Cu/TiO₂ nanoparticles: Enhancing microbial fuel cell performance as photocathode catalysts

Area of Science:

• Materials Science
• Electrochemistry
• Environmental Science

Background:

• Microbial fuel cells (MFCs) offer sustainable energy production and wastewater treatment.
• Developing efficient photocathode catalysts is crucial for enhancing MFC performance.
• Traditional catalysts like platinum (Pt) are expensive and have limitations.

Purpose of the Study:

• To synthesize and characterize Cu/TiO2 nanoparticles for MFC photocathode applications.
• To evaluate the performance of Cu/TiO2 as a photocathode catalyst in MFCs.
• To compare the efficiency of Cu/TiO2 with traditional Pt catalysts and control materials.

Main Methods:

• Cu/TiO2 nanoparticles with varying Cu loadings (1-4 wt%) were synthesized using low-temperature calcination.
• Materials were characterized for optical, electrochemical, and photocatalytic properties.
• Performance was evaluated in a photocatalytic microbial fuel cell (Photo-MFC) using methyl orange (MO) as a model pollutant.

Main Results:

• The 2 wt% Cu/TiO2 sample showed a 2.6x larger specific surface area and 26% higher MO degradation than pure TiO2.
• The Photo-MFC utilizing 2 wt% Cu/TiO2/SSWM achieved an open-circuit voltage of 790 mV and a power density of 312 mW·m-2.
• MO degradation efficiency reached 99%, significantly outperforming controls and demonstrating superior photocatalytic activity.

Conclusions:

• Cu/TiO2 nanoparticles are a cost-effective and high-performance alternative to Pt catalysts for MFC photocathodes.
• This material significantly enhances both power output and pollutant degradation efficiency in Photo-MFCs.
• The developed photocathode offers a promising solution for sustainable wastewater treatment applications.