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A microbial fuel cell using coconut shell biochar as an electrode was improved by combining oxidizing agents and microwave heating, resulting in a 30.89-fold increase in electrochemical properties.

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Representative MFC — matched on the paper’s system type only, not its reactor or geometry.

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Reported parameters

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What they did

System
MFC

What worked

Power density283mW/m²
Current density0.84A/m²

Abstract

A microbial fuel cell (MFC) is a green device that utilizes chemical energy in organic materials to generate electricity. The low-cost electrode used in this study was made from agricultural waste, coconut shells. The electrochemical properties were improved by combining oxidizing agents and microwave heating processes. The modified coconut shell electrode outperformed virgin biochar by 30.89-fold (230.13±10.11 m²/g). The maximum open-circuit voltage, current density, and power density are respectively 995.00±5.00 mV, 841.67±14.43 mA/m², and 283.42±9.67 mW/m². This study demonstrated that modified coconut shell biochar could be used as a low-cost alternative electrode for electricity generation.

Key findings

  • Modified coconut shell biochar outperformed virgin biochar by 30.89-fold in electrochemical properties.
  • Maximum open-circuit voltage reached 995.00±5.00 mV.
  • Maximum current density and power density reached 841.67±14.43 mA/m² and 283.42±9.67 mW/m², respectively.

Keywords

BiocharMicrobial fuel cellOxidizing agentPower densityElectrodeElectrochemistry

Identifiers

DOI
10.15243/jdmlm.2022.094.3613
Journal
Journal of Degraded and Mining Lands Management
Year
2022