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Air Breathing Cathodes for Microbial Fuel Cell using Mn-, Fe-, Co- and Ni-containing Platinum Group Metal-free Catalysts

View Article: PubMed Central - PubMed

ABSTRACT

PGM-free catalysts were synthesized using sacrificial support method.

Catalysts were made with Fe, Co, Mn and Ni as metal center and AAPyr as precursor.

Fe-catalysts showed highest performance for ORR in microbial fuel cell.

Increase in solution conductivity led to a maximum power of 482 ± 5 μWcm−2

Increase in solution conductivity led to a maximum power of 482 ± 5 μWcm−2

No MeSH data available.


Peak of power density function of the electrolyte solution conductivity.
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fig0045: Peak of power density function of the electrolyte solution conductivity.

Mentions: As it was discussed above, Fe-AAPyr was identified as the most active electro-catalyst among the materials investigated for ORR incorporated into an air-breathing cathode operating in MFC. In this paragraph, the performances of SCMFCs using Fe-AAPyr as cathode catalyst have been investigated varying the solution conductivity of the electrolyte simulating real wastewaters. Particularly, the solution conductivity varied between 12.38 mS cm−1 and 63.1 mS cm−1. Results showed that the performances increased significantly with the increase in solution conductivity (Fig. 8). Polarization curves showed practically the same open circuit voltage with starting point of 0.742 ± 0.021 V (Fig. 8.a). Different slopes in the polarization curves were identified with the increase in solution conductivity (Fig. 8.a). Separate electrodes polarization curves showed that both anode and cathode polarization curves are positively affected by the electrolyte conductivity (Fig. 8.b and 8.c). In fact, both anode and cathode polarization curves changed their linear slopes positively with the increase in solution conductivity indicating a decrease in ohmic losses with electrolyte conductivity (Fig. 8.b and 8.c). Interestingly, both anode and cathode do not reach diffusion limitation indicating the ohmic losses due to the electrolyte as the main cause of the overall losses. Power density output was then affected positively by the increase in solution conductivity (Fig. 8.d). Results about the power densities obtained are summarized in Table 1. The maximum power recorded was 482 ± 5 μW cm−2 for solution conductivity of 63.1 mS cm−1 (Fig. 8.d). A quasi-linear increase of the power peak with the solution conductivity in the range investigated can be noticed (Fig. 9). These results underline the important aspect that the performances of the MFCs are electrolyte limited. In fact, the increase in solution conductivity of the electrolyte led to an increase in output.


Air Breathing Cathodes for Microbial Fuel Cell using Mn-, Fe-, Co- and Ni-containing Platinum Group Metal-free Catalysts
Peak of power density function of the electrolyte solution conductivity.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384433&req=5

fig0045: Peak of power density function of the electrolyte solution conductivity.
Mentions: As it was discussed above, Fe-AAPyr was identified as the most active electro-catalyst among the materials investigated for ORR incorporated into an air-breathing cathode operating in MFC. In this paragraph, the performances of SCMFCs using Fe-AAPyr as cathode catalyst have been investigated varying the solution conductivity of the electrolyte simulating real wastewaters. Particularly, the solution conductivity varied between 12.38 mS cm−1 and 63.1 mS cm−1. Results showed that the performances increased significantly with the increase in solution conductivity (Fig. 8). Polarization curves showed practically the same open circuit voltage with starting point of 0.742 ± 0.021 V (Fig. 8.a). Different slopes in the polarization curves were identified with the increase in solution conductivity (Fig. 8.a). Separate electrodes polarization curves showed that both anode and cathode polarization curves are positively affected by the electrolyte conductivity (Fig. 8.b and 8.c). In fact, both anode and cathode polarization curves changed their linear slopes positively with the increase in solution conductivity indicating a decrease in ohmic losses with electrolyte conductivity (Fig. 8.b and 8.c). Interestingly, both anode and cathode do not reach diffusion limitation indicating the ohmic losses due to the electrolyte as the main cause of the overall losses. Power density output was then affected positively by the increase in solution conductivity (Fig. 8.d). Results about the power densities obtained are summarized in Table 1. The maximum power recorded was 482 ± 5 μW cm−2 for solution conductivity of 63.1 mS cm−1 (Fig. 8.d). A quasi-linear increase of the power peak with the solution conductivity in the range investigated can be noticed (Fig. 9). These results underline the important aspect that the performances of the MFCs are electrolyte limited. In fact, the increase in solution conductivity of the electrolyte led to an increase in output.

View Article: PubMed Central - PubMed

ABSTRACT

PGM-free catalysts were synthesized using sacrificial support method.

Catalysts were made with Fe, Co, Mn and Ni as metal center and AAPyr as precursor.

Fe-catalysts showed highest performance for ORR in microbial fuel cell.

Increase in solution conductivity led to a maximum power of 482 ± 5 μWcm−2

Increase in solution conductivity led to a maximum power of 482 ± 5 μWcm−2

No MeSH data available.