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<p>A microbial fuel cell (MFC) is a sustainable and an environmental eco-friendly system which is utilized for treatment of waste and bioelectricity generation simultaneously, using bio-catalytic activity of microorganisms. Its reliability has been tested using fruit biomass as substrate. The MFC consists of two compartments: anolyte contains fruit biomass for biofilm formation, while catholyte contains one of electron acceptors O<sub>2</sub> or K<sub>3</sub>Fe(CN)<sub>6</sub>. Owing to its electrochemical catalytic activity, a layered double hydroxide (LDH) was used to modify the matrix of carbon felt (CF), resulting in conductive cathode with enhanced power generation capacity. The electrode performances of LDH-based electrodes were investigated by cyclic voltammetry and impedance spectroscopy. The MFC with K<sub>3</sub>Fe(CN)<sub>6</sub> as catholyte and CF–LDH as modified cathode yielded the power density 132.31&#xa0;mW.m<sup>−2</sup> much greater than that obtained previously with HCl and pristine CF (i.e., 25.0&#xa0;mWm<sup>−2</sup>). Furthermore, the toxic K<sub>3</sub>Fe(CN)<sub>6</sub> was substituted by less toxic electrolytes MgCl<sub>2</sub> and AlCl<sub>3</sub>. The MFCs displayed power densities 9.84 and 12.0&#xa0;mWm<sup>−2</sup> for MgCl<sub>2</sub> and AlCl<sub>3</sub>, respectively. Within experimental error, the power density obtained in this study by AlCl<sub>3</sub> and MgAl-CF–LDH (i.e., 12.0&#xa0;mWm<sup>−2</sup>) was twofold higher than that found previously using NiAl-CF–LDH (6.0&#xa0;mWm<sup>−2</sup>). The substitution of the transition metal nickel by the alkaline earth metal magnesium increased greatly the power generation. The results confirmed the reliability of MFC technology for treatment of fruit wastes by using the superior catalytic LDH-based composite as cathode for the O<sub>2</sub> reduction reaction.</p>

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Improvement of microbial fuel cell performance using LDH-based electrodes

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Amina Elhaci,
  • Mostefa Kameche,
  • Halima Founas,
  • Meriem Djellali,
  • Abdelkader Benderrag

摘要

A microbial fuel cell (MFC) is a sustainable and an environmental eco-friendly system which is utilized for treatment of waste and bioelectricity generation simultaneously, using bio-catalytic activity of microorganisms. Its reliability has been tested using fruit biomass as substrate. The MFC consists of two compartments: anolyte contains fruit biomass for biofilm formation, while catholyte contains one of electron acceptors O2 or K3Fe(CN)6. Owing to its electrochemical catalytic activity, a layered double hydroxide (LDH) was used to modify the matrix of carbon felt (CF), resulting in conductive cathode with enhanced power generation capacity. The electrode performances of LDH-based electrodes were investigated by cyclic voltammetry and impedance spectroscopy. The MFC with K3Fe(CN)6 as catholyte and CF–LDH as modified cathode yielded the power density 132.31 mW.m−2 much greater than that obtained previously with HCl and pristine CF (i.e., 25.0 mWm−2). Furthermore, the toxic K3Fe(CN)6 was substituted by less toxic electrolytes MgCl2 and AlCl3. The MFCs displayed power densities 9.84 and 12.0 mWm−2 for MgCl2 and AlCl3, respectively. Within experimental error, the power density obtained in this study by AlCl3 and MgAl-CF–LDH (i.e., 12.0 mWm−2) was twofold higher than that found previously using NiAl-CF–LDH (6.0 mWm−2). The substitution of the transition metal nickel by the alkaline earth metal magnesium increased greatly the power generation. The results confirmed the reliability of MFC technology for treatment of fruit wastes by using the superior catalytic LDH-based composite as cathode for the O2 reduction reaction.