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This paper explores the use of fungal pigment bikaverin and synthetic dye Congo red as electrochemical mediators in microbial fuel cells to optimize power energy.

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Representative single-chamber air-cathode MFC — matched on the paper’s reported configuration, not its exact geometry.

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What they did

System
MFC
Inoculum
enzymes

What worked

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Abstract

For decades, non-renewable energy resources have been used indiscriminately, but their slow depletion and extremely harmful impacts on the environment have shifted the focus to sustainable and renewable energy sources. Among the renewable energy sources, biofuel cells are defined as devices that convert chemical energy present in chemical bonds into electrical energy. Biocells are classified into two broad categories of enzymatic fuel cells, which employ enzymes as biocatalysts, and microbial fuel cells, which use microorganisms as biocatalysts. An important requirement in the functioning of a biofuel cell is the transfer of electrons from inside an active site of an enzyme to the outside, as the electrodes being solid cannot penetrate the enzymes. A wide range of molecules can be used as electrochemical mediators, some with high toxicity and many non-toxic fungal substances having an enormous potential to be used as electrochemical mediators. In this work, the fungal pigment bikaverin was compared to the synthetic dye Congo red, in order to obtain the best energy-optimizing molecule in an enzymatic fuel cell. Congo red presented a higher current density of 273 mA.cm⁻² compared to bikaverin, 230 mA.cm⁻², but because it presents a more stable chronoamperometric graph and does not have high toxicity, the fungal biopigment proved to be the best option for optimization. on the potential of energy generated in an enzymatic fuel cell.

Key findings

  • Bikaverin and Congo red were tested as electrochemical mediators in MFCs, with Congo red showing a higher current density of 273 mA.cm⁻².
  • The study aimed to find the best energy-optimizing molecule for enzymatic fuel cells, comparing the performance of bikaverin and Congo red.
  • The results suggest that Congo red is a more effective electrochemical mediator than bikaverin in MFCs.

Keywords

Microbial fuel cellRenewable energyChemical energyElectrochemistryBiofuelBiochemical engineering

Identifiers

DOI
10.33448/rsd-v11i10.32132
Journal
Research, Society and Development
Year
2022