Impact of modified electrodes on boosting power density of microbial fuel cell for effective domestic wastewater treatment:A case study of Tehran
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Abstract: Utilizing microbial fuel cells (MFCs) is a promising technology for energy-efficient domestic wastewater treatment, but it still faces practical barriers such as low power generation. In this study, the LaMnO3 perovskite-type oxide nanoparticles and nickel oxide/carbon nanotube/polyaniline (NCP) nanocomposite (the cathode and anode catalysts, respectively) have been prepared and used to enhance power density of MFC. The prepared La-based perovskite oxide catalysts were characterized by X-ray diffraction (XRD) and scanning electron microscopies (SEM). The electrocatalytic properties of the prepared catalysts were investigated through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) and Tafel plot at ambient temperature. Results show the exchange current densities of LaMnO3/carbon cloth cathode and NCP nanocomposite/carbon cloth anode were 1.68 and 7 times more compared to carbon cloth cathode, respectively. In comparison to the bare carbon cloth anode, the MFC with the modified electrodes shows 11 times more enhancement in power density output which according to electrochemical results, it can be due to the enhancement of the electron transfer capability. These cathodic and anodic catalysts were examined in batch and semi-continuous modes to provide conditions close to industrial conditions. This study suggests that utilizing these low cost catalysts has promising potential for wastewater treatment in MFC with high power generation and good COD removal efficiency.
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Key words:
- carbon nanotube /
- nickle oxide /
- La-based perovskite oxide /
- semi-continuous mode
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Figure 4 Nyquist plots on (a) NCP nanocomposite anode and BCC anode in an anaerobic domestic wastewater, (b) LaMnO3 perovskite oxide cathode and BCC cathode in an anaerobic domestic wastewater
Figure 5 Cyclic voltammograms of (a) NCP nanocomposite anode and BCC anode in an anaerobic domestic wastewater, (b) LaMnO3 perovskite oxide cathode and BCC cathode in an anaerobic domestic wastewater
Figure 6 Tafel plots of (a) NCP nanocomposite anode and BCC anode in an anaerobic domestic wastewater, (b) LaMnO3 perovskite oxide cathode and BCC cathode in an anaerobic domestic wastewater at scan rate 1 mV/ S the inset figure is the linear fit for the Tafel plots of overpotential from 100 to 150 mV
Figure 7 Polarization curve and power output of MFC in batch mode in the presence of both MCC cathode and anode
Figure 8 Potential-time curve of MFC utilizing nano-catalysts electrodes and BCC electrode vs. Ag/AgCl reference electrode
Table 1 Maximum power densities, maximum current densities and open circuit voltages (OCVs) at steady state (SS) condition of the MFC in batch mode
Table 2 Comparing of the MFCs in batch and semi-continuous mode
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