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Pyrolysis-free Fe–PIPhen catalyzes alkaline ORR
An Fe2+ coordination polymer of a nitrogen-rich phenanthroline ligand on carbon reduces O2 near 0.85 V with a four-electron pathway.
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How is PIPhen made?
Condensation of 1,10-phenanthroline-5,6-dione with 2,2′-bipyridyl-5,5′-dialdehyde.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
Is pyrolysis used?
No; Fe-PIPhen is loaded on carbon powder without pyrolysis.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
What onset potential is reported?
About 0.85 V, slightly below Pt/C.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
What average electron number?
3.94 at 1600 rpm over five voltages.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
What H2O2 yields vs Pt/C?
Fe-PIPhen/C 1.6–3.1% vs Pt/C 1.03–2.81%.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
What is the k1/k2 ratio?
30–50, so direct 4e– reduction dominates.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
XPS atomic % of Fe?
0.748% Fe (C 95.27, O 2.39, N 1.58).
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
N 1s components?
398.6 eV pyridinic N, 400.2 eV =N– (imidazole), 401.1 eV graphitic N.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
What XRD extra peak marks the polymer?
A diffraction near 11.9° from microcrystalline Fe-PIPhen.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
Carbon support particle size?
Vulcan XC-72 spheres 35–60 nm; composite 40–60 nm after coating.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified
Ligand condensation conditions?
Reflux 120 °C, 12 h under argon, then ethanol/water wash.
Source: Supramolecular Iron Complex Formed Between Nitrogen Riched Phenanthroline Derivative and Iron With Improved Oxygen Reduction Activity in Alkaline Electrolyte · DOI · quote verified