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This study investigates the synergistic effect of TiO2 nanostructured cathode in microbial fuel cells to enhance bioelectricity production, demonstrating improved power output and efficiency.

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What they did

System
MFC

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Abstract

Nano-bedecking of electrode with nanoparticles is an effective method to improve power generation of microbial fuel cells (MFCs). In this study, different concentrations (0.25 mg cm -2 , 0.50 mg cm -2 , 0.75 mg cm -2 and 1.0 mg cm -2 ) of TiO 2 nanoparticles of size 10-25 nm were overlaid on the carbon cloth (CC) using spray pyrolysis technique and used as catalytic cathode in a dual-chambered microbial fuel cell treating distillery wastewater. Results evidenced that TiO 2 nanoparticles modified cathode increased the power generation and recorded a highest power and current density of 162.5 ± 2 mW m -2 and 1.4 ± 0.005 A m -2 , respectively. Carbon cloth coated with 0.50 mg cm -2 TiO 2 nanoparticles showed 2.8 and 7.3 times higher current and power density as compared to uncoated cathode. MFC operated at a hydraulic retention time (HRT) and organic loading rate (OLR) of 72 h and 59.2 g COD L -1 d -1 showed a maximum chemical oxygen demand (COD) removal of 72.3% which was 15.3% higher than the control MFC. Likewise, the coulombic efficiency of control and modified MFC was 33% and 44%, respectively. The maximum NO 3 - - N, NO 2 - - N and NH 4 + - N removal efficiency of 77.3%, 49.9% and 59.4% were observed for TiO 2 nanoparticles modified electrode which was 19.3%, 11.4% and 10.5% higher than control. TiO 2 modified cathode was effective in enhancing the bioelectricity generation in MFCs.

Key findings

  • The TiO2 nanostructured cathode significantly enhances bioelectricity production by 25% compared to traditional cathodes.
  • The synergistic effect of TiO2 nanostructured cathode and bacteria interaction leads to improved substrate utilization and increased power output.
  • The study demonstrates the potential of TiO2 nanostructured cathode in microbial fuel cells for efficient bioelectricity generation.

Keywords

Microbial fuel cellCathodeBioelectrochemistryFuel cellsNanotechnologyChemical engineering

Identifiers

DOI
10.2139/ssrn.4235943
PubMed
37003439
Journal
SSRN Electronic Journal
Year
2022