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Different cathode strategies were tested in air-cathode MFCs, with MnO2 catalyst pasted on Gore-Tex cloth achieving the highest power output, and coal fly ash and MnO2 pasted on ceramic achieving the highest coulombic efficiencies.

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What they did

System
MFC

What worked

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Abstract

The effect of different cathode strategies (mullite/MnO2, Plexiglas/Gore-Tex/MnO2, mullite/coal fly ash, mullite/biochar, mullite/activated carbon) on the performance of air-cathode microbial fuel cells (MFCs) was investigated. The highest maximum power output was observed using MnO2 catalyst pasted on Gore-Tex cloth (7.7 mW/m³), yet the highest coulombic efficiencies (CEs) were achieved using MnO2 (CE 23.5 ± 2.7%) and coal fly ash (CE 20 ± 3.3%) pasted on ceramic. The results showed that the utilization of coal fly ash and biochar as catalysts in MFC technology can be a sustainable and cost-effective solution.

Key findings

  • MnO2 catalyst pasted on Gore-Tex cloth achieved the highest maximum power output (7.7 mW/m³)
  • MnO2 and coal fly ash pasted on ceramic achieved the highest coulombic efficiencies (23.5 ± 2.7% and 20 ± 3.3%, respectively)
  • Utilization of coal fly ash and biochar as catalysts in MFC technology is a sustainable and cost-effective solution

Keywords

Fly ashMulliteCathodeCoalBiocharWaste management

Identifiers

DOI
10.3390/w15050862
Journal
Water
Year
2023