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A LiTa0.5Nb0.5O3/g-C3N4 photocatalyst was used in a single-chamber microbial fuel cell to increase power generation under light irradiation, achieving a maximal power density of 667.7 mW/m³.

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What they did

System
MFC

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Abstract

Abstract Microbial fuel cells (MFCs) have attracted a great deal of attention as a promising technology for recovering electricity from organic substances by harnessing the metabolic activities of microorganisms. The objective of this study is to assess the efficacy of a LiTa 0.5 Nb 0.5 O 3 /g-C 3 N 4 (LTN/g-C 3 N 4 ) heterojunction as a photocathode catalyst within a single-chamber microbial fuel cell operating under both light irradiation and dark conditions. X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Energy dispersive X-Ray spectroscopy (EDS) were used to conduct a comprehensive analysis of the composite catalyst, revealing its exceptional purity and unique properties. After 120 h of exposure to visible light, the maximal power density of the MFC containing LTN/g-C3N4-modified carbon cloth was determined to be 667.7 mW/m 3 . The power density achieved with the presence of light was approximately three times greater than the power density obtained without light in the MFC (235.64 mW/m 3 ). In addition, the study determined that the removal efficiencies of chemical oxygen demand (COD) were 88.4% and 66.5% when exposed to light and in the absence of light, respectively. These findings highlight the potential of the non-precious LTN/g-C 3 N 4 photocatalyst as a viable alternative for effective wastewater treatment and power generation in microbial fuel cells with a single chamber configuration.

Key findings

  • The LTN/g-C3N4 heterojunction showed exceptional purity and unique properties.
  • The power density achieved with the presence of light was approximately three times greater than the power density in dark conditions.
  • The maximal power density of the MFC containing LTN/g-C3N4-modified carbon cloth was 667.7 mW/m³ after 120 h of exposure to visible light.

Keywords

Microbial fuel cellPower densityPhotocatalysisFourier transform infrared spectroscopyElectricity generationChemical oxygen demand

Identifiers

DOI
10.1007/s40243-024-00259-6
Journal
Materials for Renewable and Sustainable Energy
Year
2024