Electrochemistry
Pyrolysis-free Fe–PIPhen catalyzes alkaline ORR
Open access · cc by · source: Europe PMC
An Fe2+ coordination polymer of a nitrogen-rich phenanthroline ligand on carbon reduces O2 near 0.85 V with a four-electron pathway.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
XPS also reports how much metal is actually on a molecular or pyrolysed catalyst. A pyrolysis-free Fe–PIPhen on Vulcan XC-72 has 0.748 at% Fe, onset ~0.85 V, average n = 3.94 at 1600 rpm, and H₂O₂ yield 1.6–3.1% (k₁/k₂ = 30–50). A Co–N–C material identified as isolated Co²⁺ in a CoN₄C₈-1-2O₂ motif (XPS with XANES/EXAFS/STEM) gives 97% azo yield and TOF 35.9 h⁻¹ — still without in-operando proof of the hydrogenation cycle.
Evidence for the claim as stated.
Study at a glance
- Design
- Animal / in-vitro — Fe2+–PIPhen coordination polymer on Vulcan carbon with RRDE oxygen-reduction measurements
- N
- RRDE/XPS/XRD catalyst characterization rather than a biological N
- Population
- Alkaline oxygen-reduction electrocatalyst films
- Outcome
- Nitrogen-rich phenanthroline–iron complex reduces O2 near 0.85 V with a four-electron pathway and low H2O2 yield
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Pyrolysis-free Fe–PIPhen catalyzes alkaline ORR
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Average electron-transfer number is 3.94 at 1600 rpm.
the average number of electron transfer number of Fe-PIPhen/C under five different voltages at the speed of 1600 rpm is 3.94, which is comparable to that of the Pt/C catalyst (), indicating the nearly complete reduction of oxygen into water.
Onset reduction potential is about 0.85 V.
The electrochemical results show that the prepared Fe-PIPhen/C catalyst possesses high ORR activity and the onset reduction potential is about 0.85 V, slightly lower than that of the Pt/C catalyst.
Key findings
Onset ~0.85 V; average electron number 3.94 at 1600 rpm; H2O2 yield 1.6–3.1%; k1 ≫ k2 ≈ k3 (k1/k2 = 30–50). XPS: 0.748 at% Fe.
Methodology
Authors condensed phenanthroline-dione with bipyridyl-dialdehyde to PIPhen, coordinated Fe2+, loaded Vulcan XC-72 without pyrolysis, and ran RRDE/XPS/XRD.
Limitations
No PEMFC device data; alkaline-only; Fe loading is low and part of the polymer is microcrystalline.
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