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P4VP makes CoPc a selective CO2-to-CO catalyst
Axial pyridine plus a polyvinylpyridine film together raise CoPc’s CO2-to-CO rate and faradaic efficiency while suppressing hydrogen evolution.
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What does CoPc reduce CO2 to on graphite?
Mainly CO, but free CoPc also makes a lot of H2.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
What polymer boosts CoPc selectivity?
Poly-4-vinylpyridine (P4VP).
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
CoPc-P4VP current, TOF, and FE at −1.25 V vs SCE?
2 mA cm–2, 4.8 s–1, nearly 90% FE_CO.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
How do 2 h average currents compare?
0.62 mA cm–2 (CoPc) versus 2.0 mA cm–2 (CoPc-P4VP).
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
TON for CO after 2 h?
4500 for CoPc versus 34 000 for CoPc-P4VP.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
CO/H2 ratio with P4VP versus free CoPc?
19:1 versus 0.9:1.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
Why use P2VP as a control?
Steric hindrance stops Co–pyridine binding but keeps a similar outer sphere.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
Does P2VP raise CO TOF?
No; it raises FE_CO (73%) by suppressing HER but TON_CO matches CoPc.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
What FE_CO does CoPc(py) reach without polymer?
68%, more than double parent CoPc; TOF_CO 1.6 s–1.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
Must axial ligand and polymer be combined?
Yes; CoPc-P4VP and CoPc(py)-P2VP need both effects.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified
Does extra free pyridine in solution mimic the film?
No; added pyridine or lutidine does not change charge or FEs versus CoPc.
Source: Polymer coordination promotes selective CO<sub>2</sub> reduction by cobalt phthalocyanine · DOI · quote verified