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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.


Rotating Disk Electrode Current measured for Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr and AC.
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fig0015: Rotating Disk Electrode Current measured for Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr and AC.

Mentions: Fig. 3 shows the linear sweep voltammograms obtained using a Rotating Disc Electrode (RDE) at 1600 RPM and 5 mV s−1 for the synthesized Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr catalysts as well as AC in the pH = 7.5 electrolyte saturated with O2 at room temperature. The current densities have been normalized to the geometric area of the electrode and potentials in the manuscript are referred to the Ag/AgCl (3 M KCl) electrode. It can be seen that among all synthesized transmission metal catalysts, Fe-AApyr has the highest onset potential of 0.31 V vs. Ag/AgCl. The half wave potentials of the transition metal catalysts also positively shifts from Ni-AApyr (-0.12 V vs. Ag/AgCl) to Fe-AApyr (+0.16 V vs. Ag/AgCl) according to the following trend: Ni-AApyr < Mn-AApyr < Co-AApyr <Fe-AApyr, summarized in Table 3. In contrast, activated carbon not only has the lowest onset and half wave potentials in comparison, but it also has the lowest limiting current densities, indicating that the presence of transition metal active centers are important for the efficient electroreduction of oxygen in neutral media. Among all the synthesized catalysts, Fe-AApyr has the highest electrochemical performance, which also corroborates the polarization curves obtained using MFCs operating with Fe-AApyr as a cathode catalyst.


Air Breathing Cathodes for Microbial Fuel Cell using Mn-, Fe-, Co- and Ni-containing Platinum Group Metal-free Catalysts
Rotating Disk Electrode Current measured for Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr and AC.
© Copyright Policy - CC BY
Related In: Results  -  Collection

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

fig0015: Rotating Disk Electrode Current measured for Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr and AC.
Mentions: Fig. 3 shows the linear sweep voltammograms obtained using a Rotating Disc Electrode (RDE) at 1600 RPM and 5 mV s−1 for the synthesized Mn-AAPyr, Fe-AAPyr, Co-AAPyr, Ni-AAPyr catalysts as well as AC in the pH = 7.5 electrolyte saturated with O2 at room temperature. The current densities have been normalized to the geometric area of the electrode and potentials in the manuscript are referred to the Ag/AgCl (3 M KCl) electrode. It can be seen that among all synthesized transmission metal catalysts, Fe-AApyr has the highest onset potential of 0.31 V vs. Ag/AgCl. The half wave potentials of the transition metal catalysts also positively shifts from Ni-AApyr (-0.12 V vs. Ag/AgCl) to Fe-AApyr (+0.16 V vs. Ag/AgCl) according to the following trend: Ni-AApyr < Mn-AApyr < Co-AApyr <Fe-AApyr, summarized in Table 3. In contrast, activated carbon not only has the lowest onset and half wave potentials in comparison, but it also has the lowest limiting current densities, indicating that the presence of transition metal active centers are important for the efficient electroreduction of oxygen in neutral media. Among all the synthesized catalysts, Fe-AApyr has the highest electrochemical performance, which also corroborates the polarization curves obtained using MFCs operating with Fe-AApyr as a cathode catalyst.

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&nbsp;&plusmn;&nbsp;5&nbsp;&mu;Wcm&minus;2

Increase in solution conductivity led to a maximum power of 482&nbsp;&plusmn;&nbsp;5&nbsp;&mu;Wcm&minus;2

No MeSH data available.