Anode and cathode materials characterization for a microbial fuel cell in half cell configuration.

Area of Science:

• Bioelectrochemical Systems
• Renewable Energy
• Environmental Biotechnology

Background:

• Microbial fuel cells (MFCs) convert biomass to electricity via bacterial metabolism.
• MFCs offer potential for bioenergy from organic wastes but face material cost and performance variability challenges.
• Standardized material testing is needed for comparable MFC performance data.

Purpose of the Study:

• To assess the suitability of commercially available materials as anodes in acetate-fed MFCs.
• To evaluate a novel non-platinized activated carbon (AC) based air cathode.
• To investigate the impact of acetate concentration on anode performance.

Main Methods:

• Tested carbon cloth, graphite cloth, and dynamically stable anode (DSA) as anode materials in a half-cell configuration.
• Measured open circuit voltage (OCV) for acetate oxidation.
• Evaluated a novel AC air cathode for current generation stability over 100 days.

Main Results:

• Carbon cloth and graphite cloth proved suitable anode materials, reaching the OCV for acetate oxidation (-500 mV vs. Ag/AgCl).
• Anode performance was unaffected by acetate concentrations ranging from 10 mM to 40 mM.
• The AC cathode maintained a stable current density of -1.2 mA/cm² for 100 days.

Conclusions:

• Commercially available materials like carbon cloth and graphite cloth are viable anode options for MFCs.
• The novel AC air cathode shows promise for stable and long-term electricity generation in MFC applications.
• Further research into cost-effective materials is crucial for the economic viability of MFC technology.