net/amr.512-515.1520
Journal
Advanced Materials Research
Year
2012